Peter Ludikovsky <pe...@ludikovsky.name> writes:
> Ad 1: Yes, the SATA controller has to support Hot-Swap. You _can_ remove
> the device nodes by running
> # echo 1 > /sys/block/<device>/device/delete
Thanks, I have now my RAID array fully working again. This is what I
have done:
1. Like you suggested above I deleted the drive (/dev/sda* and entries
in /proc/partitions)
echo 1 > /sys/block/sda/device/delete
2. Hotplug-added the new drive. Obviously, my controller doesn't
support or isn't configured to notify the kernel. Using Google I
found the command the have the kernel rescan for drives:
echo "- - -" > /sys/class/scsi_host/host0/scan
3. The rest is straight-forward:
fdisk /dev/sda [Add partition /dev/sda1 with type 0xfd]
mdadm /dev/md0 --add /dev/sda1
update-grub
Now, everything is up again and both drives synced, without reboot:
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[2] sdb1[1]
1953381376 blocks super 1.2 [2/2] [UU]
bitmap: 1/15 pages [4KB], 65536KB chunk
unused devices: <none>
# uptime
11:49:01 up 106 days, 22:44, 23 users, load average: 0.13, 0.19, 0.15
I only wonder if it's normal that the drives are numbered 2 and 1
instead of 0 and 1.
> Ad 2: Depends on the controller, see 1. It might recognize the new
> drive, or not. It might see the correct device, or not.
Next time I reboot the machine I will check whether there are any BIOS
settings to make the controller support hot-plugging.
urs
