Fedora :: Lost Mdadm Superblock But Not Drives / Can Rebuild Software RAID5?
Jan 25, 2010
I have an old Athlon XP 3000 machine that I keep around as a file server.It's currently got three 1TB drives which I had setup as mdadm raid 5 on FC10. The machine's original drive held the superblock for the raid array and it just had a massive heart attack. I've searched, my biggest source being URL...I can't tell if I can reassemble the superblock info lost with the original hard drive or if I've lost it all...
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Apr 24, 2011
Its from a Synology Box with 3 disks, which one is damaged. But this disk wasnt in use.Take a look on the raid-size of 493 GB - and the both available disks with 250GB..)
On the others there were a linear raid. during this damaged disk the synology-device tells me, that the volume was crashed.But it look like, that this disk was not mounted into this volume.Quote:
DiskStation> mdadm --detail /dev/md2
/dev/md2:
Version : 00.90
[code]....
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Feb 18, 2011
I am getting really frustrated with trying to get my RAID5 working again. I had a RAID5 array built with 4 of the Western Digital 1.5tb "Advanced Format" drives, WD15EARS. However, when copying 1.5gb dvd encoded files to the drive, I was getting speeds of ~2mb/s. When researching how to make this faster, I came across all the posts about the Advanced Format drives and how that was causing a lot of issues for a lot of people. It looked like the solution was simple enough: partition starting at sector 64 or 2048 or whatever and then recreate the RAID. However, this is not working for me.
Here are my computer specs:
Motherboard: Gigabyte GA-EP43-DS3L LGA 775 Intel P43 ATX
CPU: Intel Core 2 Duo E8400 Wolfdale 3.0GHz 6MB L2 Cache LGA 775 65W
RAM: 4gb DDR2 1066 (PC2 8500)
Video card: ASUS GeForce 9600GT 512MB 256-bit
Linux: 10.04
[Code].....
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Jun 30, 2011
I know you can fail and then remove a drive from a RAID5 array. This leaves the array in a degraded state.
How can you remove a drive and convert the array to just a regular, clean array?
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Aug 10, 2010
I need to restore a superblock on a RAID5 software array. But I'm not sure if I'm meant to restore it from MD0 or a device such as SDA1? From what I read, superblocks are stored on each drive, but I'm not sure if this is changed when a software raid is in use.
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Jul 8, 2011
I have software raid 5 array, each time I reboot my server, I have to rebuild array again. Rebuilding array takes too long. I am using ubuntu server 10.10.
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Apr 5, 2011
I bought a disk to a friend that used it in a raid array, using the entire disk for the raid usage. To put that disk on service, i used dd-rescue to copy my old disk entirely, and managed to grow and setup a the partition table without losing any data. My last step was to create a RAID between my entire old disk, with a single partition and a partition of the same size on my new disk. I ran into some problems, but i manage to somehow fix it imperfectly, but now this setup is working properly. The problems (and imperfection) came from an issue it did not suspected : at some point, the original RAID superblock of the new disk, living in /dev/sda, resisted to dd-rescue, and so it is scanned by mdadm that tries, obviously unsuccessfully, to use it.
Partition layout :
Code:
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
[code]....
this setup is working properly besides this raid5 declared on sda, so that is shows up here and there. Since it is using the same device name that my other, proper raid setup, i don't know how to deactivate it since mdadm uses the /dev/mdx name to identify arrays.
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May 18, 2011
I have an mdadm linear array of 4 500GB drives. One of them had a few bad sectors, so I've dd'ed it to a new one (conv=noerror), and tried to start my array. Mdadm refuses, saying, "mdadm: /dev/md4 assembled from 3 drives - not enough to start the array."I had diffed different samples from different positions on the source and the mirror drive and confirmed they were identical. Checking the superblocks confirms three old drives still having their superblocks as expected, while the newly mirrored one has,
daniel@lnxsrv:~$ sudo mdadm --misc --examine /dev/sdf1
mdadm: No md superblock detected on /dev/sdf1.
- and,
daniel@lnxsrv:~$ sudo blkid /dev/sdf1
[code]....
As before. The mirror apparently has no uuid, but the original does. To confirm my sanity, I did,
daniel@lnxsrv:~$ sudo dd bs=1M count=50 if=/dev/sdc of=./sdc && sudo dd bs=1M count=50 if=/dev/sdd of=./sdd && sudo diff -s sdc sdd
50+0 records in
[code]...
