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#1: always dirty RAID5 arrays

Posted on 2004-11-09 22:03:24 by Scott Ransom

Hi All,

On one of our servers we have 4 6-disk RAID5 arrays running. Each of the
arrays was created using the following command:

mdadm --create /dev/md3 --level=5 --verbose --force --chunk=128 \
--raid-devices=6 /dev/sd[ijklmn]1

After building and a resync (and a reboot and a resync...), the array looks
like this:

--------------------------------------------
spigot2 sransom 84: mdadm --detail /dev/md3
/dev/md3:
Version : 00.90.00
Creation Time : Tue Sep 21 15:54:31 2004
Raid Level : raid5
Array Size : 1220979200 (1164.42 GiB 1250.28 GB)
Device Size : 244195840 (232.88 GiB 250.06 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 3
Persistence : Superblock is persistent

Update Time : Sat Nov 6 10:58:12 2004
State : dirty
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 128K

UUID : 264b9069:96d7a1a6:d3b17be5:23fa47ce
Events : 0.30

Number Major Minor RaidDevice State
0 8 129 0 active sync /dev/sdi1
1 8 145 1 active sync /dev/sdj1
2 8 161 2 active sync /dev/sdk1
3 8 177 3 active sync /dev/sdl1
4 8 193 4 active sync /dev/sdm1
5 8 209 5 active sync /dev/sdn1
------------------------------------------------------------ -----


Notice that the State is "dirty". If we reboot, the arrays are in a dirty
status and always need to resync. Any idea why would this be? (I'm
running XFS on the RAIDs and am using a slightly modified RH9.0 kernel:
2.4.24aa1-xfs)

Thanks for the help,

Scott

--
Scott M. Ransom Address: NRAO
Phone: (434) 296-0320 520 Edgemont Rd.
email: sransom@nrao.edu Charlottesville, VA 22903 USA
GPG Fingerprint: 06A9 9553 78BE 16DB 407B FFCA 9BFA B6FF FFD3 2989
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#2: RE: always dirty RAID5 arrays

Posted on 2004-11-09 23:27:10 by bugzilla

Dirty does not indicate a re-sync is needed, just that changes have
occurred. If the array were shutdown incorrectly (like a crash) then on
re-start a re-build of parity would be done.

For more details:
man md

Guy

-----Original Message-----
From: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org] On Behalf Of Scott Ransom
Sent: Tuesday, November 09, 2004 4:03 PM
To: linux-raid@vger.kernel.org
Cc: sransom@nrao.edu
Subject: always dirty RAID5 arrays

Hi All,

On one of our servers we have 4 6-disk RAID5 arrays running. Each of the
arrays was created using the following command:

mdadm --create /dev/md3 --level=5 --verbose --force --chunk=128 \
--raid-devices=6 /dev/sd[ijklmn]1

After building and a resync (and a reboot and a resync...), the array looks
like this:

--------------------------------------------
spigot2 sransom 84: mdadm --detail /dev/md3
/dev/md3:
Version : 00.90.00
Creation Time : Tue Sep 21 15:54:31 2004
Raid Level : raid5
Array Size : 1220979200 (1164.42 GiB 1250.28 GB)
Device Size : 244195840 (232.88 GiB 250.06 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 3
Persistence : Superblock is persistent

Update Time : Sat Nov 6 10:58:12 2004
State : dirty
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 128K

UUID : 264b9069:96d7a1a6:d3b17be5:23fa47ce
Events : 0.30

Number Major Minor RaidDevice State
0 8 129 0 active sync /dev/sdi1
1 8 145 1 active sync /dev/sdj1
2 8 161 2 active sync /dev/sdk1
3 8 177 3 active sync /dev/sdl1
4 8 193 4 active sync /dev/sdm1
5 8 209 5 active sync /dev/sdn1
------------------------------------------------------------ -----


Notice that the State is "dirty". If we reboot, the arrays are in a dirty
status and always need to resync. Any idea why would this be? (I'm
running XFS on the RAIDs and am using a slightly modified RH9.0 kernel:
2.4.24aa1-xfs)

Thanks for the help,

Scott

--
Scott M. Ransom Address: NRAO
Phone: (434) 296-0320 520 Edgemont Rd.
email: sransom@nrao.edu Charlottesville, VA 22903 USA
GPG Fingerprint: 06A9 9553 78BE 16DB 407B FFCA 9BFA B6FF FFD3 2989
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html

-
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