* Hi,
*
* While playing around with multipath configuration,
* I found a bug, maybe. Kernel is 2.4.18-rc2.
*
* My /etc/raidtab looks like this:
raiddev /dev/md0
raid-level multipath
nr-raid-disks 2
chunk-size 32
persistent-superblock 1
device /dev/cciss/c0d2
raid-disk 0
device /dev/cciss/c1d0
raid-disk 1
* /dev/cciss/c0d2 and /dev/cciss/c1d0
* are the same physical disks.
*
* First, I got this:
cciss: cmd cff20000 is reported invalid
* This was because I deliberately disconnected a scsi
* cable to make the active path fail while i/o was occurring.
*
* Then, I got this:
multipath: IO failure on cciss/c1d0, disabling IO path.
Operation continuing on 0 IO paths.
md: bug in file md.c, line 3277
md: **********************************
md: * <COMPLETE RAID STATE PRINTOUT> *
md: **********************************
md0: <cciss/c1d0><cciss/c0d2> array superblock:
md: SB: (V:0.90.0) ID:<ab96c56e.9252f7d4.97a9920a.8c37a4b2> CT:3c751d99
md: L-4 S05116224 ND:2 RD:1 md0 LO:0 CS:32768
md: UT:3c751d99 ST:0 AD:0 WD:1 FD:1 SD:1 CSUM:47b9f3a5 E:00000001
D 0: DISK<N:0,cciss/c1d0(105,0),R:0,S:1>
D 1: DISK<N:1,cciss/c0d2(104,32),R:1,S:0>
md: THIS: DISK<N:1,cciss/c1d0(105,0),R:1,S:6>
md: rdev cciss/c1d0: O:cciss/c1d0, SZ:05116224 F:0 DN:0 <6>md: rdev superblock:
md: SB: (V:0.90.0) ID:<ab96c56e.9252f7d4.97a9920a.8c37a4b2> CT:3c751d99
md: L-4 S05116224 ND:2 RD:2 md0 LO:0 CS:32768
md: UT:00000000 ST:0 AD:2 WD:2 FD:0 SD:0 CSUM:47b9f3a5 E:00000000
D 0: DISK<N:0,cciss/c0d2(104,32),R:0,S:6>
D 1: DISK<N:1,cciss/c1d0(105,0),R:1,S:6>
md: THIS: DISK<N:1,cciss/c1d0(105,0),R:1,S:6>
md: rdev cciss/c0d2: O:cciss/c0d2, SZ:05116224 F:0 DN:1 <6>md: rdev superblock:
md: SB: (V:0.90.0) ID:<ab96c56e.9252f7d4.97a9920a.8c37a4b2> CT:3c751d99
md: L-4 S05116224 ND:2 RD:1 md0 LO:0 CS:32768
md: UT:3c751d99 ST:0 AD:1 WD:2 FD:0 SD:1 CSUM:842f11b5 E:00000001
D 0: DISK<N:0,cciss/c1d0(105,0),R:0,S:6>
D 1: DISK<N:1,cciss/c0d2(104,32),R:1,S:0>
md: THIS: DISK<N:1,cciss/c0d2(104,32),R:1,S:0>
md: **********************************
MULTIPATH conf printout:
--- wd:0 rd:1 nd:2
disk0, s:0, o:0, n:0 rd:0 us:1 dev:cciss/c1d0
disk1, s:1, o:0, n:1 rd:1 us:1 dev:cciss/c0d2
MULTIPATH conf printout:
--- wd:0 rd:1 nd:2
disk0, s:0, o:0, n:0 rd:0 us:1 dev:cciss/c1d0
disk1, s:1, o:1, n:1 rd:1 us:1 dev:cciss/c0d2
got DISKOP_SPARE_WRITE err: 0. (spare_faulty(): 0)
MULTIPATH conf printout:
--- wd:0 rd:1 nd:2
disk0, s:0, o:0, n:0 rd:0 us:1 dev:cciss/c1d0
disk1, s:1, o:1, n:1 rd:1 us:1 dev:cciss/c0d2
MULTIPATH conf printout:
--- wd:1 rd:1 nd:2
disk0, s:0, o:1, n:0 rd:0 us:1 dev:cciss/c0d2
disk1, s:0, o:0, n:1 rd:1 us:1 dev:cciss/c1d0
multipath: cciss/c1d0: rescheduling block 1572952
md: recovery thread got woken up ...
md: recovery thread finished ...
md: updating md0 RAID superblock on device
md: (skipping faulty (skipping alias cciss/c1d0 )
md: cciss/c0d2 [events: 00000002]<6>(write) cciss/c0d2's sb offset: 5116224
multipath: cciss/c0d2: redirecting sector 1572952 to another IO path
*
* i/o seemed to continue just fine though.
*
* Any ideas?
*
* -- steve
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