Hello
I’m stuck trying to add a 4th disc to an IMSM RAID5 container:
# mdadm -a /dev/md127 /dev/sdb
mdadm: added /dev/sdb
# mdadm --grow --raid-devices=4
/dev/md127 --backup-file=/mnt/spare/raid-backup-file
mdadm: Cannot read superblock for /dev/md127
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdd[2] sda[1] sdc[0]
1887436800 blocks super external:/md127/0 level 5, 128k chunk,
algorithm 0 [3/3] [UUU]
md1 : active (auto-read-only) raid5 sdc[2] sdd[1] sda[0]
66077696 blocks super external:/md127/1 level 5, 128k chunk, algorithm
0 [3/3] [UUU]
md127 : inactive sdb[3](S) sda[2](S) sdc[1](S) sdd[0](S)
12612 blocks super external:imsm
unused devices: <none>
# mdadm –V
mdadm - v3.3 - 3rd September 2013
I don’t know if this is related but mdmon has trouble finding the ports:
# mdadm --detail-platform -v
mdadm: checking metadata 0.90
mdadm: 0.90 metadata is platform independent
mdadm: checking metadata 1.x
mdadm: 1.x metadata is platform independent
mdadm: checking metadata ddf
mdadm: ddf metadata is platform independent
mdadm: checking metadata imsm
mdmon: found Intel(R) SATA RAID controller at 0000:00:1f.2.
Platform : Intel(R) Matrix Storage Manager
Version : 11.6.0.1702
RAID Levels : raid0 raid1 raid10 raid5
Chunk Sizes : 4k 8k 16k 32k 64k 128k
2TB volumes : supported
2TB disks : supported
Max Disks : 6
Max Volumes : 2 per array, 4 per controller
I/O Controller : /sys/devices/pci0000:00/0000:00:1f.2 (SATA)
mdmon: failed to determine port number for
/sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0
mdmon: failed to enumerate ports on SATA controller at 0000:00:1f.2.
mdadm: checking metadata mbr
mdadm: mbr metadata is platform independent
mdadm: checking metadata gpt
mdadm: gpt metadata is platform independent
#
Thanks
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