Hi everybody,
I've been struggling with a software RAID issue for several days now. Before
sending the computer back to the vendor and asking for real RAID support, I'd
like to try my luck here.
The system as an Intel Matrix Storage SATA controller and two 250GB disks on
which I want to use a RAID1.
I've been able to create the array properly from a Gentoo installation CD
(this might be a detail, but it might also influence homehost values, so I
thought I'd mention it) with the metadata stored in IMSM format.
Assembling the array automatically from the installation CD works.
livecd ~ # mdadm --assemble --scan
mdadm: Container /dev/md/imsm0 has been assembled with 2 drives
mdadm: Started /dev/md/vol0_0 with 2 devices
livecd ~ # cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md126 : active (auto-read-only) raid1 sda[1] sdb[0]
244195328 blocks super external:/md127/0 [2/2] [UU]
md127 : inactive sdb[1](S) sda[0](S)
4514 blocks super external:imsm
unused devices: <none>
livecd ~ # cat /proc/partitions
major minor #blocks name
7 0 94664 loop0
8 0 244198584 sda
8 16 244198584 sdb
8 32 998400 sdc
8 33 998368 sdc1
9 126 244195328 md126
259 0 5242882 md126p1
259 1 5242884 md126p2
259 2 233709560 md126p3
So far, so good.
I've then created an mdadm.conf file with mdadm -E --scan
livecd ~ # mdadm -E --scan
ARRAY metadata=imsm UUID=480da1d0:8150f280:7dd8425d:bec99c46
ARRAY /dev/md/vol0 container=480da1d0:8150f280:7dd8425d:bec99c46 member=0
UUID=17e28225:34f7c425:eb78aece:05c29a40
livecd ~ # mdadm --assemble --scan
mdadm: Container /dev/md/imsm0 has been assembled with 2 drives
mdadm: Started /dev/md/vol0 with 2 devices
livecd ~ # cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md126 : active (auto-read-only) raid1 sda[1] sdb[0]
244195328 blocks super external:/md127/0 [2/2] [UU]
md127 : inactive sdb[1](S) sda[0](S)
4514 blocks super external:imsm
unused devices: <none>
livecd ~ # cat /proc/partitions
major minor #blocks name
7 0 94664 loop0
8 0 244198584 sda
8 16 244198584 sdb
8 32 998400 sdc
8 33 998368 sdc1
9 126 244195328 md126
259 0 5242882 md126p1
259 1 5242884 md126p2
259 2 233709560 md126p3
Still good so far. The /dev/md/vol0_0 device is now called /dev/md/vol0.
Copying the mdadm.conf file to initramfs and rebooting, the array is correctly
assemble with mdadm --assemble --scan
livecd ~ # mdadm --assemble --scan
mdadm: Container /dev/md/imsm0 has been assembled with 2 drives
mdadm: Started /dev/md/vol0 with 2 devices
livecd ~ # cat /proc/mdstat
Personalities : [raid1]
md126 : active (read-only) raid1 sda[1] sdb[0]
244195328 blocks super external:/md127/0 [2/2] [UU]
md127 : inactive sdb[1](S) sda[0](S)
4514 blocks super external:imsm
unused devices: <none>
However, no partitions are detected.
livecd ~ # cat /proc/partitions
major minor #blocks name
8 0 244198584 sda
8 16 244198584 sdb
8 32 998400 sdc
8 33 998368 sdc1
9 126 244195328 md126
If I remove the /etc/mdadm.conf file from the initramfs image, the volume is
detected as vol0_0 instead of vol0 and the partitions are correctly detected.
I don't understand what's going on there, and how I could fix it. Help would
be greatly appreciated.
--
Regards,
Laurent Pinchart
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