Ubuntu :: Any Way To Recreate LVM RAID 1 Partition?
Sep 6, 2010
How do I recreate an LVM raid 1 partition, without destroying data on the discs? I have a 650GB data partition which is a raid 1 array with ext3. Two days ago, the system (Ubuntu 9.04) started to refuse to write to it, claiming no space left on device - even if there is ca. 102GB free left, if the disk is 85% full (according to df)! Interestingly, removing a couple of GB did not help, after reboot the disk was again full..
I did the "tune2fs -m 0" trick and then forced file check on next reboot by "sudo touch /forcefsck" .. and the result is that the raid partition is gone. I have the two physical drives /dev/sd*, unmounted, but the /dev/md1 is no longer there. What can I do to re-create it, without losing the data? I realized that I ran tune2fs on the physical partitions /dev/sd* - was I supposed to run it on /dev/md1?
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Dec 11, 2010
I rebuilt a server and am now trying to recover my large data arrays. The server was ubuntu 10.04lts before. I decided to rebuild it with CentOS simply because I am more familiar with it. I had 2 raid-5 arrays on the old server:4 x 1tb -> md0 5 x 2tb -> md1 The newly built server does not know about these arrays yet. How can I reassemble the arrays without loosing my data? I know the data can still be accessed because booting the server with a live-cd mounts and shows the arrays just fine. Should I boot with a live cd and copy the mdadm config file?
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Sep 16, 2010
i trying to recreate(after zero-superblock) raid 10 but get stuck with near=1, far=2 layout, how i can setup this layout using mdadm.
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Oct 21, 2010
way to recreate /boot partition for Fedora 13.
For some reason my system crash yesterday and I had to power down the machine (the only bit of information I still remember it mentioned CPU2 stop for few seconds). The next day my system only shows grub console. I tried to mount the partition but failed. here's what i tried
Code:
# mount -t ext4 /dev/dm-1 /mnt/oldboot
mount: wrong fs type, bad option, bad superblock on /dev/mapper/XXXXXX,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
[Code].....
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May 29, 2010
I reformatted a ntfs drive to fat32, meaning to only reformat one partition on the drive. Because the partition table is overwritten I cannot simply restore the old partition table. Any thoughts on tools that I can use to manually re-create the partitions and save the data?
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May 2, 2010
OpenSUSE 11.2 server, Gigabyte GA-MA790X-UD4P sda for system, 3 ext4 partitions, working fine.sdb promise RAID1 for data, 1 ext4 partition, working fine.sdc is an eSATA docking station for data backup, 1 encrypted ext4 partition -- here lies the problem.
This configuration has been functional for months until I decided to add two more external drives (sdc) to rotate through backups. I had difficulty with encyption on the first new drive and eventually decided to start over. Using the gui Yast Expert Partitioner, I deleted the single partition. That began a real nightmare...
Since deleting the partition, the system detects drives inserted in the docking station, but does not report them (including a different fully functional drive and a brand new unused drive). I have tested all drives on other computers and they function perfectly. I have rebooted the system several times while troubleshooting this issue.
Could not recreate the partition on server (since it does not recognize the drive), so I used Gparted on another computer - it all went without a hitch, formatted ext4. But when I placed the drive in the dock, the drive still was detected but not recognized.
Details:
BIOS lists the eSATA drive
Entering Yast Expert Partitioner, error message follows:
The partitioning on disk /dev/sdc is not readable by the partitioning tool parted, which is used to change the partition table.
You can use the partitions on disk /dev/sdc as they are. You can format them and assign mount points to them, but you cannot add, edit, resize, or remove partitions from that disk with this tool.
Yast partitioner shows drives: sda, sda1, sda2, sda3, sdb, sdb1 sbc is not listed.
# fdisk sdc results in: Unable to open sdc
# dmesg | grep tail reports:
[48442.370779] sd 0:0:0:0: [sdc] Unhandled error code
[48442.370793] sd 0:0:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
code....
So how did partition deletion cause this issue, and how do I correct the problem? It is possible that my difficulties encrypting the first new drive are related (it's not my first time doing it successfully). It seems the problem is in the Kernel or configuration. I have invested many hours in forums and on google - tried dozens of possible fixes. I'm beginning to suspect system corruption or a bug, however all other system functions are working perfectly.
