howdy.
I've recently started testing RAID6 on a Promise SATA150 TX4, using
the controller as a pure SATA-controller and running software RAID
over the four drives connected to it. the kernel is 2.6.8.1-mm4.
the drives are all identical, WD2500JD-00H.
I've fiddled a bit with testing the array, setting drives as faulty
and removing them, only to reinsert them afterwards. there were no
complaints from the system while doing these trials, and everything
looked good. my md was then turned into a PV and added to a VG.
all was seemingly well. I probably created the PV while the system
was doing the initial sync of the RAIDset, I am however unsure if
that should cause any problems as the pvcreate didn't report any
errors from the block device.
I then created two LVs and copied data from the network onto one of
the LVs while a recovery was in process (the re-adding of
/dev/sdc1), which didn't report any errors. upon copying from the
recently populated LV to the blank LV however, I get a lot of I/O
errors while reading from the recently populated filesystem. I've
removed the LVs, tested different filesystems (ext3, reiserfs) but
the errors always show in the same way.
now, this isn't exactly a good thing. especially since the only
thing I see are I/O errors upon reading the data. I'm not quite
sure what I can provide to help anyone debug this, but I'm more than
willing to help with testing.
thanks for all the great md-work, and please CC me, I'm not on the
list.
gayomart:/# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5] [multipath] [raid6]
md0 : active raid6 sdc1[2] sdd1[3] sdb1[1] sda1[0]
488391808 blocks level 6, 64k chunk, algorithm 2 [4/4] [UUUU]
unused devices: <none>
gayomart:/# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90.01
Creation Time : Thu Sep 2 22:00:49 2004
Raid Level : raid6
Array Size : 488391808 (465.77 GiB 500.11 GB)
Device Size : 244195904 (232.88 GiB 250.06 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Fri Sep 3 14:07:43 2004
State : clean, no-errors
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc1
3 8 49 3 active sync /dev/sdd1
UUID : a9b70f65:e3d7bda8:a0a37b4d:4ae0aab1
Events : 0.1835
--
Terje
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