Ubuntu Servers :: Mounting Existing RAID Array On Fresh Installation?
Aug 1, 2011
I'm running 10.04 x86 server with a really simple installation on a single 250GB boot disk. I then have a RAID5 array as /dev/md0 (set up using mdadm with x4 2TB disks). All is working well. My mdadm.conf file looks like this
Code:
# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
[code]....
if I was to lose the boot disk and need to remount the RAID array on a fresh installation, what steps do I need to go through. My assumption is that the superblocks on the RAID disks will be used and I don't need to keep any additional information - is this right?
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Jun 6, 2011
I have an ubuntu 10.04 machine that I use primarily as a file server. I have a RAID5 array built with mdadm from 3 component disks that worked properly until a recent upgrade (I'm not sure exactly what broke it though). The array is /dev/md0 and is set to mount at /var/media on bootup. *Now*, when the system cold boots it hangs partway through the bootup sequence and throws the following error:
The disk drive for /var/media is not ready yet Press S to skip ... Once I "S"kip this manually, I can see that LOWER in the boot sequence mdadm gets called and assembles the drive, and once fully booted into the system I can then simply do a "mount -a" and the array mounts properly. SO... my gut feeling is that some portion of one of the upgrades changed the order in which things are called, and now the "mdadm assemble" is not triggered until AFTER the system tries to mount the drives. My problem is that I don't know the stuff that controls the boot sequence well enough to dig in the right place.
As a workaround I can remove that entry from /etc/fstab, but then (of course) the system won't auto-mount the array. It's better than the boot process completely hanging because as least THIS I can fix remotely, but I'd really like to know
1) why this broke in an upgrade and is it a known problem?
2) how to get it back to where it auto-assembles and then auto-mounts the array on bootup.
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Feb 16, 2010
I have a large RAID array of 12 TB attached to one of my Ubuntu server machines. The RAID volume is formatted with NTFS. The problem is that I can not mount this volume in Ubuntu. I can read it normally if I attach it to windows machine.This is the output from "sudo fdisk -l":
sudo fdisk -l
Disk /dev/sda: 164.7 GB, 164696555520 bytes
255 heads, 63 sectors/track, 20023 cylinders[code]........
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Aug 1, 2010
I had done a new lucid install to a 1 TB RAID 1 array using the alternate CD a few weeks back. I messed up that system trying to some hardware working that lucid doesn't have drivers for yet, so I gave up on it and reinstalled to a single 80 GB disk that I now want to move over to the RAID array.
I moved all of the existing files on the array to a single folder, then copied all of the folders from the 80 GB disk over to the array with permissions and symlinks (minus the contents of /proc and /sys, which I created empty).
These are the commands I used:
Quote:
p -a -d -R -v -t /media/raid_array /b*
cp -a -d -R -v -t /media/raid_array /d*
cp -a -d -R -v -t /media/raid_array /e*
cp -a -d -R -v -t /media/raid_array /h*
[Code]....
I tried to change fstab to use the 689a... for root, but when I try to boot, it's still trying to open /dev/disk/by-uuid/412d...
So then I booted from the single disk again and chrooted into the array, then ran update-initramfs -u. I got 3 "grep: /proc/modules: No such file or directory" errors, and "cat: /proc/cmdline: No such file or directory"- so I created directory /proc/modules, created an empty file /proc/cmdline, and ran the initramfs update again. Then I tried to shut down, which hung (probably because I was doing all of this from a terminal window in Gnome), so I killed the power after a couple of minutes.
It's still trying to use /dev/disk/by-uuid/412d... to boot.
What am I missing? I assume I just have to change the UUID to mount as root, but I don't know how.
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Sep 27, 2010
I have a NETGEAR ReadyNAS NV+ with four 1TB drives in a RAID-5 array. This is our primary file storage. This has previously been backed up to a hardware RAID-0 array directly attached to our Windows server. The capacity of this backup array is no longer sufficient. So the plan was, take a bunch of 200GB to 320GB drives (And a 750) I had kicking around, chuck them in a couple of old SCSI drive enclosures I have collecting dust, attach them via IDA/SATA-to-USB adaptors to a USB hub, attach that to the server, create a JBOD array spanning the disks, and back up the NAS to that. Performance is not an issue as this is just to be used for backup, with the idea being as near to zero cost as possible (Spend so far = NZ$100�ish).
