Aha! Found it!
Before I tried IMSM support on real hardware, I ran some tests in
VirtualBox. Because VirtualBox has no Intel Matrix option rom, I set
IMSM_NO_PLATFORM=1 everywhere.
That was stil the case in my initramfs, so mdmon was started with
IMSM_NO_PLATFORM=1 in the environment. And apparently everything just
works, except for adding a fresh disk as a spare ..
I restarted (-t --all) mdmon without IMSM_NO_PLATFORM in the
environment, did mdmon /dev/md127 --add /dev/sda, and the rebuild
started right away.
Thanks,
Mike.
On 9-08-12 4:17 PM, Miquel van Smoorenburg wrote:
(oh apologies- I misspelt imsm as imsi in the subject - really mean
imsm, the Intel Matrix BIOS fakeraid).
This server has two disks, /dev/sda and /dev/sdb. I created a RAID1 IMSM
array in the BIOS, then booted linux and detected the array with
mdadm --examine --scan > /etc/mdadm/mdadm.conf
mdadm --assemble --scan --run --auto=yes
Then /dev/md127 shows up as imsm container, /dev/md126 is the array
itself, and (after partitioning) /dev/md looks like this:
root@server3-b05-tpb:~# ls -l /dev/md
total 0
lrwxrwxrwx 1 root root 8 Aug 9 14:15 Volume0 -> ../md126
lrwxrwxrwx 1 root root 10 Aug 9 13:34 Volume0p1 -> ../md126p1
lrwxrwxrwx 1 root root 10 Aug 9 13:34 Volume0p2 -> ../md126p2
lrwxrwxrwx 1 root root 10 Aug 9 13:34 Volume0p5 -> ../md126p5
lrwxrwxrwx 1 root root 8 Aug 9 13:55 imsm0 -> ../md127
Then I removed /dev/sda (by pulling it out), put it back in, zero'd the
superblock, added it back with mdadm --add /dev/md127 /dev/sda, and now
it just sits there as member of the container, but the array in md126
doesn't start to rebuild.
[ actually, it's a bit more complicated than this, since I am fixing up
the debian wheezy installer to support imsm arrays, with quite a bit of
success, so I installed debian with this array as the root filesystem ]
Yes, mdmon is running.
dmesg when I pulled out /dev/sda:
ata1: exception Emask 0x50 SAct 0x0 SErr 0x4090800 action 0xe frozen
ata1: irq_stat 0x00400040, connection status changed
ata1: SError: { HostInt PHYRdyChg 10B8B DevExch }
ata1: hard resetting link
ata1: SATA link down (SStatus 0 SControl 300)
ata1: hard resetting link
ata1: SATA link down (SStatus 0 SControl 300)
ata1: limiting SATA link speed to 1.5 Gbps
ata1: hard resetting link
ata1: SATA link down (SStatus 0 SControl 310)
ata1.00: disabled
ata1: EH complete
sd 1:0:0:0: rejecting I/O to offline device
killing request
Unhandled error code
Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
CDB: Write(10): 2a 00 57 54 66 ef 00 00 01 00
end_request: I/O error, dev sda, sector 1465149167
ata1.00: detaching (SCSI 1:0:0:0)
Synchronizing SCSI cache
Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
Stopping disk
START_STOP FAILED
Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
md/raid1:md126: Disk failure on sda, disabling device.
md/raid1:md126: Operation continuing on 1 devices.
RAID1 conf printout:
--- wd:1 rd:2
disk 0, wo:1, o:0, dev:sda
disk 1, wo:0, o:1, dev:sdb
RAID1 conf printout:
--- wd:1 rd:2
disk 1, wo:0, o:1, dev:sdb
md: unbind<sda>
md: export_rdev(sda)
On 08/09/2012 03:47 PM, Roberto Spadim wrote:
explain better..
do you have 2 disks in raid1, and removed one disk, or removed two disks?
could you send dmesg messages?
2012/8/9 Miquel van Smoorenburg <mikevs@xxxxxxxxxx>:
Setup: kernel 3.2.21 (debian testing), mdadm 3.2.5.
I created a RAID1 imsi array on a supermicro server for testing
purposes. I'm trying to see what happens if I hot-remove disks,
hot-add them, reboot, etc to test the resiliency of this setup.
So I removed (by pulling it out) one disk, then simulated adding
a blank replacement disk by putting it back in and running
mdadm --zero-superblock on it.
I re-added it to the container with mdadm /dev/md127 --add /dev/sda..
and now it just sits there. How do I get the RAID1 array (dev/md126)
to start using this disk? The manpage says:
-a, --add
hot-add listed devices. If a device appears to have
recently
been part of the array (possibly it failed or was
removed) the
device is re-added as described in the next
point. If that
fails or the device was never part of the array, the
device is
added as a hot-spare. If the array is degraded, it
will imme‐
diately start to rebuild data onto that spare.
However, nothing is happening:
root@server3-b05-tpb:~/tmp# cat /proc/mdstat
Personalities : [raid1]
md126 : active raid1 sdb[0]
31457280 blocks super external:/md127/0 [2/1] [_U]
md127 : inactive sda[1](S) sdb[0](S)
6306 blocks super external:imsm
Thanks,
Mike.
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