Ubuntu Servers :: Does Replacing Failed Disk On Raid5 Change Any Data On Other Disks In Raid

Jan 9, 2011

I've got a raid5 array of 4 disks with ubuntu 8.04 runing on it that is currently still working:

/dev/sda
/dev/sdb
/dev/sdc
/dev/sdd

Smartmontools for /dev/sdc tell that there are 9 sectors pending for reallocation:

Code:

197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 9
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 9
And /dev/sdd has increasing number of reallocated sectors (about 1 every couple of minutes):

Code:

5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 1735
/dev/sdc has failed a coulple of times this week (but I have always sucessfully readded it to raid5) . But the increasing number of reallocated sectores on /dev/sdd concerns me even more.

I'm affraid that during removal of /dev/sdd and adding new /devs/sdd disk, raid might fall appart. That's why I would try to do it in Ubuntu Live CD:If the raid falls appart (/dev/sdc fails) during the readding of new /dev/sdd disk, I might still remove the new /dev/sdd and return the previous one and assemble the raid with:

/dev/sda
/dev/sdb
/dev/sdd (old one that was previously removed)

Does assembling Raid in Ubuntu Live and adding new disk for /dev/sdd write anything on /dev/sda, /dev/sdb and /dev/sdc in the process of adding /dev/sdd into raid5?

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Ubuntu Servers :: Replacing A Failed RAID5 Drive?

Dec 7, 2010

As the title says, I have a failed RAID5 hard drive. What's the easiest way I can go by replacing it? I've seen many ways to do this, but I would like to know what other people are saying about this, and see how you would do it.

P.S. This is the one I found. [URL]

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Ubuntu Servers :: Faster Write To Disk And Backup Of Data , Putting Together A Raid5?

May 13, 2011

Here is my brief hardware and software detail in my production environment : AMD Phenom X4 3.4gHZ (Over clock to 4gHZ, 8G of Memory, 1TB 7200rpm Harddrive, Running Ubuntu server 10.10.My web production environment were pieced together 3 weeks ago.Here is my dilemma. started out with less that 40 users and now hitting 4,000 unique users per day.Now I am thinking I need faster write to disk and backup of data so I am thinking about putting together a Raid5.

I preparation for this.I have bought a new motherboard, AMD Phenom X4 3.6, and 2 more 2TB 7200rpm (Currently, I have a 2TB 7200rpm not used much)Been digging around this forum for posts with raid setup but still not sure how to seamlessly moving the some 10Gig of data from my current running prod environment once I have RAID5 installed on this new machine via the LIVE Ubuntu Server CD.

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Ubuntu Servers :: Simulate A Failed Raid Array On A Pair Of 2tb Disks?

Feb 26, 2011

Using a fresh copy of server 10.04 im trying to simulate a failed raid array on a pair of 2tb disks. Here is the procedure i have been following so far:

- Remove the dead disk partitions from each of the raid 1 arrays (substitute the correct md devices and partitions)
- mdadm /dev/md0 -r /dev/sdb2
- mdadm /dev/md1 -r /dev/sdb3

[code]....

I get an error here that sfdisk does not support gpt (guid partition table). I thought sfdisk did support gpt? It says to use parted, but i cant find a command that copies a partition table over from another disk in parted documentation. Any suggestions? I suppose i could make the partitions manually, but im writing a procedure for people who arent that technical and i need it to be simple enough to be run in my absence. manually building the partitions would be too hard for them.

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Ubuntu Servers :: Convert Mdadm 6 Disk Raid5 To 5 Disk Raid5?

Jun 30, 2011

I know you can fail and then remove a drive from a RAID5 array. This leaves the array in a degraded state.

How can you remove a drive and convert the array to just a regular, clean array?

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Ubuntu Servers :: Raid Failed - Missing Physical Disk?

Nov 23, 2010

My raid array has failed. I have two disks /dev/sda and /dev/sdb./dev/sdb has failed and I could not rebuild the array(madm returned that the device is busy) so I rebooted the machine. After that, the whole sdb disk went missing, as it now only shows sda in fdisk -l.Did the disk went totally dead or my raid glitched?

