Welcome.
(This email is a copy of serverfault question
http://serverfault.com/questions/427692/mdadm-kernel-log-messages-explained,
which I guess didn't get to the right audience)
I try to recover from linux software raid failure. I am in a process of
recreating the superblocks based on a syslog from the system when it was
healthy. The log speaks about 2 md devices, each based on 5 500GB
partitions. The RAID-5 /dev/md5 is composed from /dev/sd[b-f]6 and
RAID-6 /dev/md6 is composed from /dev/sd[b-f]5. The relevant part dmesg
log is at bottom of this mail.
Questions:
# What do the numbers on the line [ 5.979771] 4: w=1 pa=0 pr=5 m=1
a=2 r=5 op1=0 op2=0 mean, including the first 4:?
# What do the numbers on the line [ 6.039266] --- rd:5 wd:5] mean?
# What do the numbers on the line [ 6.046856] disk 0, o:1, dev:sdb6
mean?
# Does the line [ 6.096768] created bitmap (15 pages) for device md5
tell anything about the place, where the bitmap is located and what is
its size?
|[ 5.964928] raid5: allocated 5265kB for md5
[ 5.979771] 4: w=1 pa=0 pr=5 m=1 a=2 r=5 op1=0 op2=0
[ 5.987064] 1: w=2 pa=0 pr=5 m=1 a=2 r=5 op1=0 op2=0
[ 5.994256] 3: w=3 pa=0 pr=5 m=1 a=2 r=5 op1=0 op2=0
[ 6.001441] 2: w=4 pa=0 pr=5 m=1 a=2 r=5 op1=0 op2=0
[ 6.008665] 0: w=5 pa=0 pr=5 m=1 a=2 r=5 op1=0 op2=0
[ 6.015883] raid5: raid level 5 set md5 active with 5 out of 5 devices, algorithm 2
[ 6.031441] RAID5 conf printout:
[ 6.039266] --- rd:5 wd:5
[ 6.046856] disk 0, o:1, dev:sdb6
[ 6.054308] disk 1, o:1, dev:sdf6
[ 6.061524] disk 2, o:1, dev:sdc6
[ 6.068667] disk 3, o:1, dev:sde6
[ 6.075774] disk 4, o:1, dev:sdd6
[ 6.089504] md5: bitmap initialized from disk: read 1/1 pages, set 0 bits
[ 6.096768] created bitmap (15 pages) for device md5
[ 6.141010] md5: detected capacity change from 0 to 1978409418752
[ 6.153794] md5: unknown partition table
[ 5.594614] raid5: device sde5 operational as raid disk 3
[ 5.599701] raid5: device sdd5 operational as raid disk 4
[ 5.604750] raid5: device sdf5 operational as raid disk 1
[ 5.609879] raid5: device sdc5 operational as raid disk 2
[ 5.615032] raid5: device sdb5 operational as raid disk 0
[ 5.621672] raid5: allocated 5265kB for md6
[ 5.627243] 3: w=1 pa=0 pr=5 m=2 a=2 r=5 op1=0 op2=0
[ 5.632846] 4: w=2 pa=0 pr=5 m=2 a=2 r=5 op1=0 op2=0
[ 5.638502] 1: w=3 pa=0 pr=5 m=2 a=2 r=5 op1=0 op2=0
[ 5.644155] 2: w=4 pa=0 pr=5 m=2 a=2 r=5 op1=0 op2=0
[ 5.649844] 0: w=5 pa=0 pr=5 m=2 a=2 r=5 op1=0 op2=0
[ 5.655566] raid5: raid level 6 set md6 active with 5 out of 5 devices, algorithm 2
[ 5.667653] RAID5 conf printout:
[ 5.673791] --- rd:5 wd:5
[ 5.679837] disk 0, o:1, dev:sdb5
[ 5.685721] disk 1, o:1, dev:sdf5
[ 5.691570] disk 2, o:1, dev:sdc5
[ 5.697348] disk 3, o:1, dev:sde5
[ 5.703122] disk 4, o:1, dev:sdd5
[ 5.710762] md6: bitmap initialized from disk: read 1/1 pages, set 0 bits
[ 5.716915] created bitmap (15 pages) for device md6|
--
Adam Ryczkowski
Skype:sisteczko
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