I've got a CentOS 4.8 system running software RAID1 on an identical pair
of PATA drives. At some point in the recent past, the system rebooted
unexpectedly, and the two RAID1 devices degraded. When trying to
mdadm /dev/md0 -a /dev/hde1
I get
mdadm: hot add failed for /dev/hde1: Invalid argument
and from the kernel,
md: could not bd_claim hde1.
md: error, md_import_device() returned -16
The same happens when trying to add hde3 back to md1. The googling I've
done suggests this is because something has these hde devices open.
They're not mounted. LVM is not in use. Nothing that I can find is using
these devices. The system has been properly shut down a number of times
since the arrays went degraded, but the errors we get when trying to readd
the missing devices has not changed.
# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90.01
Creation Time : Wed Mar 23 15:49:58 2005
Raid Level : raid1
Array Size : 38547840 (36.76 GiB 39.47 GB)
Device Size : 38547840 (36.76 GiB 39.47 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Sat Oct 10 23:31:50 2009
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Number Major Minor RaidDevice State
0 0 0 -1 removed
1 34 1 1 active sync /dev/hdg1
UUID : e5f38941:e40733ec:4b761dd4:cdc8f141
Events : 0.60067904
Short of booting from some form of rescue image, and trying to readd the
missing devices (and then waiting for synchronization before putting the
machine back in service) is there anything worth trying to get the arrays
back in sync?
Disk /dev/hde: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hde1 * 1 4799 38547936 fd Linux raid autodetect
/dev/hde2 4800 4930 1052257+ 82 Linux swap
/dev/hde3 4931 9729 38547967+ fd Linux raid autodetect
Disk /dev/hdg: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hdg1 * 1 4799 38547936 fd Linux raid autodetect
/dev/hdg2 4800 4930 1052257+ 82 Linux swap
/dev/hdg3 4931 9729 38547967+ fd Linux raid autodetect
----------------------------------------------------------------------
Jon Lewis | I route
Senior Network Engineer | therefore you are
Atlantic Net |
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
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