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General :: No Automatic Rebuild Of RAID 5 After Replacing Bad Disk

Dec 12, 2009

I have a 5 disk raid 5 array that is composed of SATA A:0,1; SATA B: 0,1, and SATA C:0, and one of the disks (SATA A:0) recently went bad on me. I have an ICP raid controller that is about 5 years old. I replaced SATA A:0. After rebooting, I went into the controller and verified that it saw the disk in the hard-disk info section...there I noticed that in the "status" section, that the SATA C:0, SATA B:1 disks were listed as being "in array", the SATA A disks were blank, and the SATA B:0 disk was listed as "fragment". When I go into the "repair array" section, the controller tells me that there are no arrays that are in failure, error, or need to be rebuilt.

This puzzles me, as I thought the controller would know that the array needs to be rebuilt after replacing the disk and I don't see a way to initiate a rebuild. If I just let the server boot after replacing the disk, then I get back that there are the correct number of disks in the raid 5 and that it is ready, however, the screen then goes blank and I get a blinking cursor and the system seems to hang. There are no activity lights on any of the drives associated with the raid 5, which makes me think that the system is not rebuilding the array at this point.

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Ubuntu :: MDADM RAID 5 Failed But Disks Are Still Present?

Jun 7, 2010

I just had a whole 2TB Software RAID 5 blow up on me. I rebooted my server, which i hardly ever do and low and behold i loose one of my raid 5 sets. It seems like two of the disks are not showing up properly.. What i mean by that is the OS picks up the disks, but it doesnt see the partitions.

I ran smartct -l on all the drives in question and they're all in good working order.

Is there some sort of repair tool i can use to scan the busted drives (since they're available) to fix any possible errors that might be present.

Here is what the "good" drive looks like when i use sfdisk:

Quote:

sudo sfdisk -l /dev/sda
Disk /dev/sda: 121601 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/sda1 0+ 121600 121601- 976760001 83 Linux
/dev/sda2 0 - 0 0 0 Empty

[Code]....

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General :: 2 Disks Failed Simultaneously On A RAID 5 Array?

Apr 15, 2011

I have a home server running Openfiler 2.3 x64 with 4x1.5TB software RAID 5 array (more details on the hardware and OS later). All was working well for two years until several weeks ago, the array failed with two faulty disks at the same time. Well, those thing could happen, especially if one is using desktop-grade disks instead of enterprise-grade ones (way too expensive for a home server). Since is was most likely a false positive, I've reassembled the array:

Code:

# mdadm --assemble --force /dev/md0 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
mdadm: forcing event count in /dev/sdb1(0) from 110 upto 122
mdadm: forcing event count in /dev/sdc1(1) from 110 upto 122

[code]....

Right. Once is just a coincident but twice in such a sort period of time means that something is wrong. I've reassembled the array and again, all the files were intact. But now was the time to think seriously about backing up my array, so I've ordered a 2TB external disk and in the meantime kept the server off. When I got the external drive, I hooked it up to my Windows desktop, turned on the server and started copying the files. After about 10 minutes two drives failed again. I've reassembled, rebooted and started copying again, but after a few MBs, the copy process reported a problem - the files were unavailable. A few retried and the process resumed, but a few MBs later it had to stop again, for the same reason. Several more stops like those and two disks failed again. Looking at the /var/log/messages file, I found a lot of error like these:

Quote:

Apr 12 22:44:02 NAS kernel: [77047.467686] ata1.00: configured for UDMA/33
Apr 12 22:44:02 NAS kernel: [77047.523714] ata1.01: configured for UDMA/133
Apr 12 22:44:02 NAS kernel: [77047.523727] ata1: EH complete

[code]....

The motherboard is Gigabyte GA-G31M-ES2L based on Intel's G31 chipset, the 4 disks are Seagate 7200.11 (with a version of a firmware that doesn't cause frequent data corruption).

