On Mon, 13 Sep 1999, Lawrence Dickson wrote:
>1. unmount everything that's directly on the disk that isn't raid.
>2. swapoff if you have swap on that disk
Didn't understand this. Our system is on hda and we can't
unmount it.
indeed. you can't do it on the disk with the root-device on it.
However you should be able to do it if you have root-raid setup. Ie
root on a RAID-1 device and boot the kernel from a non-significant
device like a floppy or an old spare ide disk.
>3:
>
>echo "scsi remove-single-device c b t l" > /proc/scsi/scsi
Tried it and it didn't work. But I noticed /proc/mdstat had
an (F) after sdo1. So I tried from another terminal
raidhotremove /dev/md0 /dev/sdo1
forgot to mention this above.. absolutely nothing must be using the
disk, no mounted partitions, no swap active, not being used by
md/lvm.. etc.
which hung THAT terminal and gave me a D in ps ax.
THEN I tried
echo "scsi remove-single-device 2 0 2 0" >/proc/scsi/scsi
and that worked; it was gone from /proc/scsi/scsi.
[snip]
>
>We never.. never.. never.. ever.. reboot linux!!
a bit tongue in cheek this.. :)
I guess we will have to - which is really a bummer. We were
hoping to make our RAID product more friendly to customers.
The latest raid patches are pretty much configure, take notes and
forget. It'll take care of itself really.
Larry Dickson
PS. We would really appreciate, if possible, some route that
does NOT require massive kernel recompiles and leading-edge
alpha code.
If you're reffering to hot-swapping SCSI disks, then it does work.
I've used the above method quite a few times and it works for me.
Although in every case it was for disks with bad-blocks (ie the
drives interface logic was fine). But if the electronics are gone
funny and the hardware won't co-operate there's no way around a
reboot.
Caveat: I've only tried on servers with hot-swap bays and drive
caddies. Hot-(un)plugging plain SCSI cable connectors probably won't
work, there's even a (smallish) chance of damaging the device being
swapped and other devices on the same bus (including the controller).
As for Alpha code, the latest raid patches are the ones to use for
production machines. I don't understand why they've not been folded
back into the main kernel source. But make sure to use the latest
RAID patches, as they are the ones with the best hot-swap support.
regards,
--
Paul Jakma
[EMAIL PROTECTED] http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
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linux: because a PC is a terrible thing to waste
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