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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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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Jul 24, 2011
I run a website that a very steady flow of traffic and Im seeing recent issues that I just dont like. Server is 10.04.2 on a supermicro i7-950/6gb RAM with two 500gb Samsung F3 drives in a software RAID1 (1x5400, 1x7200) and for several weeks, its been running very well. Recently, Im seeing the server hang for 5-20 seconds. IOwait goes through the roof, nothing can write to the disk. Apache logs stop, redis fails to rebuild caches, mysql errors and then it continues and moves back to normal operation
/ is ext4, the kernel was 2.6.32-server-x64 but since updating to 2.6.38-server-x64, the issue has dropped from maybe once per 10 minutes to once per 15 minutes. 3 IOstat copy/pastes show this when it hangs.
Code:
Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
[code]...
No smart errors or smart diags show any issues with any of the disks and kernel.log shows near nothing other than a process hang, 120 seconds about 5 days ago.
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Mar 26, 2010
So here it is, I have a fileserver setup on Ubuntu Server 9.10 AMD64. In this system is 4 1.5TB SATAII drives. They are configured in RAID5 using MD. Now everything is working beautify, except when you need to create a directory. When you do, the system hangs for about 30 seconds. The I/O wait in top jumps up as well. Then the directory is created and everything works once again.
The odd part is it is only Directory creation that does this. I can copy, move, download and stream files off the server perfectly. I am baffeled as to what is causing it. It might be related to the fact that I expanded the array from 3 to 4 drives, it was after that, that I first noticed the problem.
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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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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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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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Dec 5, 2010
I'm a light linux user over the last couple of years and I decided to built a HTPC/NAS device.
Setup:
40gb ide -> usb boot drive
3x2tb sata (4k Sector) drives
I've got another 2tb identical drive but it's holding data that is going to be copied to the raid after it's up and running and then be 'grown' into the raid array to yield a final 5+tb array. I tried doing a disk util raid array and it ended up failing after reboot due to it using the /dev/sd* designations and they swapped. I have no idea how to do the UUID version, my googlefu and practical guide to ubuntu. So I decided to do it manually in order to also fix the sector issue as disk util wasn't formatting them correctly and once formatted wouldn't let me create a raid array from the discs.
[Code]....
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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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Apr 30, 2010
I downloaded the x86 server version for Lucid twice today. Both times before burn the md5 match those published on the Ubuntu site. I am attempting to install the system on a Dell poweredge 2500. 2x 1.4 gb P4 procs, 1 gb ram, 750 GB HDD (raid) Boot to installer. it goes through the standard language checks, keyboard, checks for cdrom, then attempts to start copying files.
It gets to 17% copy on fs-core-modules-2.6.32.21-generic-di and hangs there for 5 minutes or so. Then comes back with the error that it could not get the file and asks if I want to retry. all retries lead back to this error. As I said, MD5 is exact, burner does not complain of a bad burn, and disk is closed at the end of the burn. so, has anyone else been able to install Lucid server x86? burned four disks today, one pair on two different burners. All fail at 17% retrieving that file.
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Jan 9, 2010
I have no drive failures but just need to recreate a raid5 set as the next free MD disk number. Originally I built a temp OS of debian on a single drive and had 4x2TB drives in a raid5 software array (MD0) this worked fine and allowed me to move all data to it, and remove our old fileserver. I have now pulled out the 4 x 2TB Raid 5 drives and created a new OS on two new 80GB drives, partioned as follows,
MD0 is now 250mb Raid1 as /boot
MD1 is 4GB Raid1 Swap
MD2 is 76GB Raid1 as /
If I turn off and push back in the 4x2TB drives I cannot see a MD3. I presume I would need to create a MD3 from these 4 drives but I dont want to mess things up as its live data. So im here asking for help, or a bit of hand holding to get it done right.
PS - Its a Debian Lenny 5.0.3 Raid1 fresh install replacing a Debian Lenny 5.0.3 on a single disk.
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Jun 26, 2010
After the updates about a week ago I noticed my system was hanging (screen and mouse frozen, unable to switch desktops, trl+Alt+SysRq+B still reboots) frequently. Though sometimes the system would not hang but become extremely sluggish and unresponsive. I've been able to determine that the problems occur whenever a module is added or removed. I can cause this problem with such commands as:
sudo modprobe aes
sudo rmmod raid0
I've tried multiple kernels but the problem persists. I've run memtest on the system but no errors have been found. I wonder if this could be some other sort of hardware problem but I'm suspicious that this began after a set of updates. I've seen message such as this in the kern.log:
Code:
Jun 25 22:35:48 localhost kernel: [ 240.480059] INFO: task modprobe:2672 blocked for more than 120 seconds.