The first hurdle I struck was Windows not supporting Dynamic Disks on USB drives (Required to create a spanned volume). At first I resisted using another machine (i.e. a machine running Ubuntu) as I didn't want to dedicate a piece of hardware to backing up the NAS. I then decided it would be acceptable to do this via a VM, which is what I've done.So I have 10.04 running under VMWare Server 2.0.2 under Windows Server 2008 R2. The disks are all presented to the VM. I wasn't sure if I was going to end up creating the array under LVM or something else, but I noticed Disk Utility has an option to create an array, so I tried that. When I add two 250GB drives, the array size is 500GB. When I then add a 160GB drive, the array size drops to 480GB. Huh? If I keep adding disks (Regardless of order) the final array size comes out at 1.8 TB, as per the attached screenshot. Now with the following drives, I expected something more like:
160 + 250 + 250+ 750 + 250 +200 + 200 + 250 + 320 + 250 + 320 = 3.2TB
Am I missing something or making a false assumption somewhere?
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Sep 23, 2011
I have a home samba server with a 3ware Escalade 8506-8. I have 5 x 500 gig hard drives in a RAID 5 array. Recently, my 8506 died and I need to get a new one. However, I saw a 3ware Escalade 9500S-12 on ebay for about $20.00 dollars more than a replacement 8506-8.
My question is, if I put my drives on the 9500S, will it recognize my existing RAID array? Or will it want to build a new RAID array and format all of my data?Hope I have asked this question clearly, little short on sleep this week.
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May 11, 2011
Round two:I am trying to install a RAID 1 array on my system. I already have another RAID 1 array in there. I am using the BIOS RAID option to set up the array.Here's what dmraid -r tells me:
# dmraid -r
/dev/sda: pdc, "pdc_bajfedfacg", mirror, ok, 3906249984 sectors, data@ 0
/dev/sdb: pdc, "pdc_bajfedfacg", mirror, ok, 3906249984 sectors, data@ 0
[code]....
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Jun 23, 2009
I need to mount my raid array on CentOS 5.2 samba server.
Here are my hardware specs:
Motherboard: Tyan S2510 LE dual PIII
CPU's: Intel PIII 850ghz socket 370
Memory: 4 gig Crucial 133 ECC SDRAM
OS: 2 x'x IBM Travelstar 6.4 gig 2.5 hard drives, (low heat/noise)
Storage: 4 x's Seagate 500 gig IDE 7200 rpm
RAID controller: 3Ware 7500-12 controller, (RAID 5) (66 mhz PCI bus)
NIC: 3COM 3C996B-T gigabit NIC, (66 mhz PCI bus)
I have the 2 IBM's set as RAID 1, (mirror) and the 4 Seagates as RAID 5, (1.5 TB) I have installed the OS with minor problems, (motherboard doesn't like the 2.6.18-128.1.14.el5 kernel, removed it from my grub.conf).
My problem is mounting the RAID array. I have done the following:
formatted with fdisk;
fdisk /dev/sdb
Then formatted with the following command;
mkfs.ext3 -m 0 /dev/sdb
The hard drive was formatted with the ext3 files system, but I have mounted it as an ext2 file system as I don't want 'journaling' to occur. I then edited my /ect/fstab like this: .....
Then: mount -a
When I go into my "home" directory and type ls, I get the following:
[root@hydra home]# ls -l
total 24
drwx------ 2 zog zog 4096 Jun 23 15:50 zog
lrwxrwxrwx 1 root root 6 Jun 23 15:46 home -> /home/
drwxrwxrwx 2 root root 16384 Jun 23 15:34 lost+found
drwxr-xr-x 2 root root 4096 Jun 23 17:18 tmp
Why my home directory is showing under home?
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May 28, 2010
I have recently had a problem with my 10.04 server machine. It will not boot, it seems to be taking forever on the loading screen (normally headless server, but I connected monitor when I couldn't ssh), but that's not why I'm here.
