Ubuntu Servers :: Hardware Requirements For (software) RAID5?

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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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 :: Create A Raid5 With The Three New 1.5TB HD's?

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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Ubuntu Servers :: Software Raid5 - Very Low Performance?

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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Ubuntu Servers :: Mdadm Raid5 Keeps Degrading?

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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Ubuntu Servers :: Slow Raid5 Using Mdadm?

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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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 :: Growing Software RAID5 With MDADM

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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Ubuntu Servers :: Rebuild Raid5 Array After Every Restart?

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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Ubuntu Servers :: 10.04 LTS Degraded Software RAID5 Array With LVM Won't Boot?

Jul 5, 2010

I also get sent to a Busybox (initramfs) shell with no text editor and don't know how to copy all the error messages and post them here. If there is a way, let me know. I've typed it out in the meantime:

Code:
md0 : inactive sdxxxx
Attempting to start the RAID in degraded mode...
mdadm: CREATE user root not found
mdadm: CREATE group disk not found

[Code].....

This is with a 3 disk RAID5 array. I turned off the system, pulled out a drive, and started it back up. Fresh install, all I've done so far is apt-get update and upgrade.

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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 :: 10.04 Server RAID5 LVM Failing After Reboot Due To It Using The /dev/sd* Designations

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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Ubuntu Servers :: RAID5 - Re-adding Drive As Active, Not Spare?

Jan 13, 2011

I have a little nice Ubuntu server with 6x 1TB drives assebmbled into a RAID5 array. Recently SATA cable of one of the drives failed. So I ordered a new cable and ran the server in degraded mode for a few days. Like this:

Code:
/dev/md0:
Version : 00.90
Creation Time : Sat Sep 19 10:39:11 2009
Raid Level : raid5
Array Size : 4883812480 (4657.57 GiB 5001.02 GB)
code....

I'd like the 6th drive to be active, not spare, like before. Should I just wait for rebuild to be finished (it can easily take over 1 day)? Or should I add it somehow differently to be active immediately?

I'm not sure, but I think as I simulated failures unplugging one of the disk, after plugging it in again, the "failed" drive was active again and rebuilding was started as well of course. But it was 2 years ago, so...

The array works just fine for now - I can access files, etc. But I suspect, that in this state if another cable or drive fails, it won't survive anymore. Even after rebuilding is finished, but the 6th drive stays is still marked as "spare". Right?

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Ubuntu Servers :: RAID5 Setup To Serve 10 Client Machines?

May 22, 2011

I am trying to build a file server with RAID 5 over a couple of 1TB HDDs, to serve about 10 client machines using Ubuntu Server. I already own a 22-port switch: HP ProCurve v1810G-24 Switch (J9450A), which I am assuming will do the job. And for the actual server I am thinking of buying: HP ProLiant DL120 1U. Will this hardware suffice, or am I missing something important to get the whole thing running?

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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 :: 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 :: Raid5 Repair Partition Table - Recognized Too Late

Feb 27, 2011

I opened GParted to create a new partition on a new drive. He wanted me to create a partition table first which I did, and it was created directly without any prompt like im used to see when creating partition. So I recognized too late, that i actually created a MBR on one of my 6 1TB raid5 drives. Not beeing sure if the ne MBR was really written, I have opened ubuntu disk utility and clicked on the check raid button. It directly made a resync. After the resync, mdadm --detail /dev/md0 told me everything is ok and synced. Then I wanted to mount it with:

mount /dev/md0 /mnt Then I get the following error: "mount: wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so" I think I just killed my raid5 ;(

I shouldnt work on my server when im tired and when I actually have no time ;( My last hope is the fact, that "Disk Utility" shows that there is a .0 TB ext4 volume on my raid (see screen below) [URL]

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Ubuntu Servers :: Mdadm RAID5 Vs. 4x4 LVM Striped In Worse Case Scenarios?