Jun 25 22:35:48 localhost kernel: [ 240.492925] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 25 22:35:48 localhost kernel: [ 240.506918] modprobe D 00000000ffffffff 0 2672 2650 0x00000004
[code]....
I've tried using strace but that was not helpful. This is becoming a serious problem as I cannot load any encrypted volumes due to the inability to load the aes module. dpkg is currently in an interrupted state as the system hung when upgrading virtualbox-3.2 when it attempted to remove the modules. So my system is barely functional and I cannot see any way to fix things.
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Jun 10, 2011
I am trying to build a new array after adjusting TLER on my disks, which permanently changed some of the drives sizes. I am not sure if the following inconsistencies are related to the newly mismatched drive sizes.
Using:
Code:
mdadm --create --auto=md --verbose --chunk=64 --level=5 --raid-devices=4 /dev/md1 /dev/sdd /dev/sde /dev/sdf /dev/sdg
Nets me (build-time was two full days):
[Code]....
On a side note, since I'm recreating my array from scratch, I was wondering if anyone here knows of any optimized settings I could use. I've got 3Tb of data to transfer, so lots of test material.
These are Western Digital First Generation 2TB Green Drives (WD20EADS-00R6B0) with WDidle3 fix applied & TLER=ON. These are pre Advanced Format (aka not 4K).
Code:
mkfs.ext4 -E stripe-width=48,stride=16 /dev/md1
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Jul 2, 2010
I have a Dell desk top PC, running WinXP and Ubuntu 10.04 LTS with a Ge-Force FX 5200 video card. In trying to get both monitors to work properly I thought it would help to reinstall Nvidia binary X.Org driver V173. After I removed the driver I tried to restart the computer with Umbuntu, it hangs up at the Ubuntu logo. I can boot with the live disk, I also tried to reinstall the Nvidia driver But the machine still will not boot from the hard drive, it will boot into Win XP normally.hould I just reinstall Ubuntu or fix the problem I created? My skills working in Terminal are minimal
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Mar 6, 2011
I wanted to extend my raid array with one disk, but I made a major error. I forgot partition the new disk to utilize the full 640GB. I used the following commands to extend the array:
Code:
mdadm --add /dev/md0 /dev/sdf
mdadm --grow --raid-devices=6 /dev/md0
xfs_growfs /dev/md0
After noticing that something was wrong I used these commands to remove the new disk:
[Code]....
How can I repair this situation? Before starting this adventure I made a back-up of everything that was stored in the raid array.
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Apr 30, 2010
I just installed 10.04 i386 Server(release version)last night on an older IBM workstation (sorry, for the life of me can't remember model and I'm at work now); P4 2.4, 512Mb RAM, generic Intel graphics. This was a base install (aside from OpenSSH) with no window mgr. The HDD was wiped during the install and GRUB2 wrote to the MBR.
The install went smoothly, and on the soft reboot after the install I got a shell and was able to login, etc. and even SSH in.I unplugged the machine, moved it, booted, and got a cursor in the upper-left of the screen for about 3 seconds, and then the monitor would enter power save mode. (I tried 2 different models of monitor). While the cursor was on the screen the HDD access LED was blinking with activity, but that would stop right before the screen would enter standby. Tried a few reboots with the same result.
I'm thinking this is not a video driver issue (as similar threads have suggested),because the splash screen for the install disc renders properly and on the first successful boot the shell rendered appropriately at a high resolution.I can hold down shift to enter the GRUB2 menu, which also renders at a higher-than-text resolution and is defaulted / displays the correct options.
Most other threads with a similar yet non-video issue centered around GRUB2 issues with a dual-boot machine, which mine is not.I did go in via rescue mode (off the install CD -- the rescue option of the GRUB menu has the same result as a standard boot), and checked that my grub.cfg was correct, and I ran grub-install to no avail, and also ran grub-mkconfig on a subsequent boot to no avail, yet the grub.cfg generated appeared identical to the original generated during install.
The partition/file system is default layout.
20 Gb IDE (/dev/sda)
/dev/sda1 /boot ext2
/dev/sda2 Ext
[code]....
I'd be happy to give more info if someone has a troubleshooting direction in which to go.
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Jul 27, 2010
I'm trying to track down a problem with my server. Basically, I can get it to boot with a LiveCD and do rescue stuff with it - I just can no longer get it to boot. I've been slowly working my way through all of the error messages that come up during the boot process, and knocking them off one by one. Right now, they're fairly minor.
I'm trying to find out what the big issue is by looking at the logs. The last thing that it does is bring up apache2, says [OK] and then hangs. I've tried to do ls -lustR on /var/log to see what's the last log touched, and that's syslog or boot.log, but the last entry says something along the lines of Apache2 is up and running.
Where else should I look?
