On Tue, 2014-04-01 at 16:42 +0100, nixbugz wrote: > 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 I think you need to grow the RAID volume and not the container? So it would be /dev/md0 or /dev/md1 instead of /dev/md127? Here's URL to the Linux IMSM user's manual that hopefully may be of use: http://www.intel.com/support/chipsets/rste/sb/CS-033622.htm > > # 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 > # Artur, any ideas why mdmon isn't happy in this instance? > Thanks > > -- > 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 ��.n��������+%������w��{.n�����{����w��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