How can the uuid not be the same when bit-for-bit from the very first byte of the drive, covering MFT etc., these two drives are identical according to diff?
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Feb 1, 2011
My home-backup server, with 8*2TB disks won't boot anymore. Two disks failed at the same time and i rebuilt the raid 6 array without any problem, but now i can't boot the os. I'm using ubuntu server, 10.10. I've made screens of the displays to don't copy everything here. The problem at the boot:
And the Grub config: It's not a production server, but i would like to have it online. I've tried for the lasts 2 days (just a couple hours a day) but without success. I was suggested to do "mount -o remount,rw /" and than edit /etc/fstab, but it get the file don't exist error.
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Aug 26, 2010
I am writing as yesterday, my fourth hard drive within 2 years crashed. Is that normal? One was crashing 2 years ago, one in winter 2009 and 2 just within 2 weeks. What can be the reason for so many crashes? I heard maybe the power supply? How can I find out if that's broken? The voltages at least in BIOS seem normal. The SATA controller? How do I know if its broken? Can I just but one PCI-E card with SATA adapters? Is it the motherboard? Theres not much more in my computer... As well, its wired that my good-old 160 GB drive never crashed, only constantly the bigger ones. Here some typical error code from mount and dmesg:
Code: mount: wrong fs type, bad option, bad superblock on /dev/sdb2, missing codepage or helper program, or other error
ata2.00: status: { DRDY ERR }
ata2.00: error: { UNC }
ata2.00: configured for UDMA/133
ata2: EH complete
ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata2.00: BMDMA stat 0x4
[Code]....
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Jul 18, 2011
Code:
$cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
[code]....
1/4 of my drives died after about 3 years of usage. I replaced it with an identical drive and did a mdadm -add to re-add it to the array. I expected this to take quite a long time, but not more than 1 million minutes to complete!
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Jun 14, 2011
I cant seem to get my RAID 5 (consisting of 8 1tb hard drives) assembled for some reason and I have no idea why and cant find any solutions online. Ill go ahead and show what my problem is:
here is all my hard drives:
Code:
server:~$ sudo fdisk -l
Disk /dev/sda: 10.2 GB, 10242892800 bytes
255 heads, 63 sectors/track, 1245 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0004f041
[Code]....
So as you can see the array for those last four look fine however for the first four it marks the last four drives as faulty for some reason. I am kind of clueless to do from this point on honestly, I have data on this array that I'd really like to save.
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May 3, 2010
Created my own file server/nas, but get stuck in a problem after couple of months. I have a server with 4x 1,5tb disks, all connected to sata ports and 1 40gb ata133 disk running ubuntu 9.10 x64 amd. I've created a raid5 array using mdadm. It all worked great for couple of months but lately the raid5 array is degraded. disk sdd1 is faulting every few days. I have checked the drive but it is fine. If I re-add the disk and wait for 6 hours my raid5 array is all fine again, but after a few shutdowns, it is degraded.
my mdadm detail:
Quote:
root@ubuntu: sudo mdadm --detail /dev/md0
/dev/md0:
Version : 00.90
Creation Time : Mon Dec 14 13:00:43 2009
Raid Level : raid5
[Code].....
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Nov 2, 2010
I have ubuntu server 10.04 on a server with 2.8ghz 1gb ddr2 with the os on a 2gb cf card attached to the IDE channel and a software raid5 with 4 x 750gb drives. On a samba share using these drives I am only getting around 5 MB/s connected via wireless N at 216mbps and my router and server both having gigabit ports. Is a raid 5 supposed to be that slow? I was seeing speeds of anywhere from 20-50MB/s from other people and am just wondering what i am doing wrong to be so far below that.
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Mar 6, 2010
i was adding another disk to my raid 5, all was going well it started the reshape, got past the critical zone, worked for 20mins, but now it seems to have crashed.When i cat /proc/mdstat, or mdadm -D /dev/md0, those programes hang and dont print anything or return.from my kern.log i can see that there was an error on a disk, the raid array removed it, was going to continue the reshape but finished immediately. Anyone know what i should do?
Mar 6 16:20:26 Aries kernel: [1931119.599107] md: reshape of RAID array md0
Mar 6 16:20:26 Aries kernel: [1931119.599107] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
Mar 6 16:20:26 Aries kernel: [1931119.599107] md: using maximum available idle IO bandwidth (but not more
[code]....