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Sep 1, 2011
The attached log file includes two crashes/reboots within the past day or so I have recently started trying to set up / manage a Linux (Ubuntu 10.04.2 LTS) server in our data center (all other servers are Windows boxes). The server periodically hangs and becomes unresponsive and I'm at a loss to find anything in any log that indicates a specific cause. Sometimes it's up for hours, sometimes days (14 days at longest). Plugging a monitor in to the machine after a hang shows nothing at all. In an effort to troubleshoot the problem we've tried disabling APIC, more out of "educated desperation" than anything else. Unfortunately we are limited in some of the troubleshooting we can do, as we have a single client website hosted on the box (the reason we set it up) so anything that involves significant downtime is a problem.
As this is our first attempt at setting up a linux box, we are using a "well equipped" desktop grade machine but not what I would call "server grade" hardware. This is a standalone box, not a VPS. We are using a hardware, not software, RAID array and have plenty of memory in the box.
Caveats / Background:
I am relatively new to Linux in general. I spend much more time writing code than managing servers. I'm comfortable with working on the box, but I'm not really a sysadmin guy. I'm comfortable with the command line but have more experience with OS X (BSD). I am unsure of all of the tools / information / Logs that may be available, though I try to be thorough in checking what I do know. I did not physically configure the hardware so I'm not sure of all of the specs but I can get any info I need to troubleshoot. I may be skipping very basic steps or missing obvious places to look for information without knowing it.
A little more detail:
Real memory: 8GB
Ubuntu 10.04.2 LTS
Hardware RAID 10
Managing sites with Webmin version 1.550
Server is in a remote data center. Hands on-troubleshooting is difficult. We have attempted two Linux setups at this point. The first was on a hardware config identical to this one, but with no actual pieces of hardware reused. That attempt was using CentOS and we were attempting to set up CPanel. We scrapped that install because of this same problem (periodic crashing / hanging). The second attempt (this one) is showing the same behavior. The only thing I can really see in common are the hardware configuration (though CentOS & Ubuntu may have more in common than I think).
The box will run fine for hours, days, or even weeks, and then just stop responding entirely. I check all of the logs I know to check (primarily messages, syslog and kern.log) but I don't see anything that seems like an error to me. I do see lines that I don't understand that may or may not be problems, such as:
Code:
rsyslogd: [origin software="rsyslogd" swVersion="4.2.0" x-pid="814" x-info="http://www.rsyslog.com"] rsyslogd was HUPed, type 'lightweight'.
Most of our syslog entries seem to be logs of webmin related cron jobs running. My gut tells me that there is possibly some component in our configuration Linux does not like or needs a driver update (maybe the raid card for example), but I'm unsure of how to do more to track down or determine what that might be. Guess and check is expensive. Another thought I've had is that one or more of the cron jobs that are running are tripping something up, but it doesn't appear to be reproducible on demand and, again, I'm at a loss on how to test that theory any further. The same cron job does not appear to be running each time the server goes down. This is a portion the log just prior to our last hang:
Code:
Aug 8 11:00:01 linhost01 CRON[10771]: (www-data) CMD ([ -x /usr/lib/cgi-bin/awstats.pl -a -f /etc/awstats/awstats.conf -a -r /var/log/apache2/access.log ] && /usr/lib/cgi-bin/awstats.pl -config=awstats -update >/dev/null)
[code].....
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Mar 8, 2010
I've tried to type this message twice in detail, but the computer won't submit it. What are the proper steps to take when a SCSI drive fails in a RAID five array running CentOS 5.4?
Yes, I read the manual. On a Dell 6650 system the drive can't be rebuilt because it is not recognized as the correct size. Linux rescue doesn't work... won't find the linux partitions that are still there according to fdisk -l
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Aug 11, 2010
Been trying to upgrade home server for several days and it keeps hanging on the mysql upgrade. Here's the what apt-get says code....
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Apr 15, 2010
Here is what I have and what I want to do.
3 new 1.5TB HD. 1 used 1.5TB hd with 980MB of data. I want to set up a raid 5 with a hot spare. I have music, pictures, videos, and movies (About 2.8TB worth). I have had a mismatch of drives previously, 250GB, 2 320GB, 500GB, 2 1TB and now a 1.5TB all with data. I have removed the one 250 and 2 320s and put the data on the 1.5TB that is currently installed.
What I would like to do is create a raid5 with the three new 1.5TB HD's, copy the data over from the currently installed 1.5TB and then grow or add that drive as a hot spare. Or just add it and then add another 1.5TB down the road as a hot spare don't know for sure.
In addition since I have 2 1 TB drives, I could add 2 more (Good deals on 1 TB drives right now) and have a total of 4 1TB drives. Could I have 2 raid5's (4-1TB's and 4-1.5TB's)in two separate arrays? I really do not know if that makes sense or not but here comes LVM. I am tired of managing my HD space and since i have multiple folders (Movies, music, pictures, videos) and within the movies folder I have R, G & PG folders for the ratings of the movies. (Pwd protect the R so the kids can't get to it) So with LVM installed with the Raid5 I should be able to create my folders and just keep adding data and not worry about moving folders around when I grow the storage by adding new drives. Is that correct? Maybe someone could point me to a how to.
