Ahem :-) Still replying to myself, I also found a very nice utility called lsraid, which tells us things like:
# lsraid -D -l -d /dev/hda3 -d /dev/hdb1 -d /dev/hdc1 -d /dev/hdd1
[dev 3, 3] /dev/hda3:
md version = 0.90.0
superblock uuid = CF9E6AB4.00000000.00000000.00000000
md minor number = 0
created = 974113695 (Mon Nov 13 13:08:15 2000)
last updated = 1062524544 (Tue Sep 2 20:42:24 2003)
raid level = 5
chunk size = 128 KB
apparent disk size = 78935296 KB
disks in array = 4
required disks = 4
active disks = 4
working disks = 4
failed disks = 0
spare disks = 0
position in disk list = 0
position in md device = 0
state = goodOthers are identical except for the following lines:
[dev 3, 65] /dev/hdb1:
position in disk list = 1
position in md device = 1[dev 22, 1] /dev/hdc1:
position in disk list = 2
position in md device = 2[dev 22, 65] /dev/hdd1:
position in disk list = 3
position in md device = 3Yet trying to access them via md0 causes failure:
# lsraid -D -l -a /dev/md0
lsraid: md device [dev 9, 0] /dev/md0 is offline: Please specify a disk to query
All partition types for the respective partitions are of type fd (Linux raid autodetect)
Kernel config with respect to raid stuff is as follows:
CONFIG_MD=y CONFIG_BLK_DEV_MD=y CONFIG_MD_LINEAR=m CONFIG_MD_RAID0=m CONFIG_MD_RAID1=m CONFIG_MD_RAID5=y # CONFIG_MD_MULTIPATH is not set # CONFIG_BLK_DEV_LVM is not set
All seems terribly normal - it just doesn't work :(
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