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Ubuntu Servers :: RAID5 Failed - MDADM (Device Or Resource Busy)

Feb 2, 2010

Something weird happened last night and my raid5 failed. I am trying to re activate it and see if my data is dead or what. When I run mdadm -Asv /dev/md0 I get

Code:
mdadm: looking for devices for /dev/md0
mdadm: cannot open device /dev/dm-1: Device or resource busy
mdadm: /dev/dm-1 has wrong uuid.
mdadm: cannot open device /dev/dm-0: Device or resource busy
mdadm: /dev/dm-0 has wrong uuid.
mdadm: cannot open device /dev/sde2: Device or resource busy
mdadm: /dev/sde2 has wrong uuid.
mdadm: cannot open device /dev/sde1: Device or resource busy
mdadm: /dev/sde1 has wrong uuid.
mdadm: cannot open device /dev/sde: Device or resource busy
mdadm: /dev/sde has wrong uuid.
mdadm: cannot open device /dev/sdd: Device or resource busy
mdadm: /dev/sdd has wrong uuid.
mdadm: cannot open device /dev/sdc: Device or resource busy
mdadm: /dev/sdc has wrong uuid.
mdadm: cannot open device /dev/sdb: Device or resource busy
mdadm: /dev/sdb has wrong uuid.
mdadm: cannot open device /dev/sda: Device or resource busy
mdadm: /dev/sda has wrong uuid.

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Ubuntu Servers :: 10.04 Server Hangs When RAID5 Disk Is Removed

Jul 20, 2010

I've got a new Ubuntu 10.04 server install with a new 3 disk RAID 5. The boot disk is separate, not part of the RAID. I was trying to practice what I would do if a disk died to recover the RAID, so I unplugged one of the three disks. The machine now just hangs on startup. It shows fsck at the top of the screen but doesn't got anywhere from there. If you press a key it shows the Ubuntu splash screen. If I plug the disk back in, everything boots up normally. So, my question is, how do I get the machine to boot with one of the RAID members missing? I know I can recover it using the Live CD, but it would be nice to be able to get back into the machine without the CD.

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Ubuntu Servers :: OS Drive /dev/sda Changed Labels With Raid5 Disk /dev/sdc?

Jun 25, 2011

My original config:

**Partition/Drive info**

/dev/sda Boot----------> 298.09 GB Hitachi HDT72503
20GB /
16GB /swap
50GB /var

[code]....

1. For some odd reason I tried connecting to a samba share as I had it setup and I could not.

2. Looked at webmin and it said my whole /dev/md0 RAID5 was being used..about 7.8TBs. decided to check my RAID5 setup and drives and noticed

**NEW Partition/Drive info**

/dev/sda Raid Array 1 1.82 TB SAMSUNG HD204UI
/dev/sdb Raid Array 1 1.82 TB SAMSUNG HD204UI
/dev/sdc1 /

[code]....

I didn't connect any new drives or anything. I had checked my "mdadm.conf" and "fstab" and everything looked the same?

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Ubuntu Servers :: Create A New Mdadm RAID 5 Device /dev/md0 Across Three Disks?

Feb 5, 2011

I am trying to create a new mdadm RAID 5 device /dev/md0 across three disks where such an array previously existed, but whenever I do it never recovers properly and tells me that I have a faulty spare in my array. More-specific details below. I recently installed Ubuntu Server 10.10 on a new box with the intent of using it as a NAS sorta-thing. I have 3 HDDs (2 TB each) and was hoping to use most of the available disk space as a RAID5 mdadm device (which gives me a bit less than 4TB.)

I configured /dev/md0 during OS installation across three partitions on the three disks - /dev/sda5, /dev/sdb5 and /dev/sdc5, which are all identical sizes. The OS, swap partition etc. are all on /dev/sda. Everything worked fine, and I was able to format the device as ext4 and mount it. Good so far.