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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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Feb 11, 2010
I have two hard drives inside an Ubuntu 9.10 machine, each with a data partition on. What I want to do is as I save files to one data partition partition (or delete them) I want the files copying/deleted automatically on the the other data partition. I do not want to start using RAID or end-of-day incremental backups.
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Jul 16, 2010
The ext4 file system creation in partition #1 of Serial ATA RAID isw_fjidifbhi_Volume0 (mirror) failed. Not sure what's wrong? How do I solve this? This happens after I enter my login details and click next. Then it fails on the install screen with this error.
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Jul 16, 2010
Been attempting to install ubuntu on my Intel fake raid on a new PC.The installer sees the raid, but errors out:Quote:The ext4 file system creation in partition #1 of Serial ATA RAID isw_ehbgbddej_Volume0 (mirror) failed.This seem to be the EXACT issue described in this bug report:I read all the way down this bug report, and at the bottom it says:Quote:Launchpad Janitor on 2010-06-25Changed in parted (Ubuntu Lucid):status: Fix Committed → Fix ReleasedA few weeks ago, a fix was "committed" and "released". I had been working with an earlier 10.04 ISO, so I downloaded 10.04 from the web site today. Still the same problem.Maybe I'm just reading the bug report wrong? If it says the fix is committed and released, I would naively assume that it is fixed. Do I need to patch to apply the fix or something? Doesn't seem likely.
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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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May 13, 2011
I am trying to grow my array to make full use of my drives. I have a raid 6 using mdadm on my home server. The array used to consist of 6 1.5TB drives when it was created. Since then I've been replacing the 1.5TB drives with new 2TB drives. And now I have replaced the last 2 drives.
When I added the first 3 disks I did not use the whole disk for the raid partition but rather made it the same size as the 1.5 partitions. As it turns out this may have been a bad idea. (But it gave me another 3 partitions of 500GB that I turned into 1 disk using mhddfs.)
Now I'm trying to grow the array. I've been testing in a virtual enviroment on how to do it but I cannot find another method than this :
1) fail 1 disk.
2) re-partition the disk with the size of the whole disk.
3) re-add the drive as a spare.
4) start the now degraded array to let it resync.
5) wait quite a while. (aprox 5 hours)
6) start again from step 1 for the other disks.
7) use mdadm with grow command to enlarge the array
use resize2fs to fill array to max size
Now although since this is a raid 6, I keep some redundancy but I still worry about degrading the array so manny times and rebuilding the whole thing. I mean I read the thing out 3 or 4 times over doing this.
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Sep 1, 2011
Quote:
EFI GUID Partition support works on both 32bit and 64bit platforms. You must include GPT support in kernel in order to use GPT. If you don't include GPT support in Linux kernel, after rebooting the server, the file system will no longer be mountable or the GPT table will get corrupted. By default Redhat Enterprise Linux / CentOS comes with GPT kernel support. However, *******if you are using Debian or Ubuntu Linux,******** you need to recompile the kernel. Set CONFIG_EFI_PARTITION to y to compile this feature.
Is this true? Ubuntu has no GPT support native to the server install? Never compiled a kernel. Is that of itself going to be a mind bender? How much doo doo am I going to get into if I haven't done it a few times? Trust me when I tell you its no thrill formatting and reformatting a 8tb raid drive or the individual disks if it screws up. Been on that ride way too long already. Need things to go smoothly. This is not a play toy server, but will be used in a business.
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Oct 21, 2010
I have installed Ubuntu 10.04 LTS on machine but wanted to choose RAID and LVM during partition scheme. Unfortunately I couldn't find such option during partitioning. Is it true that for Ubuntu 10.04 LTS it is unable to use RAID and LVM ?
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Feb 26, 2011
I am finally, and happily ditching Windows IIS, SQL Server, and ASP in favor of LAMP. Not only will I save a bunch of money on operating systems but I've found php and MySQL development to be much faster than their Microsoft counterparts.Currently I have two W2008 and two Ubuntu servers running and doing virtually parallel tasks. I want to can the W2008 machines but I am not 100% sure of my Ubuntu mirrors.Everything seems to be working fine. I've copied tons of data back and forth as a primitive test but sometimes things work fine for all the wrong reasons. Here's where I get confused.
Question 1:Do I need to partition the RAID device (MD0) and then format it?From my experience this is necessary to get the device to mount.
Question 2:In this case was it also necessary to format the individual drive partitions?