Knowing that I do rsync backups every night at midnight of my machine I just bit the bullet and formatted my / partition. Reinstall went fine, I turned off automatic updates (I suspect an update caused the problem) But now I cannot mount my jmicron raid 1, which is where my rsync backup is (doh!).
sudo fdisk -l
Code:
WARNING: GPT (GUID Partition Table) detected on '/dev/sdd'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
[Code]....
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Apr 20, 2011
I have an old server I build 7 years ago. I have a RAID5 with 5x2TB HD's and I'm planning a major hardware overhaul. My server currently runs on a Pentium4 3.2 Ghz (pre multicore technology) on a SuperMicro mobo. I'm planning to switch to an AMD Phenom II X6 1100T Black Edition Thuban 3.3GHz, 3.7GHz Turbo 6.
So here's the question. Can I just plug my drives to the new board and restart the RAID like nothing happened? I don't have space to backup all my data if I have to recreate the RAID from scratch.
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Mar 26, 2011
I have an Areca hardware RAID array that I'm trying to format & partition on a fresh Ubuntu 10.04 LTS installation. The OS drive is not on the RAID card, it's entirely separate. The RAID is a 6TB volume so I realize I have to use parted to format it, not fdisk (which I've always relied on).
My problem is that I can't figure out how to get parted to like my settings. It seems like everything I try gives me the warning "Warning: The resulting partition is not properly aligned for best performance." Here's what I'm doing:
Code:
(parted) p
Model: Areca ARC-1280-VOL#00 (scsi)[code].....
What start/end settings should I use to get a properly aligned partition? How do I know?I have tried a mix and match of 0, 0s, 1, 1s, -0, -0s, -1, -1s, 100% for my start/end with no success.
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Mar 9, 2011
We have been using Ubuntu Server at our department since several months now. It hosts a website, e-mail and nfs(only intra).
It was set-up as RAID 0 with two 1TB Hard drives but I want to change it to RAID 1 for fault tolerance. Is it possible to change existing RAID level? If yes can someone point me to the proper place?
I tried "mdadm" documentation and level set option is available but no explanation available that whether it is only while creating the array or it can change the level too.
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Jun 4, 2010
I just restarted my server (Ubuntu 9.04 server, running on ESXi 4.0) and while copying files onto the server using samba I got strange problems and the connection was lost. When I rebooted the total system, so ESXi as well as Ubuntu Server I did find problems on my RAID disk.
The directory, where the new files were added I have a lot of files, but a lot of them do not have any info except their name:
1304 -rw-rw-rw- 1 spoorhobby spoorhobby 1327274 2010-05-15 22:10 DSCF1895.JPG
? -????????? ? ? ? ? ? DSCF1896.JPG
? -????????? ? ? ? ? ? DSCF1897.JPG
? -????????? ? ? ? ? ? DSCF1898.JPG
[Code].....
Both mirror disks are still functioning and I can still add/delete files, from the server, from other LINUX systems and from other Windows systems via samba.
I did make a full backup on a different server.
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Jun 11, 2010
so my servers 7 hds in raid 5 all was working well until one of them died. The HD that died sort of works it can read like half a file also freezes on the benchmark test in disk utility. Unfortunate when i take it out on boot it says. The drive for /media_kbt is not ready or present press s to skip or m for manual recovery. I hit s and then go to disk utility. But i can't start or add disks to the array.
Here is me trying to do random stuff
Code:
administrator@3dslice-host:~$ sudo mdadm --stop /dev/md0
[sudo] password for administrator:
mdadm: metadata format 00.90 unknown, ignored.
mdadm: stopped /dev/md0
administrator@3dslice-host:~$ sudo mdadm --add /dev/md0 /dev/sda1
mdadm: metadata format 00.90 unknown, ignored.
[Code]...
