I am facing a problem which I believe is new (I distinctly remember doing the same on 2.6.somethingold couple years ago). When I try to grow an array where all memembers have been replaced with large ones I get an inexplicable. kernel: md: couldn't update array info. -22 Nothing else. I am using kernel 3.2.0 and mdadm 3.2.3, both from debian: http://packages.debian.org/sid/linux-image-3.2.0-2-amd64 (3.2.15-1) http://packages.debian.org/sid/mdadm (3.2.3-2) Here is my full test setup replicating the problem (was replicated on a different machine). Let me know if I can assist further in figuring this out: root@Thesaurus:~/raidfail# for n in $(seq 4) ; do dd if=/dev/zero of=member_$n.img bs=1M count=256 ; done root@Thesaurus:~/raidfail# for n in $(seq 4) ; do losetup /dev/loop$n member_$n.img ; done root@Thesaurus:~/raidfail# losetup -a /dev/loop1: [fd01]:1081442 (/root/raidfail/member_1.img) /dev/loop2: [fd01]:1081481 (/root/raidfail/member_2.img) /dev/loop3: [fd01]:1081483 (/root/raidfail/member_3.img) /dev/loop4: [fd01]:1081515 (/root/raidfail/member_4.img) root@Thesaurus:~/raidfail# mdadm -C /dev/md1010 -l 10 -p f3 -n 4 -c 256 -e 1.2 -z 128M /dev/loop[1234] mdadm: largest drive (/dev/loop1) exceeds size (131072K) by more than 1% Continue creating array? y mdadm: array /dev/md1010 started. root@Thesaurus:~/raidfail# mdadm -w /dev/md1010 root@Thesaurus:~/raidfail# cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] [raid10] md1010 : active raid10 loop4[3] loop3[2] loop2[1] loop1[0] 174080 blocks super 1.2 256K chunks 3 far-copies [4/4] [UUUU] (Note - no bitmaps, no anything) root@Thesaurus:~/raidfail# mdadm --grow --size=max /dev/md1010 mdadm: Cannot set device size for /dev/md1010: Invalid argument root@Thesaurus:~/raidfail# tail /var/log/kern.log Apr 25 09:52:36 localhost kernel: md: using maximum available idle IO bandwidth (but not more than 30000 KB/sec) for resync. Apr 25 09:52:36 localhost kernel: md: using 128k window, over a total of 174080k. Apr 25 09:52:42 localhost kernel: md: md1010: resync done. Apr 25 09:52:43 localhost kernel: RAID10 conf printout: Apr 25 09:52:43 localhost kernel: --- wd:4 rd:4 Apr 25 09:52:43 localhost kernel: disk 0, wo:0, o:1, dev:loop1 Apr 25 09:52:43 localhost kernel: disk 1, wo:0, o:1, dev:loop2 Apr 25 09:52:43 localhost kernel: disk 2, wo:0, o:1, dev:loop3 Apr 25 09:52:43 localhost kernel: disk 3, wo:0, o:1, dev:loop4 Apr 25 09:53:39 localhost kernel: md: couldn't update array info. -22 root@Thesaurus:~/raidfail# mdadm -D /dev/md1010 /dev/md1010: Version : 1.2 Creation Time : Wed Apr 25 09:52:24 2012 Raid Level : raid10 Array Size : 174080 (170.03 MiB 178.26 MB) Used Dev Size : 130560 (127.52 MiB 133.69 MB) Raid Devices : 4 Total Devices : 4 Persistence : Superblock is persistent Update Time : Wed Apr 25 09:52:43 2012 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Layout : far=3 Chunk Size : 256K Name : Thesaurus:1010 (local to host Thesaurus) UUID : 19aeca84:142ee179:b344a19d:08a730fc Events : 17 Number Major Minor RaidDevice State 0 7 1 0 active sync /dev/loop1 1 7 2 1 active sync /dev/loop2 2 7 3 2 active sync /dev/loop3 3 7 4 3 active sync /dev/loop4 root@Thesaurus:~/raidfail# mdadm -E /dev/loop1 /dev/loop1: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 19aeca84:142ee179:b344a19d:08a730fc Name : Thesaurus:1010 (local to host Thesaurus) Creation Time : Wed Apr 25 09:52:24 2012 Raid Level : raid10 Raid Devices : 4 Avail Dev Size : 522240 (255.04 MiB 267.39 MB) Array Size : 261120 (127.52 MiB 133.69 MB) Used Dev Size : 261120 (127.52 MiB 133.69 MB) Data Offset : 2048 sectors Super Offset : 8 sectors State : clean Device UUID : d7734a6c:5df0c7cc:b5f7dc04:6595a5eb Update Time : Wed Apr 25 09:53:05 2012 Checksum : 22c8ad18 - correct Events : 17 Layout : far=3 Chunk Size : 256K Device Role : Active device 0 Array State : AAAA ('A' == active, '.' == missing) -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