Question 3:If I do a daily cat /proc/mdstat is this all I need to do to check the drive status.
Question 4:Is there any other check I can do to assure that the mirrors are created, mounted, and operating correctly?
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Sep 1, 2011
I have two disks in a RAID.
Code:
SATA device C465.76 GBATA WDC WD5000AVDS-6
SATA device D465.76 GBATA WDC WD5000AAKS-0
[code]....
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Aug 9, 2011
I have been working in my spare time over the last few days, Had problems with the whole grub2 not installing on RAID 1. Then I found out that I had to have a separate non raid Ext4 partition on one drive with "/Boot" as mount point and install went though fine.
My question is, will the developers FIX this. I mean if I only have 2 x 2tb drives in teh pc as RAID 1, and the one fails with the boot partition the whole machine goes down. Kinda defeats the whole RAID feature huh.
I USED to run a windows network with RAID 5 servers, and windows never had a problem installing everything on the RAID. Or even setting up RAID 1 in the bios on the PC and installing XP or NT4 on the RAID 1. There was never a need for a separate non raid boot partition.
Do we need a separate RAID friendly/enabled Grub? I guess for now I will get a 250gb drive and install the Server OS to it, and setup RAID1 manually after the server OS boots. Then will make a ghost type image of the server in case that drive fails so I can quickly install a new drive and restore the image and get it back up and running again.
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Aug 26, 2009
I am trying to partition my server before installing CentOS and cPanel.I have hardware RAID 1/10 On RAID 1 I would have
/
/boot
On RAID 10 I would have
/tmp
/usr
/var
/var/log
2 GB swap
/home
Is it correct partionining setup?What should I have on RAID 10 ?
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Mar 1, 2010
I have just installed a new version of fedora 12 64bit and have setup the following drive configuration -
Code:
But for some reason I am getting dm-1 and dm-3.
How can I change the array so it contains the normal /dev/sda and /dev/sdb disks and partitions?
Why is the system telling me my drives are dm devices? I have no bios raid features on the motherboard.
How do I use md-1 and md-3 partitions?
How do I go back to the traditional /dev/sda and /dev/sdb devices?
By the way the system tells me that /dev/sda1 and /dev/sdb1 do not exist.
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Mar 1, 2010
I have just installed a new version of fedora 12 64bit and have setup the following drive configuration -
Code: [root@fedora ~]# cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sdc1[0] sdd1[1]
312568576 blocks [2/2] [UU]
[Code]....
but for some reason I am getting dm-1 and dm-3.
How can I change the array so it contains the normal /dev/sda and /dev/sdb disks and partitions?
Why is the system telling me my drives are dm devices? I have no bios raid features on the motherboard.
How do I use md-1 and md-3 partitions?
How do I go back to the traditional /dev/sda and /dev/sdb devices?
By the way the system tells me that /dev/sda1 and /dev/sdb1 do not exist.
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Jun 22, 2011
I'd like to set up RAID for my data partition.
My data are in /dev/sda5 (ext3).
There's an empty partition /dev/sdb5 (ext3).
I want /dev/sdb5 to be a mirror image of /dev/sda5, the command to invoke should be :
mdadm --create /dev/md0 --level=mirror --raid-devices=2 /dev/sda5 /dev/sdb5
My question is : how to ensure that the synchronization is done by copying data to the empty space and not the converse ?
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Jan 12, 2010
I have 8.04 running mdadm raid 1. I selected the wrong drive in gparted and managed to hose my partition tables.
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Jun 3, 2010
After a disastrous upgrade to 10.04 I am at my wits end trying to recover my /home partition from my unbootable system. The /home partition is part of a RAID5 array across 4 disks and I've been trying to use some disk imaging tools from Ultimate Boot CD to recover it with, but none of the utilities seem to recognize or will let me work with my multi-disk device.
Currently I've been booting up with a Live CD in attempts to mount the encrypted partition then copy all the files to an external device I bought, but the mounting process has presented me with some problems. The partition in encrypted with ecryptfs and I have both the disk's passphrase as well as an FNEK signature to work with. Attempting the following:
Code:
Another small issue is the cipher I used. I don't remember which kind of encryption the disk is encrypted with (80% sure it's aes though). I assume figuring out which cipher I used will be more like a guessing game through the ecryptfs mount prompt, but I'm wondering if this would affect the error message I get.