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Sep 7, 2010
I'm currently experiencing some serious issues with WRITE performance on a RAID-1 array. I'm running Ubuntu 10.04 64 bit server with the latest updates. To evaluate the performance ran the following test: [URL]... (great article btw!) Using dd to measure, write performance is only at 8.7 MB/s. Read is great though at 74.5 MB/s. The tests were ran straight after rebooting and I have not (YET!) done any kernel tuning or customization, running the default server package of the Ubuntu kernel. Here's the motherboard in the server: [URL]... with a beta bios to support drives over 300GB.
[code]...
As you can see from the bo column there is definitely something stalling. As per top output, the %wa (waiting for i/o) is always around %75 however as per above, writes are stalling. CPU is basically idle all the time. Hard drives are quite new and smartctl (smartmontools) does not detect any faults.
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Jun 6, 2011
I have 10.04 server with a linkstation raid 5 attached via usb. What is the best way to monitor the drives for a failure? Its at a remote site
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Jun 15, 2011
I am trying to use 3 3TB Western Digital drives in a raid 5 software array. The trouble seems to be that the array is created with only 1.5 TB of capacity, rather then the expected 6 TB.
Here are the commands and output:
$ sudo dmraid -f isw -C BackupFull6 --type 5 --disk /dev/sde,/dev/sdf,/dev/sdg --size=5589G
Create a RAID set with ISW metadata format
RAID name: BackupFull6
RAID type: RAID5
RAID size: 5589G (11720982528 blocks)
RAID strip: 64k (128 blocks)
DISKS: /dev/sde, /dev/sdf, /dev/sdg
About to create a RAID set with the above settings. Continue ? [y/n] :y
$ sudo dmraid -s
*** Group superset isw_cdjhcaegij
--> Subset
name: isw_cdjhcaegij_BackupFull6
size : 3131048448
stride : 128
type : raid5_la
status : ok
subsets: 0
devs : 3
spares : 0
So I cannot understand why the size of the created array is only 3131048448 or about 1.5 TB. The first command seemed to imply it was going to create an array with 5589GB.
System is:
Description: Ubuntu 10.04.2 LTS
Release: 10.04
Codename: lucid
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Jun 26, 2011
Ubuntu Server 11.04 i386. I've used linux on and off for years but only in small doses, so I'm really just at newbie level. I was running an Openfiler NAS, but decided to give Ubuntu+Webmin a try. And up 'til now I've been happy with progress. I have set up a RAID-6 array using 5 x 1TB SATA drives. I've ensured that the array is in a "clean" state, and now I want to do some failure testing. The problem occurs when I remove one of the drives in the array. I shutdown, remove a drive, then boot up. The array wont start at all, and comes up with this error during boot:
Quote:
the disk drive for /mnt/raidvol1 is not ready yet or not present
Continue to wait; or Press S to skip mounting or M for manual recovery
If I wait, nothing happens. Obviously the RAID array should start in degraded mode, but it fails to mount at all. When I press "M" to go into manual recovery and type "mount -a" I get the response:
Quote:
mount: special device /dev/RAIDVG1/RAIDLV1 does not exist
I have set BOOT_DEGRADED=true in /etc/initramfs-tools/conf.d/mdadm without success. If I reconnect the disconnected drive, the array works fine, and is in a clean state.
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Feb 20, 2011
I've got a couple of new hard disks that I have partitioned (3 partitions per disk) and set up in a mirrored software raid array using mdadm. They've synced, I've put file systems on them (1 x ext4, 2 x luks + ext4) and I can mount them. I've checked the partitions using fdisk. I've checked the filesystems using fsck. So far so good. Next step is that I'd like mdadm to automatically assemble them on boot. (Not bothered about mounting and crypttabing yet.)
I've used sudo /usr/share/mdadm/mkconf to generate a new mdadm.conf with the appropriate UUIDs for the new partitions. I've checked that this matches the output of sudo mdadm --detail --scan
The new lines in this file are:
ARRAY /dev/md9 level=raid1 num-devices=2 UUID=470fb8a6:45561fe0:ebda4a02:9ba7a1ed
ARRAY /dev/md10 level=raid1 num-devices=2 UUID=f351fbba:c704a4b2:ebda4a02:9ba7a1ed
ARRAY /dev/md8 level=raid1 num-devices=2 UUID=c6ccec17:2274588e:ebda4a02:9ba7a1ed
To check that the mdadm.conf is fine I have stopped the new arrays:
[Code].....
