Raid1 problem

[Todor Andreev]

On Thursday 28 August 2008 16:08:07 Mark Haney wrote:
> Todor Andreev wrote:
> > Hi all,
> > I am ... let's say a sys admin, and I have this little problem every time
> > I build a mirror with mdadm. I build it by the ubuntu install and there
> > come the problems. The ubuntu version is 8.04.1, but it happens with 7.10
> > too. I am a little scared about the data on this raid because i use it
> > everywhere. So this is the exact problem: install, configure raid1 with
> > sda,sdb and the folowing message appears on random basis at the start up
> > screen (this is from the syslog file but the same is shown at the start).
> >
> > md: md0 stopped.
> > Aug 25 09:52:54 SupportivoFileserver kernel: [ 36.004675] md: invalid
> > raid superblock magic on sda
> > Aug 25 09:52:54 SupportivoFileserver kernel: [ 36.004722] md: sda does
> > not have a valid v0.90 superblock, not importing!
> > Aug 25 09:52:54 SupportivoFileserver kernel: [ 36.004728] md:
> > md_import_device returned -22
> > Aug 25 09:52:54 SupportivoFileserver kernel: [ 36.004960] md: bind<sda2>
> > Aug 25 09:52:54 SupportivoFileserver kernel: [ 36.078227] md: md0
> > stopped.
> >
> > After a huge research I didn't find any solution, except that the
> > metadata has to be set to v0.90 so the kernel could work properly. I
> > checked the version and it IS 0.90. I put it also in the mdadm.conf file
> > as a declaration but with no result. I switched the motherboard, assuming
> > it could be the chipset/driver issue, I switched the PSU but with no
> > result. Tested all the HDDs with Seatools and no problems (also they are
> > almost new). I have no ideas what is happening. I would be very grateful
> > if you help me with this! Thanks!
>
> First question.  Are the drives identical?
>
> --
> Libenter homines id quod volunt credunt -- Caius Julius Caesar
>
>
> Mark Haney
> Sr. Systems Administrator
> ERC Broadband
> (828) 350-2415
>
> Call (866) ERC-7110 for after hours support

They are not identical, but the same happens with identical drives. This is 
it:
root at Fileserver:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 8.4G 637M 7.8G 8% /
varrun 252M 200K 252M 1% /var/run
varlock 252M 0 252M 0% /var/lock
udev 252M 80K 252M 1% /dev
devshm 252M 0 252M 0% /dev/shm
/dev/md0 140G 85G 56G 61% /home
/dev/md1 466G 33M 466G 1% /media/mirror500
/dev/sde1 299G 33M 299G 1% /media/wd320

root at Fileserver:~# fdisk -l /dev/sda

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x02820282

Device Boot Start End Blocks Id System
/dev/sda1 * 1 1094 8787523+ 83 Linux
/dev/sda2 1095 19330 146480670 fd Linux raid autodetect
/dev/sda3 19331 19457 1020127+ 82 Linux swap / Solaris

root at Fileserver:~# fdisk -l /dev/sdb

Disk /dev/sdb: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x29cd29cc

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 1094 8787523+ 83 Linux
/dev/sdb2 1095 19330 146480670 fd Linux raid autodetect
/dev/sdb3 19331 19457 1020127+ 82 Linux swap / Solaris

root at Fileserver:~# mdadm -D /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Sat May 17 17:07:06 2008
Raid Level : raid1
Array Size : 146480576 (139.69 GiB 150.00 GB)
Used Dev Size : 146480576 (139.69 GiB 150.00 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Tue Aug 26 09:04:51 2008
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

UUID : 238bedb9:81c82c3b:ab7016b1:7c803cea
Events : 0.36

Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2

root at Fileserver:~# mdadm --examine /dev/sda2
/dev/sda2:
Magic : a92b4efc
Version : 00.90.00
UUID : 238bedb9:81c82c3b:ab7016b1:7c803cea
Creation Time : Sat May 17 17:07:06 2008
Raid Level : raid1
Used Dev Size : 146480576 (139.69 GiB 150.00 GB)
Array Size : 146480576 (139.69 GiB 150.00 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0

Update Time : Tue Aug 26 09:06:34 2008
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : 100d5f30 - correct
Events : 0.36


Number Major Minor RaidDevice State
this 0 8 2 0 active sync /dev/sda2

0 0 8 2 0 active sync /dev/sda2
1 1 8 18 1 active sync /dev/sdb2
root at Fileserver:~# sudo mdadm --examine /dev/sdb2
/dev/sdb2:
Magic : a92b4efc
Version : 00.90.00
UUID : 238bedb9:81c82c3b:ab7016b1:7c803cea
Creation Time : Sat May 17 17:07:06 2008
Raid Level : raid1
Used Dev Size : 146480576 (139.69 GiB 150.00 GB)
Array Size : 146480576 (139.69 GiB 150.00 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0

Update Time : Tue Aug 26 09:06:34 2008
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : 100d5f42 - correct
Events : 0.36


Number Major Minor RaidDevice State
this 1 8 18 1 active sync /dev/sdb2

0 0 8 2 0 active sync /dev/sda2
1 1 8 18 1 active sync /dev/sdb2
Thanks for the reply!

The only difference is that the one is PATA the other is SATA in the md0 
volume.