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Jul 27, 2010
after a failed upgrade from 9.10 to 10.04 I had to format my computer and do a clean install of 10.04, and now my mdadm raid5 array wont start.my array is called "The Library", and i believe the space between "The" and "Library" is causing the command disk utility uses to start the array to fail.The exact error isAn error occurred while performing an operation on "The Library" (RAID-5 Array): The operation failed
Error assembling array: mdadm exited with exit code 1: mdadm: unrecognised word on ARRAY line: Library
mdadm: unrecognised word on ARRAY line: Library
[code]....
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May 13, 2011
My fileserver initially had 3 1TB drives in RAID 5 configured with mdadm as /dev/md1. (System root is a mirrored raid on /dev/md0) I went to go add a 4th 1TB drive to /dev/md1 and grow the raid 5 accordingly. I was initially following this guide: [URL] but ran into issues on the 3rd and 4th commands. I've been trying a few things to remedy the issue since, but no luck. The drive seems to have been added to /dev/md1 properly, but I can't get the filesystem to resize to 3TB. I also am not entirely sure how /dev/md1p1 got created, but it appears to be the primary partition on the logical device /dev/md1.
Relevent information:
Code:
fdisk -l /dev/md1
Disk /dev/md1: 3000.6 GB, 3000606523392 bytes
2 heads, 4 sectors/track, 732569952 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 65536 bytes / 196608 bytes
Disk identifier: 0xda4939fa .....
The filesystem originated as ext3, I believe its showing up as ext2 in some of these results because I disabled the journal when doing some initial troubleshooting. Not sure what the issue is, but I didn't want to blindly perform operations on the filesystem and risk losing my data.
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Jul 19, 2011
This is the error message I'm getting when trying to Format the mdadm RAID5 created with 4 drives
Code:
Error creating partition: helper exited with exit code 1: In part_add_partition: device_file=/dev/md1, start=0, size=6001196531712, type=
Entering MS-DOS parser (offset=0, size=6001196531712)
MSDOS_MAGIC found
found partition type 0xee => protective MBR for GPT
Exiting MS-DOS parser
[Code]...
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Jun 21, 2011
I've been playing with this for hours, and have been unable to figure it out. I tried to convert my RAID5 array of 4 active disks and 1 spare to a RAID6 with 5 active disks.
I did this:
Code:
mdadm --grow /dev/md4 --raid-devices 5 --level 6
Here is what I have on /dev/md4:
Code:
/dev/sde1 active
/dev/sdg1 active
/dev/sdj1 active
/dev/sdf1 active
removed
/dev/sdh5 spare
code....
but it tells me that /dev/sde is busy, and then that it has a bad superblock (From what I've read, I'm sure the bad superblock is just because of the "busy" message). I've tried this with the -f option, too, with no luck.
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Feb 15, 2010
I have a problem with my mdadm RAID. I wanted to know if anyone had any experience with shrinking RAID5 arrays. I was growing the array from 5 to 6 devices however the grow got interrupted and it has recovered to 5 drives. The 6th drive is toast and I am unable to re add it to the system. I would like to drive the device listed as "removed". I have tried mdadm /dev/md0 --remove detached and failed with no success. I am running Ubuntu kernel 2.6.28-11 and mdadm is v3.1.1.
Here is output of a "mdadm -D dev/md0"
/dev/md0:
Version : 0.90
Creation Time : Wed Jan 12 00:46:41 2009
Raid Level : raid5
Array Size : 4883812480 (4657.57 GiB 5001.02 GB)
Used Dev Size : 976762496 (931.51 GiB 1000.20 GB)
Raid Devices : 6
Total Devices : 5
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon Feb 15 20:25:07 2010
State : active, degraded
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 74fa5199:84b88e81:4ae0fbae:92643084
Events : 0.1331010
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
1 8 32 1 active sync /dev/sdc
2 8 48 2 active sync /dev/sdd
3 8 0 3 active sync /dev/sda
4 8 64 4 active sync /dev/sde
5 0 0 5 removed
cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdb[0] sde[4] sda[3] sdd[2] sdc[1]
4883812480 blocks level 5, 64k chunk, algorithm 2 [6/5] [UUUUU_]
unused devices: <none>
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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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Jan 17, 2011
Relatively inexperienced user using Linux/ubuntu. Not too savvy I admit and like to use GUI as much as possible. Not a great fan of the Terminal window... I have installed a couple weeks ago Ubuntu 10.10 (Desktop Edition) using Alternative install disk (don't ask why!) on 4Gb usb stick. Working fine except one thing with the raid array. I have created a raid5 array made of 6 drives using GUI (Disk Utility). After an expansion of the array (or was it a reinstall of the OS, I can't remember exactly?) the array does not autostart anymore. Of course nor does it automount anymore.