Mar 12, 2011

I'm trying to find out which one is safer when it comes down to recovery process in case of a drive failure

A RAID5 created in mdadm
or
a Stripe RAID created on pure LVM

the RAID is purely for data storage for a SAMBA server, the OS will reside on its own drive.Ideally the RAID physical hard drives should be re-build on another machine in case of catastrophic server failure (mother board problem, or any other random problems as an example)I can't decide which of the 2 software RAID method is more convenient and safest, don't care about performance, it'll be a dedicated server for mass storage, it's going to mirror other 3 file servers on fakeRAIDs (dmraid), it's simply a redundant backup for the backups

The important goal here is portability.from what've read it appears that LVM might be more portable?but according to some dated (2009) info the mdadm seems to be a bit buggy when it comes to rebuilding the array, yet LVM doesn't appear that safe either which one would you pick for ease to rebuild on catastrophic failures?

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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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Fedora Servers :: FC10:Raid5 Fails After Grow Operation

May 7, 2009

Here's the deal: I had a nice little fileserver running under 2.6.27.21-170.2.56.fc10.x86_64.

3 disks in raid 5 ext4fs, then I thought..."hey I'm a greedy bastard..I want another drive!!

So I get it..do a normal mdadm --grow...after around 1100 minutes .. FINISHED!..whee..happy...

I decide to do a upgrade to 2.6.29.2-52.fc10.x86_64 to get the fix for growing the ext4..

reboot...

Code:
md: bind<sda3>
md: sdc3 has same UUID but different superblock to sda3
md: sdc3 has different UUID to sda3
md: export_rdev(sdc3)
md: sdd3 has same UUID but different superblock to sda3

[Code]....

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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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Server :: Recreate A Raid5 MD0 Into A Raid5 MD3?

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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Ubuntu :: What Are The System Requirements For 10.10

Feb 27, 2011

I Was Just Wondering What The System Requierments for Ubuntu 10.10 are Because i am interested in installing it on a 500 MHz 256 MB Ram Gateway Pentium 3 Will it work?

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Ubuntu Installation :: 10.4 Or 9.10 Hardware Requirements?

May 4, 2010

I have been trying to install 9.10 on a 2007 Satellite Laptop, L35, 512MB RAM, 60GB HD, Intel Centrino.The CD drive is damaged so I booted from an USB, in the live session and in the installing process the computer freezes. I finally tryed installing ubuntu using the whole HD, deleting Windows XP, I hoped this would help Ubuntu's performance... failure.

What are the hardware requirements for 10.4? Should I try an older version of Ubuntu? Should I try a different Distribution?

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Ubuntu :: Windows 98-like System Requirements?

Oct 19, 2010

I have a Windows 98 computer I would like to run a linux distribution on. Note: It has 333Mhz and 64MB of RAM. Currently (using the KernelEx program), I can run the latest Firefox w/ latest Flash and use Microsoft Word 97 and Excel 97. Are there any options in the Linux world that can match what Windows 98 gives me with my system specs?

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Ubuntu :: 10.10 - Any Way To Change Wake Up Requirements

Feb 10, 2011

I'm running Ubuntu 10.10. Is there a way to eliminate, or at least change the length of time, of having to enter your password after the screen timesout from no activity? I've looked all though Preferences but have not found anything that seems to address this.

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Ubuntu Installation :: PC Requirements For Server 11.04

Jul 13, 2011

I'm using Intel atom 1.8 Ghz, RAM 4GB, but it took 12 hours to install ubuntu server 11.04. Can U guys tell me PC requirements to install it?

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Ubuntu :: Requirements For Setting WiFi On Desktop

May 17, 2010

I plan to bye a router for my desktop PC. I will plan to use many hotspots in my location. I don't have much experience with this equipment, and I need router or just small WiFi card.

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Ubuntu :: Running Really Slow With Sys Requirements Perfect?

Jul 27, 2010

my ubuntu laptop is running very slowly, it was running fine until I rebooted it then it has stayed really slow. It takes 7minutes to boot and crashes alot, most of the time it takes a good 3 mins to open anything,

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Ubuntu :: System Requirements For 10.04 - Speed Up Performance?

Mar 6, 2011

I have an older PC running Ubuntu 10.04, and the system is slow, especially with Firefox running. I recently upgraded to 2 gig memory, but it didn't help. I have plenty of space on my hard-drive, using only 30 gig of 80 gig. My CPU is Intel Celeron 2.40GHz. I have broadband, and the speed seems good. What are the system requirements for Ubuntu 10.04? Any tips for speeding performance, esp on Firefox? I used to do a defrag when I had Windows; is there any need to do that on Ubuntu also?

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