Ubuntu Servers :: Move A Software RAID Volume?
Apr 1, 2011
I have a software raid array (in this test case a mirrored set of two 500GB volumes) and I want to move them to another OS installation on the same hardware. (This is testing in preparation for a physical move two arrays onto a single server.) I had the array up and working (surviving reboots), wrote a test backup onto it in a folder.
Shut the machine down, re-installed ubuntu, got it up and running, then installed mdadm, rebooted with the array powered up and ran mdadm --detail --scan , expecting to see mdadm at least find the parts of the array. Instead, I get nothing. I even added -vv to get more verbose output. de nada.
[Code]...
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Jul 24, 2010
I've got a file server with two RAID volumes. The one in question is 6 1TB SATA drives in a RAID6 configuration. I recently thought one drive was becoming faulty, so I removed it from the set. After running some stress tests, I determined my underlying problem hadn't cleared up. I added the disk back, which started the resync. Later on, the underlying problem caused another lock up. After a hard-reboot, the array will not start. I'm out of ideas on how to kick this over.
Code:
$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
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Dec 1, 2010
I'm rearranging a bunch of disks on my server at home and I find myself in the position of wanting to move a bunch of LVM logical volumes to another volume group. Is there a simple way to do this? I saw mention of a cplv command but this seems to be either old or not something that was ever available for linux.
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May 7, 2011
I have a system with a 2TB RAID level 1 installed (2 x 2TB drives, configured as RAID1 through the BIOS). I installed Centos 5.5 and it runs fine. I now added another 2x2TB drives and configured them as RAID1 through the BIOS.
How do I add this new RAID volume to the existing logical volume?
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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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May 8, 2011
I have v 10.10 running the following (and I still have no idea how I got this all working). Myth, Squeeze server, X10 control system for the house, Virtualbox (where I run some windows stuff) and a general file and print service. It has 5 disk drives attached
1 - system disk
5- external usb to back up data to
2,3,4 - 2 tb drives in a raid config
I just restarted the server and the raid volume has not mounted. I looked in the webmin interface and the device is there but it doesn't seem to have the partitions attached. Again in webmin, the partitions seem to be on each of the drives. I used crash-plan to back up the data and music, but not the video, so I would prefer not to have to rebuild the lot if I don't have to. I really don't want to re build the lot out of my lack of experience with Linux. Is there an easy (ish) way of putting the raid back together to see if it's just dropped its config and the data is in tact (or can be rebuild from two of the three drives).
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Apr 4, 2011
I am unable to hibernate my computer while using Ubuntu and I figured out the reason--Ubuntu is not using my swap partition. I would follow the existing tutorials on setting up a swap partition after installing Ubuntu, but since the volume uses hardware RAID 0, the swap partition is not assigned a /dev/ entry (like /dev/sdxx) and I am not sure how I can mount it.
Here is what I have:
Code:
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Oct 10, 2010
About a year ago I bought a new compy and decided to get on-motherboard RAID, and by golly I was gonna use it, even if it wasn't worth it.
Well, after one year, two upgrades, a lot of random problems dealing with RAID support, and a lot of articles read, I have come to my senses.
The problem: I have a fakeraid using dmraid, RAID 1, two SATA harddrives. They are mirrors of eachother, including separate home and root partitions. I actually found the method I think I had used here: [URL]
The ideal solution: No need to reinstall, no need of another drive, no need to format.
My last resort: Buy a drive, copy my home directory, start from scratch, copy my stuff over.
PS: if it matters, I'm on 64 bit 10.04 LTS
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Dec 3, 2010
I have a CentOS 5 production server with multiple OS-managed RAID-1 sets. I'd like to add a new mirrored set and move the /var partition to the new drives. On a non-RAID system I would boot from the install CD to edit fstab and copy the existing files to the new drive, but I'm pretty sure booting off the install CD does not recognize my RAID setup.
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Feb 12, 2010
I have a raid 5 array formatted with ntfs; My Ubuntu OS is not able to recognize the raid 5 array but my windows 7 OS can. I had this working before when I installed ubuntu via wubi but now since i installed it as a dual boot OS I am having issues trying to mount this raid 5 volume. So far i have tried reinstalling the dmraid, ntfs config manager, and storage device manager however nothing seems to help me recognize my raid 5 array.