Also, if I create 2 arrays (And I need to know so I can order the 2 additional 1TB drives), then I could put all the music, G and PG content on the one array and all the R and spicy stuff on the other and password protect it.
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Oct 4, 2010
I have been trying to set up an LDAP server for a development environment as part of an internship for a week now, and I cannot get past this point. I have been following the 10.04 server guide to set up LDAP here: URL...Once I get to the following point in the guide, it just hangs:"As an example of modifying the cn=config tree, add another attribute to the index list using ldapmodify:"I've been working on this for a week and can't understand why this won't work. I am fairly certain that I've followed the guide to a 'T.'Any idea why am I receiving a permission denied error? Is this a permissions issue with one of the config files?
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Mar 5, 2010
I recently installed a new home backup server with Ubuntu 9.10 x86_64 using the alternate CD. I used the CD's installer to partition my disk and created a software RAID 5 array on 4 disks with no spares. The root file system is located outside the raid array.
At first the array performed nicely but as it started to fill up, the io performance dropped significantly to the point where I get a transfer rate of 1-2MB/s when writing!
[Code]...
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May 3, 2010
Created my own file server/nas, but get stuck in a problem after couple of months. I have a server with 4x 1,5tb disks, all connected to sata ports and 1 40gb ata133 disk running ubuntu 9.10 x64 amd. I've created a raid5 array using mdadm. It all worked great for couple of months but lately the raid5 array is degraded. disk sdd1 is faulting every few days. I have checked the drive but it is fine. If I re-add the disk and wait for 6 hours my raid5 array is all fine again, but after a few shutdowns, it is degraded.
my mdadm detail:
Quote:
root@ubuntu: sudo mdadm --detail /dev/md0
/dev/md0:
Version : 00.90
Creation Time : Mon Dec 14 13:00:43 2009
Raid Level : raid5
[Code].....
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Nov 2, 2010
I have ubuntu server 10.04 on a server with 2.8ghz 1gb ddr2 with the os on a 2gb cf card attached to the IDE channel and a software raid5 with 4 x 750gb drives. On a samba share using these drives I am only getting around 5 MB/s connected via wireless N at 216mbps and my router and server both having gigabit ports. Is a raid 5 supposed to be that slow? I was seeing speeds of anywhere from 20-50MB/s from other people and am just wondering what i am doing wrong to be so far below that.
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Nov 14, 2010
I do know about cold boot attacks. But I ran across a couple of posts/websites that had me wonder if it is possible, without the passphrase, to just remove the encryption?
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Mar 18, 2010
I've built a server with (intentionally) very low-power components. The motherboard uses a Via C3 CPU running at 700MHz. The server has 512MB of RAM and I'm running 8.04 Server Edition (no GUI). This is purely a file server - not a lot of daemons started (except the defaults) -- no web server, etc. Just NFS, Samba and Open SSH (for remote administration). I'm not sure how much free RAM it has (it's down at the moment).
Is the RAM/CPU going to be inadequate for running software RAID5? I've done some big rsyncs and even without RAID, this thing is pretty slow. I'm not terribly concerned about the write speed, but if the read performance is going to be inadequate for playing (not streaming - just playing) a 720p MKV movie over my LAN, then I need to rethink this.
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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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May 13, 2011
My fileserver initially had 3 1TB drives in RAID 5 configured with mdadm as /dev/md1. (System root is a mirrored raid on /dev/md0) I went to go add a 4th 1TB drive to /dev/md1 and grow the raid 5 accordingly. I was initially following this guide: [URL] but ran into issues on the 3rd and 4th commands. I've been trying a few things to remedy the issue since, but no luck. The drive seems to have been added to /dev/md1 properly, but I can't get the filesystem to resize to 3TB. I also am not entirely sure how /dev/md1p1 got created, but it appears to be the primary partition on the logical device /dev/md1.
Relevent information:
Code:
fdisk -l /dev/md1
Disk /dev/md1: 3000.6 GB, 3000606523392 bytes
2 heads, 4 sectors/track, 732569952 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 65536 bytes / 196608 bytes
Disk identifier: 0xda4939fa .....
The filesystem originated as ext3, I believe its showing up as ext2 in some of these results because I disabled the journal when doing some initial troubleshooting. Not sure what the issue is, but I didn't want to blindly perform operations on the filesystem and risk losing my data.
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Jul 8, 2011
I have software raid 5 array, each time I reboot my server, I have to rebuild array again. Rebuilding array takes too long. I am using ubuntu server 10.10.
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