Then I thought I should simulate a failure before I started keeping important stuff on the RAID array - no point having RAID 5 if it doesn't provide some redundancy that I actually know how to use, right? So I unplugged one of my drives, booted up, and was able to mount the device in a degraded state; test data I had put on there was still fine. Great. My trouble began when I plugged the third drive back in and re-booted. I re-added the removed drive to /dev/md0 and recovery began; things would look something like this:

Code:
user@guybrush:~$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sdc5[3] sdb5[1] sda5[0]
3779096448 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]

[Code]...

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Ubuntu Servers :: HW RAID Disk Shows Up In Fstab But Not In /dev/disk/by-uuid?

Jun 28, 2010

I have an SiI hardware SATA RAID card, with two 500GB disks in mirrored RAID configuration. When I first plugged them in and set it up, things seemed to work ok, but on boot the raid controller told me that the RAID needed rebuilding, and it would happen automatically after POST. So I didn't worry about it, and the drive mounted fine, and it's been that way for years. I just went in and manually on-line rebuilt the RAID in the controller's BIOS, and now when I boot into Ubuntu, both disks show up in fdisk, but neither show up in /dev/disk/by-uuid. Am I missing something?

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Hardware :: Access Data On NTFS Disk (RAID 5)

Mar 14, 2010

I am trying to access data that is on a Raid 5 array in Ubuntu... There are 4 installed disks (250gig disks) - 3 of which are setup as a Raid 5 array (the 4th is active but unused). These show up as one large drive (498gig). I have had an issue with the drive where it is no longer allowing Windows to boot - I receive a disk read error on boot (so the OS does not load, obviously!) - what happened was basically I unplugged then replugged in one of the disks which affected the array... I physically reconnected everything as it was, I then had to 'reactivate' the disk in the Raid BIOS... at that point the array seemed OK, was the right size, etc (and was listed as "Optimal" in the Raid BIOS) however, the problem with the disk read error persists.

I have started the machine using Ubuntu v9.10 from a CD (non-destructive mode) and it shows a disk of the right size (ie: on the desktop and in Nautilus it says "498gig Filesystem" ). However, in Nautilus, the disk appears empty with no folders or files on it (even with hidden files shown).... If I view 'Information" for the disk it shows 67gig used space and 399gig free space (which is correct). Also, if I view the disk in Gparted, it shows a disk with about 67gig of used space and 399 free space on a 464gig disk (with 8gig unallocated). One more thing.... when I try the command 'sudo dmraid -tay' it says that there is no raid disk (there are in fact, no drives plugged into IDE or SATA slots - all disk are plugged into the RAID controller card). Anyway, at this stage, I just want to copy the data to a single hard disk if possible and move on.

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Ubuntu Installation :: Upgrade To 9.10 Failed; Can't Boot And Have Encrypted RAID Disk?

Feb 23, 2010

I was running Ubuntu 9.04 Desktop on a headless Pentium 4 machine which is our file, mail, web & fax server. The two x 250GB SATA hard disks were in a RAID 1 array with full disk encryption. Ran the 9.10 upgrade via WEBMIN and it failed. I should have known then to copy over everything to a backup disk, but instead I rebooted.

On restart the machine accepted my encryption passphrase but promptly hung with a mountall symbol lookup error - code 127. So I can't start the machine to get at the disks, and using a Live CD is useless as it has no way to open the RAID array to get at the encrypted partitions. Although we have data backed up (as at last night) I'd hoped not to have to rebuild the entire server from scratch. But its looking bad.I have taken one drive out and plugged it into another machine (Hercules), and the partitions show up as /dev/sdb1 /dev/sdb2 /dev/sdb3.

If it weren't for RAID, I could open /dev/sdb2 the main partition) in Disk Utility and enter my encryption passphrase to get access. But RAID adds a layer of obstruction that I have not yet overcome. I used mdadm to scan the above partitions and created the /etc/mdadm.conf file, which I edited to show the 2nd drive as missing (rather than risk corrupting both drives). I activated the RAID array with mdadm, and cat shows:

Code:
root@HERCULES# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdb3[0]
1815232 blocks [2/1] [U_]

[Code]...

