Mogens Kjaer writes:
2. Remove the drive from the kernel: echo "scsi remove-single-device 0 0 0 0" >/proc/scsi/scsi
Thanks for that tip. I note that the proc man page does not document this command, only add-single-device is documented. I was wondering about how the kernel need to be notified about a removed device.
Now that I know the required voodoo on the Linux side of things, the actual procedure turned out to be surprisingly painless. Fail, then remove all partitions, remove the device, cut the power to the hot-swap bay, pull the case out, unscrew it, remove the drive, insert the new drive, cover it back up, put the case back into the hotswap bay, turn the power on, wait for the disk to spin up, go back to the console, add the device, set up a new partition table, and add all partitions back to the RAID volumes. Took me less than 10 minutes. End result: replaced a failing drive, no loss of uptime. I'll still need to verify that "/sbin/grub-install /dev/sda" makes the new disk bootable.
echo "scsi add-single-device 0 0 0 0" >/proc/scsi/scsi This can take awhile, the drive has to spin up.
Actually, at least my new Seagate Cheetah spun up as soon as it received power from the hotswap bay. It was ready in about 7 seconds, and there was no subsequent delay doing add-single-device.
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