THE WEIRD THING is that I can still start it MANUALLY from the "Disk Utility" GUI after two tries. And it works just fine thereafter!!! The first time i try to start it gives an error (something about /dev/md0_127 being not ready or buisy). THE SECOND TRY ALWAYS WORKS like a charm, the array starts and i can mount it just fine. Here is a screenshot: I have also noticed that there is no entry in fstab for /dev/md0 although I can manually mount it using the same Disk Utility GUI. That is strange to me. Is it normal? i could easily add it manually but Ubuntu it won't boot anymore (i tried and failed, hence the reinstall). I tried for two weeks to find a solution browsing on different forums but the problem is beyond my expertise...
BELOW are further details about my configuration mdadm.conf, fstab, fdisk -l result and other info. I don=t want to loose my data but it would be nice to make this thing work and be able to access my fileserver via vnc instead of having to keep it connected to a lcd monitor as now. This is the blkid result:
[Code]...
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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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Mar 18, 2010
I wonder how to attach new sata hard disk to software array where are two disk and one is crashed (this is a mirroring mode=Raid 1).Situation like this:I unpluged crashed disk and I buy the similar one and plug in What Next should I do?
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Nov 21, 2010
When trying to rebuild a RAID1 on a FastTrak TX4310 controller after a disk was replaced the below message is given:
Code:
[root@SAMBA Samba]# dmraid -R pdc_gigcjhdfa /dev/sdc
Volume "pdc_gigcjhdfa" is not in rebuild state (current: 16)
Rebuild: cannot rebuild from current state!
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Aug 29, 2015
I use a usb flash stick for bootloader and /boot. Debian resides on sdaX and is LUKS encrypted (in fact LVM on LUKs). I am trying to learn how to use the Deb LIVE disk with rescue mode to re-build the bootloader and /boot on a fresh different flash drive. As a learning tool I want to approach this task as described. I have full access to a perfectly running system at this point, but I want to learn this process knowing eventually something will go "bump in the night". I did a custom install so I am aware of how this works generally speaking.
I have password access to the LUKS volume and can easily open it at the LIVE disk prompt to do so. My new flash drive is wiped and EXT2 formatted and should be ready to go. I have RAM based backup software for doing sector backups of the LUKS partition/volume. Doing a full restore at any point will be a piece of cake. I have lots of family around and the thought of a missing bootloader flash drive, while not likely, is not out of question.
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May 16, 2010
I have a 12 disk raid 6 Array with 2 additional spare drives. Two of the drives got out of sync (because I was fat fingering the mdadm commands while trying to reassemble the array), so I added them back as spares. This is what mdadm is showing me:
[Code]...
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Feb 17, 2011
One of the disks in my RAID5 arrays started acting up, giving me some I/O buffer errors and making the RAID stop. disk info
Code:
=== START OF INFORMATION SECTION ===
Device Model: WDC WD10EARS-00Y5B1
Serial Number: WD-WMAV51466805
Firmware Version: 80.00A80
[Code]...
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Jun 15, 2010
I've got 2 hard disk drives of 250GB, with this partitions :
All partitions are with format "linux raid software". I made 3 raid1 with them like that :
I want to clone them to news hdd of 500Gb, to have this partitions :
My problem, how can I resize partitions, before resize the array md2 with the command mdadm --grow /dev/md1 --size=max ?
After, how can I rebuild /dev/md2 without lost any datas ?
I'm using ubuntu-server 10.04 64bits.
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Dec 11, 2010
I have a 1TB SATA2 disk in my home Debian server. I'm planning to buy two more drives (1TB too) in order to build a RAID5. Does it make any difference if I use the SATA2 drive with two SATA3 drives? I'm getting the SATA3 with more cache (64MB) at the same price than the old one and I'm not sure if the SATA version or the cache size can impact in the normal behavior of a RAID5
[code]...
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