I've been searching the web for hours but have yet to find someone with a solution to this situation. If anyone has a thought on how to access this disk I'd be pleased to hear from you. In the meantime I will start building a new (9.10) machine from scratch, without RAID, 'cos that's probably going to be necessary.

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General :: Scsi RAID Jbod And Arrays - Disk Utilization And The Corresponding Low Data Transfer

Jul 6, 2010

So I have a system that is about 6 years old running Redhat 7.2 that is supporting a very old app that cannot be replaced at the moment. The jbod has 7 Raid1 arrays in it, 6 of which are for database storage and another for the OS storage. We've recently run into some bad slowdowns and drive failures causing nearly a week in downtime. Apparently none of the people involved, including the so-called hardware experts could really shed any light on the matter. Out of curiosity I ran iostat one day for a while and saw numbers similar to below:

[Code]...

Some of these kinda weird me out, especially the disk utilization and the corresponding low data transfer. I'm not a disk IO expert so if there are any gurus out there willing to help explain what it is I'm seeing here. As a side note, the system is back up and running it just runs sluggish and neither the database folks nor the hardware guys can make heads or tails of it. Ive sent them the same graphs from iostat but so far no response.

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Ubuntu Servers :: RAID Arrays Rebuild The Data On The New Drive?

Jun 5, 2010

I have never preformed a rebuild of an RAID array. I am collecting resources, which details how to build an RAID 5 array when one drive has failed. Does the BIOS on the RAID controller card start to rebuild the data on the new drive once it is installed?

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CentOS 5 Hardware :: Disks Switched Place In 2 Different RAID5 Arrays?

Feb 21, 2011

We have CentOS on an HP proliant g5 server and attached to it is an DAS with 3 branches of disks so 5 - 5 - 5 drives.Now what we had so far there is that every branch was on raid 5 and totaling 3 mounted drives each with 4TB (disks are 1Tb each).But a couple days ago something happened while i was replacing older drives with some bad sectors with new one. What I did is to remove old drive, put in new one, initialize and attach to array and rebuild starts.Now somehow 2 drievs ( as i was rebuilding 2 arrays at once) switched place.so disk on 1_1_5 and disk on 1_3_5 switched place. There coul dbe possibility that I made mistake and assigned them to different arrays when initializing but that is really hardly as i replaced one then later another so...

Anyway to the to the point.Is there painless option to remove 1 disk from array and then assign it to other array and then let raid rebuild everything normally?I;ve made backup of everything there so there is no fear of loosing anything...By the way at the same time when that switch happens a partition from 1 raid array completely dis speared and there is only unallocated space on that one right now.

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Ubuntu Servers :: RAID Won't Assemble: Failed To Add /dev/sda To /dev/md0: Invalid Argument

Jul 3, 2010

My hard drives kept dropping out of the raid array, so I finally identified the problem as a bad sata cable. I redid the wires and now when I try to assemble I get this:

Code:

mdadm -v --assemble --scan /dev/md0
mdadm: looking for devices for /dev/md0
mdadm: no recogniseable superblock on /dev/sde4

[code].....

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Ubuntu Servers :: Recovering A Three Disk Software RAID 5

Mar 12, 2011

I'm testing my ability to recover a failed disk on a three disk software RAID 5 setup.

I have used a 10.04 alternate install disk to setup a three disk RAID 5 array according to this: [URL]. This is for a RAID1 setup. I followed it exactly except that I performed the steps on three drives rather than two and selected RAID5 instead of RAID1. Each disk is 500GB and has a 26 GB swap partition and the remaining space on each disk set as / with the boot flag on.

I installed the OS on my array and everything boots without a problem. After I booted up I started a terminal and ransudo dpkg-reconfigure mdadm to set the boot degraded to true and rebooted.

Next, I shut down the computer, disconnected the power on drive 1 (sdb) and then tried to boot. I get this (not verbatim):

Quote:

mdadm: CREATE user root not found
mdadm: CREATE group disk not found
raid5: raid level 5 set md0 active with 2 out of 3 devices, algorithm 2
mdadm: /dev/md0 has been started with 2 drives (out of 3)

[Code].....