P5N32 E-SLI PLUS MOTHERBOARD: RAID 5 ARRAY NTFS with NVIDIA's raid chipset that comes built in with motherboard.
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Jul 7, 2009
I have expanded a HP array by 500GB but am struggling to get Centos (Xenserver installation) to see it.
From the array controller the size of the disk is 1.4TB
Logical Drive: 2
Size: 1.4 TB
Fault Tolerance: RAID 5
Heads: 255
[Code].....
how I get LVM to see the whole disk that is now available (without destoying daya).
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Jul 10, 2010
After months of using Lenny & Lucid Lynx without issues, I come back to the good existential questions.
I'd like a completely encrypted disk (/ and swap) in addition to the Xp partitions (not that safe but I'll switch completely to Linux once I have solved everything.
1. I create an ext4 partition for /boot
2. One other (/dev/sda7) that I set for encryption,
3. On top of that, I create a PV for lvm2,
4. I add to a VG,
5. I create / & swap in the VG.
However, if I add a hard drive, I will have to encrypt the main partition, add it to the VG & then expand /. So I'll need 2 passwords at boot time to decrypt.
So I'd like to:
-Encrypt the VG directly, it would solve everything but no device file appears for the VG, only the PV and th LV.
-After hours of search, I couldn't find a solution for a single password...
Maybe a hope with a filesystem like btrfs in the future providing encryption, but I'll still have to create a swap partition out of it (or create a file for swap but no hibernation possible).
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Mar 23, 2010
I've been using Fedora and Ubuntu on a standard PC/laptop (one HDD) for some time, but just as a user. Recently I built a PC with Asus P5K WS motherboard with RAID adapter on board. I've got 5 750GB SATA drives, however hardware restrictions only allows me to create Logical Volume up to 2TB. SO I've created RAID 5 on 3 drives as SysVol and RAID0 on 2 drives for data.
Ran live CD and started to install OS. However I get to point, when system scans for storage devices. It detects smaller volume, but not the SysVol, I want to install the system on. It is offering me to install system on the smaller volume. I've deleted the smaller volume and left one RAID 5 volume and 2 drives. Again the same problem. System detects those 2 drives, but not the volume.
Is there any restriction in Fedora 12 allowing installation on certain LV? Or is it more HW problem?
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Jul 1, 2009
I'm experimenting on a new 5.7TB raid we got for one of our servers before it goes into production. I'm carving the space up into Volume Groups and Logical Volumes. Below is some sample output:
[root@server newhome]# vgdisplay
--- Volume group ---
VG Name extraid_sdd1
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 1.82 TB
PE Size 4.00 MB
Total PE 476804
Alloc PE / Size 476804 / 1.82 TB
Free PE / Size 0 / 0
VG UUID LJPJVE-fekS-crS8-uugk-l13z-0NG0-FWv3M3
--- Volume group --
VG Name extraid_sdb1
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 2
Act PV 2
VG Size 3.64 TB
PE Size 4.00 MB
Total PE 953608
Alloc PE / Size 953608 / 3.64 TB
Free PE / Size 0 / 0
VG UUID kzlLN4-PyrX-LYUS-h1Tc-1S9F-jVV0-XU5tcK
Because I created this, I know that the second 3.64tb Volume Group, extraid_sdb1, is composed of two physical volumes, /dev/sdb1 and /dev/sdc1, each one 1.82TB in size. My question is, if I hadn't made this and had to work backward, how could I discover that info? I can see that the second VG is composed of 2 PVs by the "Cur PV" line. But if I didn't know that they are my /dev/sdb1 and /dev/sdc1, how could I break that out, as well as their sizes? If it matters, this system is running FC6.
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Dec 22, 2010
I'm asking for an advice about the setup of a large volume: I have 2 disks of 1 Tb each and I want to merge them in a single volume/partition. I am in doubt about setting up a LVM, a RAID0 device or both. I know that RAID0 has no redundancy but I will manage a backup on other media, so that I can take advantage of the stripe feature in terms of I/O performance. On the other hand LVM let me to easily manage and expand the volume in a near future. Am I correct? Anyway I don't know if I can ever setup both and in which order. First LVM then RAID, I suppose.