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Jul 13, 2010
I am trying to install Ubuntu Server 10.04 on a home server I am making. I have 3 1-TB drives set up in RAID 5 via my mobo (ASUS M2NPV-VM). The installation detects that I have a RAID array, but when it goes to partition, all it shows me is the usb stick I am installing from.
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Dec 21, 2015
Have a new debian install on a asus h170m-plus (was going to use ubuntu but didnt support the hardware/software combo i needed)
Install is fine. but during install it didnt see my 1tb raid1 drive..
after reboot, debain boots great, and i can mount the raid drive in the file manager.
I can see it and in mtab it shows up :
"/dev/md126 /media/user/50666249-947c-4e8f-8f56-556b713a6b6a ext4 rw,nosuid,nodev,relatime,data=ordered 0 0"
How can I permanently add this mount point so it is found at boot up at /data...
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Jun 9, 2011
After an install of suse 11.4, one of my drives raid 0 (ichr9 intel) does not mount and is not recognized as being formatted in NTSF, while the other unit raid 0 (ichr9) is recognized without problems?
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Mar 11, 2010
I have 4 hard disks. 2 pair of RAID 1 (mirror). Both use the same RAID controller - Intel Marvell.When I boot, this is what is listed in /dev/mapper/:
Code:
crw-rw---- 1 root root 10, 59 2010-03-11 20:58 control
brw------- 1 root root 252, 0 2010-03-11 20:58 isw_bbjfjjdcg_Volume0
[code]...
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Feb 11, 2010
The RAID level 1 interested me because of its redundancy in both drives. And I successfully made it in a couple of partitions. But, I always did it after Linux installation. Then, I create both partitions, use 'mdadm' to create raidtab and RAID device (md0, for example) and then I format the RAID device with 'mkfs' and mount it.
Until there, it's all OK.
But my problem is to mirror ALL the hard disk, inclusive root partition. To do that, I guess I need no Linux installation, then create the RAID (md0, raidtab, etc) and after that install Linux in RAID device created.
But I'm new in Linux world and I have no idea how to do that.
I use Debian Lenny, so I need a solution that uses only the first DVD of this distribution.
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Aug 11, 2009
This might be a longshot but i used to use the 4 bay NAS here Which formated the HDD JBOD array to EXT2 , Anyway i want to move to an 8 bay DAS now but i cant find an application to convert the partitions .
Partition magic says the partitions are unformatted and the partition id is set to linux raid auto . Is there any way to convert this partition to vanilla EXT2 so i can use partition magic on it ? Its a 4TB array so copying isnt possible.
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Jan 6, 2010
I'm building a NAS, based on the Intel SS4200. There are 4 drive bays in the machine for use with SATA disks, two of which I plan on filling now, the other two which I plan on filling later. The box also includes an IDE connector to which I will connect an 8GB Disk on Module onto which I will install Slackware. I wish to have all drives in the box show up as one contiguous volume. What partitioning/LVM/RAID configuration can I use which will allow me to:
1. Add a disk and transparently grow the available space of the volume?
2. Replace a disk with a larger disk and transparently grow the available space of the volume?
3. Lose a disk to hardware failure and replace it with a new one with no data loss?
If I use RAID 5, I'm pretty certain I can get numbers 1 and 3 above, but I'm not sure about number 2. The downside is that I'd have to start with 3 disks in the machine, and I'm unsure if adding a 4th disk whose size is larger than each of the 3 starting disks would lead to wasted space. For instance, if I start with three 1TB drives in RAID 5, and then add a 2TB 4th drive, would my available size go from 2TB to 3TB? Or from 2TB to 3.xTB?
Is it important in a RAID 5 setup to have all disks the same size? With LVM, I can certainly get number 1 above, but what about 2 and 3? I know you can use LVM to present many disks or partitions as one contiguous volume, but if I have two 1TB drives in one volume, and only have 300GB of data, then would the second drive remain empty until I broke the 1TB barrier? In this case, it's wasted space from the get go. I suppose another option would be to start with RAID 1 until I can afford a third disk.
When adding the new disk, could I switch to RAID 5 without data loss? I'm planning on maintaining a full mirror of the NAS on some USB disks as a backup, so if configuration changes to the NAS require wiping the disks and restoring from backup, it's not a total loss. However, it certainly makes me nervous to be in a state where only one copy of the data exists, so I'd rather find a solution where I can add and upgrade disks in the NAS without relying on the backup copies.
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