*then a list of common problems and then:

ALERT! /dev/disk/by-uuid/bunchanumbersnad letters does not exist. Dropping to a shell

Then it dumps me to initramfs. MD0 is the swap partition. At this point I don't know what the heck to do. I'm skating on the edge of noobidity and this is pretty much over my head.

I want to use this server as a virtual machine server and the desired behavior would be that, if a hard drive should fail, the server would alert me via email and continue to run in a degraded state.

Is it even possible to install the OS on the array and run it degraded? Given the desired behavior, should I be looking at something other than RAID5? My client is broke so I'm trying to avoid a hardware RAID if I can do it.

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Debian :: Disk Health Warning - Disk Part Of RAID5 Array

Feb 17, 2016

I received the following error when I got home from work today. If this was a windows environment, my first inclination would be to boot off my dvd and then run a chkdsk on the drive to flag any bad sectors that might exist. But there's a complication for me.

Code: Select allThis message was generated by the smartd daemon running on:
   host name:  LinuxDesktop
   DNS domain: [Empty]

The following warning/error was logged by the smartd daemon:
Device: /dev/sdc [SAT], 1 Currently unreadable (pending) sectors
Device info:
WDC WD5000AAKS-65V0A0, S/N:WD-WCAWF2422464, WWN:5-0014ee-157c5db9a, FW:05.01D05, 500 GB
For details see host's SYSLOG.

You can also use the smartctl utility for further investigation.The original message about this issue was sent at Sun Feb 14 13:43:17 2016 MST.Another message will be sent in 24 hours if the problem persists.

From gnome-disks
Code: Select allDisk is OK, 418 bad sectors (28° C / 82° F)

I did a bit of reading and it seems that most people suggest using badblocks to first get a list of badblocks from the drive and save it to a file. Then use e2fsck to then mark the blocks listed in the badblocks file as bad on the hard drive. My problem here is that this drive is part of a RAID5 array that hosts my OS. I wanted to confirm if this was still the correct process.I boot to my Live Debian disk, stop the raid array if it's active. Then run badblocks + e2fsck commands on the drive in question and then reboot.

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Ubuntu Servers :: Reassembling Raid 5 With Missing Disk - No Superblock?

Apr 14, 2010

One of my raid disks (was a software raid5 with 4 drives) failured. I wanted to buy a new 1.5TB harddisk anyway so i i copied all the Raid data onto the new disk and disconnected the old ones. But then the new Disc crashed right before i could mirror it with another 1.5TB disk. So i need to reassemble my old Raid 5 now. I connected the drives in the former order except the first one, because this was the failed disk. The problem is, mdadm can't find the raid, no superblocks. Fdisk doesnt show mdraid superblocks, too. But fdisk has never showed superblocks. The thing is, this raid was crypted, but i crypted the /dev/md0, so this doesn't affect anything here, or?

some infos:

Code:

server:~# mdadm --misc -d /dev/sda
mdadm: option -d not valid in misc mode
server:~# mdadm --misc -t /dev/sda

[code]....

Disk /dev/sdc doesn't contain a valid partition table But fdisk always said there is no valid partition table and the raid was working.

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Ubuntu Servers :: Start The RAID Using "Disk Utility?

May 5, 2011

My system locked up while copying files last night. My RAID array will not start. I did verify my UUID's. (Lesson learned.) I do not understand a few things.1. Why do different drives show "active sync" on different drives? 2. Why does "Disk Utility" tell me the RAID is not running and when I try to assemble the RAID, mdadm returns: mdadm: device /dev/md0 already active - cannot assemble itWhen I try to start the RAID using "Disk Utility":

Code:
Error assembling array: mdadm exited with exit code 1: mdadm: cannot open device /dev/sdd1: Device or resource busy
mdadm: /dev/sdd1 has no superblock - assembly aborted
So, I examine sdd1:
Code:
sudo mdadm -E /dev/sdd1

[Code]...

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Fedora Servers :: RAID 6-like Setup With Dissimilar Disk Sizes?