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Jul 29, 2010
Hi,
I am experiencing problems in creating a physical volume on RAID 1 system.
Here is what I did.
#/usr/sbin/pvcreate /dev/md0
the message reads:
"Device /dev/md0 not found (or ignored by filtering)."
The /dev/md0 has a partition type 8e for linux LVM
Can anyone enlighten me?
Thanks
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Sep 16, 2010
Right now I have a OpenSuSE 11.1 server running on a single hard drive. I want to install the HighPoint RocketRAID 1740 card and utilize RAID 10.I wanted to know if the following process would work ok:
1. Image the current hard drive using clonezilla and remove the drive.
2. Install the RAID card with 4 hard drives of the same make and model as the current drive
3. Create the logical volume
4. Restore the image to that volume
Since I am restoring the image to a RAID volume, is that completely transparent to the OS? Or do I need to do a clean install on that volume and reconfigure everything?
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Apr 8, 2010
I believe server section is the best when speaking of RAID stuff...
I have the following situation:We have a DELL T3400 with embedded fake raid on it. I dont know exactly how the system was setup (I wasnt here at that time), but the RAID was enabled in bios and while booting, the two harddrives would be seen as members of intel raid volume0 (RAID 1 mirror). I am not sure if the software raid was actually properly configured in Linux (Fedora 9) and if the OS was reconstructing the whole raid or it was just the bios part that was mirroring the /boot or just some parts of it. Frankly I find these hydrid raids very confusing.Some bad disk manipulation from my part caused the server to crash, but I was able to recover and boot just with one hard drive after using fsck.
I decided to get rid of the raid as it's not the right solution for the application we need it for and decided to go for a traditional single harddrive system and to use Ghost for Linux to clone to a spare disk when backups are needed.So I installed the latest Fedora 12 distribution onto another harddrive and disabled RAID in bios (changed from RAID ON to autodetect, which is the only other option).
Here is what I have now:
/dev/sda has the newly installed fedora 12
/dev/sdb is an empty harddrive that I would use as an intermediate
/dev/sdc is the old harddrive member of intel raid volume0
sdb was partitioned into sdb1 sdb2 and sdb3 and I created an ext3 filesystem on sdb2. The hard drive belonging to RAID volume0 (sdc) has a lot of work done on it and I would like to be able to recuperate the files to the new disk (sda). I cannot mount that old harddrive while in fedora 12, as it sees some unknown raid member filesystem on it probably assigned by the intel raid chip.
So I decided to do it from the other side: to boot from raid volume 0, and from there mount a third intermediate harddrive (sdb) onto which I would copy the documents and then mount the same harddrive from the newly installed fedora 12 and copy those documents from that intermediate harddrive.I can mount /dev/sdb2 from fedora 12 fine and copy stuff to and from it, but not when I boot from the RAID volume 0 harddrive (sdc) with fedora 9 on it. It keeps saying that the partition in question (/dev/sdb2) is an invalid block device.I am stuck here, as my knowledge in this sort of things is very limited.If somebody can indicate me how to recuperate files from that old raid harddrive onto the new fedora 12 drive, I would appreciate a lot.
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Jul 2, 2011
Adding a kernel parameter to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nodmraid" (not 100% it should go there grub2 is new to me, but that is another story) I noticed the following error when running update-grub.
ERROR: ddf1: wrong # of devices in RAID set "ddf1_Series1" [1/2] on /dev/sdb No volume groups found
Now I have not a clue where it is getting ddf1_Series1 from.sdf1 is part of a RAID1 group that has mdadm RAID1 > luks > LVM
md6 : active raid1 sdi1[1] sdf1[0]
1465135936 blocks [2/2] [UU]
bitmap: 0/175 pages [0KB], 4096KB chunk
Errors bug me.. as I am new to grub2 was wondering if anyone has an insight into the error / where to investigate Still reading the grub2 / grub manuals.
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Apr 25, 2010
I currently have a raid setup of 2 1tb hdd's that i can use from my windows install, but in ubuntu i cannot find it. Is it possible to reach a raid volume from both os?
