Re: Need some information and help on mdadm in order to support it on IBM z Systems | |
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Hello Bill,
the scenario actually involves simulating a hardware connection issue for
a few seconds and bring it back online. But once the hardware comes back
online it is still do not come back into the array an remains marked
"faulty spare". Moreover, if you then reboot, the mirror comes up and you
can mount it but it is degraded and my "faulty spare" is now removed:
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 17 1 active sync /dev/sdb1
Is there a way maybe using a udev rule to mark the device clean so it can
be readded automatically into the array ?
Best regards / Mit freundlichen Gruessen / Cordialement / Cordiali Saluti
Jean-Baptiste Joret - Linux on System Z
Phone: +49 7031 16-3278 / ITN: 39203278 - eMail: joret@xxxxxxxxxx
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschäftsführung: Herbert Kircher
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
From:
Bill Davidsen <davidsen@xxxxxxx>
To:
Jean-Baptiste Joret/Germany/IBM@IBMDE, Linux RAID
<linux-raid@xxxxxxxxxxxxxxx>
Date:
15.04.2008 20:50
Subject:
Re: Need some information and help on mdadm in order to support it on IBM
z Systems
I have added the list back into the addresses, you can use "reply all" to
keep the discussion where folks can easily contribute.
Jean-Baptiste Joret wrote:
Hi Bill,
I have created the array with "mdadm --create /dev/md0 --level=1
--raid-devices=2 /dev/dasd[ef]1 --metadata=1.2 --bitmap=internal" using as
you can see version 1.2 of the Metatata format. The Kernel ist the SuSE
standard kernel 2.6.16.60-0.9-default on s390x (SLES 10 SP2 RC1). I have
this issue with RC2 too.
What I would like to have a more documentation about the Metadata and how
they are used if you have or know someone who can provide this.
The best (only) description of the metadata is in the md portion of the
kernel or in the mdadm source code. I am guessing that there is a fix for
your problem in more recent kernels, since a similar thing was mentioned
on the mailing list recently. Older versions of the kernel require some
event to start the rebuild, at which point the spare will be put back into
the array. Unfortunately I didn't find it quickly, although memory tells
me that it has been fixed in the latest kernel.
I think you need to look carefully at any hardware or connection issues
which cause the device to drop out of the array in the first place. The
fact that it comes in as a faulty spare indicates a problem, but I don't
quite see what that is. Your remove and reinsert will get it going again,
is it possible that the devices is not ready at boot time for some reason?
There may be log messages from the time when the drive was kicked from
that array which will tell you more.
Thank you in advance.
Best regards / Mit freundlichen Gruessen / Cordialement / Cordiali Saluti
Jean-Baptiste Joret - Linux on System Z
Phone: +49 7031 16-3278 / ITN: 39203278 - eMail: joret@xxxxxxxxxx
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschäftsführung: Herbert Kircher
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
From:
Bill Davidsen <davidsen@xxxxxxx>
To:
Jean-Baptiste Joret/Germany/IBM@IBMDE
Cc:
linux-raid@xxxxxxxxxxxxxxx
Date:
11.04.2008 16:35
Subject:
Re: Need some information and help on mdadm in order to support it on IBM
z Systems
Jean-Baptiste Joret wrote:
Hello,
I am trying to obtain information such as design document or anything
that
would describe the content of the metadata. I am evaluating the solution
to determinate whether it is entreprise ready for use as a mirror
solution
and if we can support it at IBM.
Also I am currently having quite a show stopper issue, where help would
be
appreciated. I have a RAID1 with 2 Harddisks, when I remove one hardisk
(I
put the chpids offline which is equivalent to telling the system that
the
drive is currently not available), the missing disk is marked as "faulty
spare" when calling mdadm -D /dev/md0.
/dev/md0:
Version : 01.02.03
Creation Time : Fri Apr 11 11:11:59 2008
Raid Level : raid1
Array Size : 2403972 (2.29 GiB 2.46 GB)
Used Dev Size : 2403972 (2.29 GiB 2.46 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Fri Apr 11 11:23:04 2008
State : active, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 1
Spare Devices : 0
Name : 0
UUID : 9a0a6e30:4b8bbe7f:bc0cad81:9fd46804
Events : 8
Number Major Minor RaidDevice State
0 0 0 0 removed
1 94 21 1 active sync /dev/dasdf1
0 94 17 - faulty spare /dev/dasde1
When I put the disk back online it is not automatically reinserted into
the array. The only thing that I have tried that worked was to do a hot
remove followed by a hot add (mdadm /dev/md0 -r /dev/dasde1 and then
mdadm
/dev/md0 -a /dev/dasde1). Is that the correct way or is there any option
to tell the disk is back an clean ? I don't like my solution verymuch as
somtimes I get an error saying the superblock cannot be written.
Thank you very much for any help you can provide.
Start by detailing the versions of the kernel, mdadm, which superblock
you use, and your bitmap configuration (or lack of it).
Best regards / Mit freundlichen Gruessen / Cordialement / Cordiali
Saluti
Jean-Baptiste Joret - Linux on System Z
Phone: +49 7031 16-3278 / ITN: 39203278 - eMail: joret@xxxxxxxxxx
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschäftsführung: Herbert Kircher
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
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Bill Davidsen <davidsen@xxxxxxx>
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