Jun 7, 2010

I'm looking to set up a bit of a home server, and am wondering about storage. What I'd like is something like RAID 6, which has good redundancy built-in, but with this being a home server, I'd prefer to start a little smaller and leave room to build it up in future. I'd been looking at commercial products like the 'drobo', which seems fairly ideal, but I'd really like to see if I can do it myself. I understand that throwing the RAID into an LVM will allow for some expansion, but the last time I checked, most RAID setups called for the same sized disks, or at least limited the array by the size of the smallest disk present.

What I'd like is the ability to build a basic framework with a few cheap disks, and then as things start filling up, to be able to add larger ones (perhaps eventually pulling out smaller ones as though they'd failed and replacing them with big ones)

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Ubuntu :: Replacing With Larger Drives In RAID 6?

Jun 14, 2011

I have a RAID 6 built on 6x 250GB HDDs w/EXT4. I will be upgrading the RAID to 4 2TB HDDs.

How would one go about this? What commands would need to be ran? I'm thinking about replacing the drives 1 at a time and letting it do the rebuild, but I know that would take a lot of time (which is fine). I don't have enough SATA ports to setup the new RAID and copy things over.

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Ubuntu Servers :: Nullmailer Smtp: Failed: 535 Incorrect Authentication Data?

May 19, 2010

I installed nullmailer on our server so we can push mails out using an external mail server.However getting the following messages in syslog

Code:
May 19 22:55:04 <hostname> nullmailer[12435]: Rescanning queue.
May 19 22:55:04 <hostname> nullmailer[12435]: Starting delivery: protocol: smtp host:

[code]....

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Ubuntu Servers :: Hard Disk Filling Up \ Mount /var/log/data To New HDD?

Mar 16, 2011

I have a directory /var/log/data its about 80 GB,It filling up quit rapidly.I don't have much space left in the system them So i will attaching another External HDD.My question is that i need to mount /var/log/data to new HDD.So i have old data and pulse new coming up.I don't want to copy data from /var/log/data then mount new HDD to /var/log/data you know what i am taking about is there a simple way like linking or any other.

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Ubuntu Servers :: RAID-5 Recovery (spare/active) / Degraded And Can't Create Raid ,auto Stop Raid [md1]?

Feb 1, 2011

Could any RAID gurus kindly assist me on the following RAID-5 issue?I have an mdadm-created RAID5 array consisting of 4 discs. One of the discs was dropping out, so I decided to replace it. Somehow, this went terribly wrong and I succeeded in marking two of the drives as faulty, and the re-adding them as spare.

Now the array is (logically) no longer able to start:

mdadm: Not enough devices to start the array.Degraded and can't create RAID ,auto stop RAID [md1]

I was able to examine the disks though:

Code:
root@127.0.0.1:/etc# mdadm --examine /dev/sdb2
/dev/sdb2:
Magic : a92b4efc
Version : 00.90.00
code....

Code:
mdadm --create --assume-clean --level=5 --raid-devices=4 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2
As I don't want to ruin the maybe small chance I have left to rescue my data, I would like to hear the input of this wise community.

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Ubuntu Servers :: Software Raid 5 Migration With A File System Change?

Jan 26, 2010

Everything is software raid using mdadm
3x320GB HDDs in raid 5
1x1.5TB HDDs in raid 1(don't ask)

The above are LVMed to create ~2TB of combined space using reiserFS. I'm not really happy with the performance so I'm moving to XFS while I'm at it.

I FINALLY got around to ordering 2 more 1.5TB HDDs. The end goal is.3x1.5TB HDD in raid 5 formatted to XFS for a total of around ~2.7GB of space.

1. Create raid 5 array using the new 2x1.5TB HDDs.(yes, very pointless at the moment, please continue reading)

2. Copy data from 2TB LVM to the new ~2.7TB raid 5. (will mdadm let me be an idiot? It apparently let me force create a single drive in a raid 1)

3. Move the original 1.5TB over to the new raid 5 to actually provide redundancy.

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