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Oct 14, 2010
I've been poking at the options in mdadm and dmraid for 2 hours now and don't see exactly what I need. (and trying things I'm not 100% sure of would be silly)
2 drive raid1 array. moved to another box running the same version of Ubuntu. (10.04)
I've googled and googled and can't find anyone else with this same task - what am I missing? The array is physically fine and doesn't need rebuilding, unless in this context it does somehow.
The two devices are sdb and sdc.
Output of mdadm -Es:
Code:
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=97e83cac:4d76d392:e368bf24:bd0fce41
So the array is somehow visible, but I don't see what my next step needs to be.
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May 14, 2010
ok I have the original install 170GB partition mounted on /
I need the following;
OS on / 30 GB
data mounted on / data 140GB
Fdisk would have been a joke, but the box was setup via lvm, so I am learning on the fly. I was able to shrink the partition using;
lvreduce -L 30G /dev/mapper/server-root
vgcreate shows;
VG Size 169/76GiB
Alloc PE / Size 9453 / 36.93GiB
Free PE / Size 34005 / 132.83 GiB
Now, per my DBA, I need that 130 on a seperate 'partition' and I am not 100% sure on the next step. I am reading on vgcreate, lvcreate, etc.
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Dec 19, 2010
I'm looking for ideas on how to transfer a group of xml files from one server to another server, either in a regular interval or ?I have a listing program, it creates a directory or classified ad type listing. When one of these is created, or an existing one is edited an XML file is created. I need to take these files and get them to another server. I've read about SOAP, FOPEN and of course FTP.
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Jul 30, 2011
Is there a way to move files to a usb stick?
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May 3, 2010
Building an Ubuntu file server that would be running software RAID5. While I think I have most of it figured out, I'm still a bit fuzzy about this: what happens if I trash or otherwise have to re-install my OS (because I decide to upgrade to a newer version, switch distros, or whatever)? Would the new OS be able to "see" that there was a RAID5 array on the disks and make use of it? Or would I for sure lose all of the data on the array?
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Feb 9, 2010
I'm in the middle of moving my lab to a new server in the middle of the school year.. and need to copy all the user accounts to the new box, hopefully with all the student's passwords and contents of their folders intact.And since we are using the system daily, I need to do it all in an hour or 2.I'm thinking I can just
1. diff /etc/passwd and /etc/shadow from the old the new
2. copy all the student folders to new /home
3. write a script to set the permissions on all the new /home folders to match the user names.
It seems easy and safe so long as I back up the 2 existing files..Any reason not to try? Or is there an easier way?
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Apr 13, 2010
i have a complete local ubuntu mirror; nicely kept in sync by apt-mirror. unfortunately, i need to keep some of the old releases as well. [URL].. kindly provides those. with the upcoming end-of-life of intrepid ibex, i would like to move the packages for intrepid on my mirror to the directory i use for the old-releases, without having to download these approximately 30GB from the original server.
is there a way to move distributions in a local mirror? apt-move seems only capable of rearranging the packages in /var/cache/apt/archives/ .
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May 6, 2010
I have a Ubuntu 10.04 server configured with an lxc container also running 10.04. I wonder if somebody knows the correct procedure to move such a container to another server? I tried a straight rsync both with the source up and down but mysql won't start on boot after move and if I manually start it none of the websites within the container are able to connect to mysql. I can connect to mysql using telnet of the command line client.
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Aug 10, 2010
How can I redirect my URL after a site move.I have phpBB forum software installed on a 10.04 server, and I recently moved the forums from mysite.com/forums/ to mysite.com/.
So, a thread that looked like
mysite.com/forums/viewtopic=...
now looks like
[code]...
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Mar 25, 2010
I have an LVM group containing three 500GB drives in my NAS/home server. Last week, the contents of this group(ext4) disappeared with no apparent explanation.
I've been looking around for solutions, and here's what I've tried:Restoring the LVM configuration using vgcfgrestore with the most recent file from /etc/lvm/backup/. This restored just a few of the folders. Run fsck on the group. Lots of errors, all fixed, but nothing more appears. Run badblocks on each of the disks, no errors found.
It seems there is nothing wrong with the drives physically, or with the software configuration, so where have the files gone?
Even if I can't restore the full volume, if I could just grab what I can from the drives.
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