Dear RAID users,
I have a root raid 1 fileserver using 2 120 IDE disk and a standard Redhat
2.4.20 kernel
Two days ago I discovered that one of my raid partition failed:
====== From my logs ============
Aug 15 23:00:05 mekare kernel: hdc: dma_intr: status=0x51 { DriveReady
SeekComplete Error }
Aug 15 23:00:05 mekare kernel: hdc: dma_intr: error=0x40
UncorrectableError }, LBAsect=73785359, sector=64487504
Aug 15 23:00:05 mekare kernel: end_request: I/O error, dev 16:06 (hdc),
sector 64487504
Aug 15 23:00:05 mekare kernel: raid1: Disk failure on hdc6, disabling
device.
Aug 15 23:00:05 mekare kernel: ^IOperation continuing on 1 devices
Aug 15 23:00:05 mekare kernel: raid1: hdc6: rescheduling block 64487504
Aug 15 23:00:05 mekare kernel: md: updating md0 RAID superblock on device
Aug 15 23:00:05 mekare kernel: md: hda6 [events: 0000001d]<6>(write) hda6's
sb offset: 115411840
Aug 15 23:00:05 mekare kernel: md: recovery thread got woken up ...
Aug 15 23:00:05 mekare kernel: md0: no spare disk to reconstruct array! --
continuing in degraded mode
Aug 15 23:00:05 mekare kernel: md: recovery thread finished ...
Aug 15 23:00:05 mekare kernel: md: (skipping faulty hdc6 )
Aug 15 23:00:05 mekare kernel: raid1: hda6: redirecting sector 64487504 to
another mirror
============================
hda6 and hdc6 are my fileserver partition using RAID1 as md0.
Others partitions on hdc seem to work fine.
====== From /etc/raidtab ==========
[.....skip....]
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
nr-spare-disks 0
device /dev/hda6
raid-disk 0
device /dev/hdc6
raid-disk 1
[....skip.....]
=============================
========From /proc/mdstat=========
Personalities : [raid1]
read_ahead 1024 sectors
md0 : active raid1 hda6[0] hdc6[1](F)
115411840 blocks [2/1] [U_]
md2 : active raid1 hda5[0] hdc5[1]
532608 blocks [2/2] [UU]
md1 : active raid1 hda3[0] hdc3[1]
2047680 blocks [2/2] [UU]
md3 : active raid1 hda2[0] hdc2[1]
2047680 blocks [2/2] [UU]
md4 : active raid1 hda1[0] hdc1[1]
20544 blocks [2/2] [UU]
unused devices: <none>
=============================
As others hdc partitions seem to work fine, I assume there is not hardware
problem with hdc.
So I tried to reinsert hdc6 to md0 with: raidhotadd -a /dev/md0 /dev/hdc6
but I get the following error:
/dev/md0: can not hot-add disk: disk busy!
What do you thing of this problem ? Is this an hardware problem ?
How can I reinsert hdc6 without stopping the raid array (the fileserver is
currently in production).
Thanks a lot for your answer and sorry for this long email.
--
Mikael Chambon
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