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Mar 7, 2011
Short story: I have a problem with one of my services (mediatomb) - it requires an md RAID array to be mounted in order to start, because it uses files from it. $remote_fs is added by default to the "Required-Start" line of the init script, so I thought that this should be enough. However, the mediatomb service fails to start on boot, but starts just fine when I execute "service mediatomb start" later. The array is entered in /etc/fstab and is automatically mounted on boot.
Long story...
This is my file server (Ubuntu Server 10.10), which has a raid array created with mdadm (mounted on /z), and the root filesystem is located on an USB thumb drive. I've installed mediatomb, but I wanted to put its database files on the raid array instead of the root fs, so I've symlinked /var/lib/mediatomb (the default path) to /z/mediatomb on the array. This is because the mediatomb DB is supposed to be updated fairly often, so I didn't want it to stay on the flash drive.
Problem is, the mediatomb service can't start on boot - in /var/log/mediatomb.log, it says "2011-03-07 19:22:47 ERROR: /var/lib/mediatomb : 20 x No such file or directory". As I said, it works fine when manually started later...
This is the fstab entry for the raid array code...
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Mar 12, 2010
I've recently started having an issue with an mdadm RAID 6 array that been operational for about 2500 hours.
Intermittently during write operations the array stalls, dropping to almost 0 write speed for 10-30 seconds. When this occur one or both of the 2 drives attached to a 2 port Silicon Image si3132 SATA-II controller "locks up" with its activity light locked on. This just started occurring within the last week and didn't seem to coincide with any update that i noticed. The array has just recently passed 12.5% full. The size of the write does not seem to make any difference and it seems completely random. Some times copying a 5 GB dataset results in no slow down other times a torrent downloading to the array at 50kb/sec does cause a slow down and vise versa.
The array consists of 8 WD 1.5TB drives, 6 attached to the ICH9R south bridge, and 2 attached to a si3132 based PCI express card. The array is formatted as a single ext4 partition.
Checking SMART data for all drives shows no errors. Testing read speed with hdparm reports what i would expect (100mb/sec for each drive, ~425mb/sec for the array).
The only thing i did notice is that udma6 is enabled for all the ICH9R drives while only udma5 is enabled for the si3132 drives. Write cache is enabled for all the disks. Attempting to set the si3132 drive to udma6 results in an IO error from hdparm.
The si3132 drive is using the sata_sil24 driver. Nothing of interest appears in the kern or syslog. During this time top shows very high wait time.
The s13132 controller appears to have the original firmware from 2006 loaded, there are some firmware updates available on the Silicon Image website for this controller that now appear to offer separate firmwares for RAID operation (some sort of hybrid controller/software thing the controller supports) and a separate firmware for standard IDE use.
Has anyone had similar issues with this controller? Is a firmware update a reasonable course of action? If so which firmware is best supported by the linux driver?
I know i'm not using its raid features but i've dealt with controllers that needed to be in raid mode for ahci to be active and for linux to work well with them. I'm bit ify at the idea of just trying it and finding out as it could knock 2 disks of my array out of action.
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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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Mar 17, 2011
I have a client with a pair of Supermicro 6025B-T servers that he wants to have Ubuntu 10.10 64bit Server running on for VM/Cloud experimenting. He needs these to be set up RAID 10. I can go into the Adaptec utility and make the array and make it bootable and get to the point in the installer where it asks me if I want to use the SATA array - then it gets to the partitioning screen and the array is nowhere to be found.
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May 31, 2011
I've been having some problems w/ a my RAID 5 array, and after extensive investigation, I'm fairly sure that my last resort is rebuilding the array. I'd tried --assemble, b/c it's a previously created array, but it didn't seem to like that. So, I checked into --create, and it will re-create the array w/out destroying the data, if the superblocks are persistent, which they seem to be. However, here's what I get:
[Code]....
My question is: why do /dev/sdb1 and /dev/sdi1 show as both ext2fs and also as part of a RAID array?
