I've inheritted responsibility for a server with a root raid1 that
degrades every time the system is rebooted. It's a 2.4.x kernel. I've
got both raidutils and mdadm available.
The raid1 device is supposed to be /dev/hde1 & /dev/hdg1 with /dev/hdc1 as
a spare. I believe it was created with raidutils and the following
portion of /etc/raidtab:
raiddev /dev/md1
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
nr-spare-disks 1
device /dev/hde1
raid-disk 0
device /dev/hdg1
raid-disk 1
device /dev/hdc1
spare-disk 0
The output of mdadm -E concerns me though.
# mdadm -E /dev/hdc1
/dev/hdc1:
Magic : a92b4efc
Version : 00.90.00
UUID : 8b65fa52:21176cc9:cbb74149:c418b5a4
Creation Time : Tue Jan 13 13:21:41 2004
Raid Level : raid1
Device Size : 30716160 (29.29 GiB 31.45 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 1
Update Time : Thu Aug 11 08:38:59 2005
State : dirty, no-errors
Active Devices : 2
Working Devices : 2
Failed Devices : -1
Spare Devices : 0
Checksum : 6a4dddb8 - correct
Events : 0.195
Number Major Minor RaidDevice State
this 1 22 1 1 active sync /dev/hdc1
0 0 33 1 0 active sync /dev/hde1
1 1 22 1 1 active sync /dev/hdc1
# mdadm -E /dev/hde1
/dev/hde1:
Magic : a92b4efc
Version : 00.90.00
UUID : 8b65fa52:21176cc9:cbb74149:c418b5a4
Creation Time : Tue Jan 13 13:21:41 2004
Raid Level : raid1
Device Size : 30716160 (29.29 GiB 31.45 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 1
Update Time : Mon Aug 15 11:16:43 2005
State : dirty, no-errors
Active Devices : 2
Working Devices : 2
Failed Devices : -1
Spare Devices : 0
Checksum : 6a5348c9 - correct
Events : 0.199
Number Major Minor RaidDevice State
this 0 33 1 0 active sync /dev/hde1
0 0 33 1 0 active sync /dev/hde1
1 1 34 1 1 active sync /dev/hdg1
# mdadm -E /dev/hdg1
/dev/hdg1:
Magic : a92b4efc
Version : 00.90.00
UUID : 8b65fa52:21176cc9:cbb74149:c418b5a4
Creation Time : Tue Jan 13 13:21:41 2004
Raid Level : raid1
Device Size : 30716160 (29.29 GiB 31.45 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 1
Update Time : Mon Aug 15 11:16:43 2005
State : dirty, no-errors
Active Devices : 2
Working Devices : 2
Failed Devices : -1
Spare Devices : 0
Checksum : 6a5348cc - correct
Events : 0.199
Number Major Minor RaidDevice State
this 1 34 1 1 active sync /dev/hdg1
0 0 33 1 0 active sync /dev/hde1
1 1 34 1 1 active sync /dev/hdg1
Shouldn't total devices be at least 2? How can failed devices be -1?
When the system reboots, md1 becomes just /dev/hdc1. I've used mdadm to
add hde1, fail and then remove hdc1, and add hdg1. How can I repair the
array such that it will survive the next reboot and keep hde1 and hdg1 as
the working devices?
md1 : active raid1 hdg1[1] hde1[0]
30716160 blocks [2/2] [UU]
----------------------------------------------------------------------
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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