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Jul 11, 2010
After upgrading my ubuntu install my raid array is gone. The drives appear in blkid as "Linux raid member" and both have the same uuid. If I try to mount the drive via fstab I get a message that the drive is not ready or present. If I try to mount each of the two drives, one mounts successfully the other reports serious errors. Issuing a cat /proc/mdstat shows md_d0 as inactive.How can I re-establish my raid array? I have the data backed up so if I have to wipe out the disks to start over that's an option.
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Aug 6, 2010
I currently have a nice HTPC setup that has been upgraded from distribution to distribution since 8.xx all the way up to 9.10 now. I just moved to a new place and it feels like the right time to do a fresh install of 10.04 into the HTPC. The problem is that I have a RAID 5 array in the system that has all my pictures, videos, music, etc. This OS is installed in a separate drive that is not part of the RAID array (I have 4 drives in the system, 3 in the array, 1 for the OS). what is the general process I should follow to do:
1. a fresh install of 10.04
2. do #1 while at the same time not losing my array (don't think I would anyway).
3. what to do after install to get the array back up and running and mounted.
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Sep 15, 2010
I am using the 10.04.1 x64 Kubuntu live CD to install Kubuntu on my FakeRAID 0 array, I tell it not to install grub as i know it is still currently broken. the install goes flawlessly. However on first boot using my live grub CD unless i tell my computer to point to the CD it will hang (which it is told to boot from CD first so i'm not sure why it does.) When i tell it to boot to Linux, it will not boot saying the kernel is missing files (to much to sadly list, all i do not understand) then offers me a terminal to input "help" into for a list of Linux commands. Windows 7 pro x64 works just fine CD was downloaded VIA P2P if it matters
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Nov 27, 2010
repairing the MBR on my raid array. I have three disks, each with three paritions:root (sda1 sdb1 sdc1) 59GB swap (sda2 sdb2 sdc2) 1.12GB grub/boot (sda3 sdb3 sdc3) 298MB I have been able to get this running and it has been working fine for several months. A few days ago, I installed 10.04 to a USB stick but did not disable the hard drives at that point and so the MBR was overwritten. If I leave the USB stick in, it boots fine from that stick. However now I can't get the boot from the raid array to work correctly. I can do the following:Load 10.04 from the Live CD install mdadm recreate the root partition using
Code:
mdadm --assemble /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1
I can mount and view the files on md0 with no problems. It's not corrupted in any way. When I installed, I followed the directions to make each of the grub drives bootable. However I don't know for sure whether grub was installed on each partition separately or if it was installed on the assembled partition only. I have tried using
Code:
sudo grub-install /dev/sda3
and got warnings, something to the effect
Code:
Cannot find a device for /boot/grub
no path or device specified
Auto-detection of a filesystem module failed
specify the module with option '--module' explicitly
I have also been able to get to the grub rescue prompt but my keyboard (wireless USB) is not recognized and so I can't type anything in at that point.
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Apr 11, 2010
I wanted to merge my 1TB disks into and RAID 5 array, 4 of them in RAID 5 is above 2Terabytes limit of msdos partition tables which grub2 can boot from, so I decided to start up the system from scratch, by building it on GPT partitions, but seems grub2 won't boot from GPT partition because it drops to grub rescue and I can't really do anything from there.
here's my set up:
/dev/md0 (raid 1) - 100MB total:
- dev/sda1, /dev/sdb1, /dev/sdc1, /dev/sdd1
/dev/md1 (raid 5) - 45GB total:
- dev/sda2, /dev/sdb2, /dev/sdc2, /dev/sdd2
/dev/md2 (raid 5) - something bit lower than 3TB:
- dev/sda3, /dev/sdb3, /dev/sdc3, /dev/sdd3
any tips how to have this system up and running? Because I've spent like 3 days jumping over various problems
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Jul 8, 2010
What is the best way to install Windows and Linux on two-hard-disk array? In fakeraid there are no problems in Win, but linux installation is almost impossible (i've tried unsuccessfully...). In software raid it would be impossible to share files between win and linux? And finally hardware raid is possible, but cheap controllers have low performance. Is there any other way (apart from spending a lot of $$ for adaptec controller) ?
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