[ILUG] SCSI

[Paul Jakma]

On 23 Jul 2001, Mark Kilmartin wrote:

> Does anybody have any experience of adding/removing a SCSI drive to a
> system without rebooting.

yep.

echo "scsi add-single-device a b c d" > /proc/scsi/scsi

where

a = host
b = bus
c = target
d = lun

eg, if you have only 1 scsi card, and say a scanner on ID 3, the
numbers'd be:

0 0 3 0

similarly replace the "add-" with "remove-" to remove.

> This is a system with a RAID controller in it.

ah...

> So it does support adding drives.

the RAID controller does. however purpose of a raid controller is to
make drives 'invisible'. ie the drives are not seen as scsi devices.

> But how do I get Linux to see the drive.

how do you get the /raid controller/ to see the drive.

> Please note I'm not trying to add a drive to an existing RAID setup.
> But an extra drive under Linux.

you'll need to use the RAID controllers setup software.

> A second related question can anybody tell me if it is possible to get
> Linux to reconise that a Drive has grown in size so there is now space
> at the end of a drive.(i.e. if I add an extra drive to a RAID array)

reboot.

if linux sees the extra space - great. if it doesn't - tough.

also note:

some controllers present the extra space as, yep, extra space on the
existing RAID drive.

other controllers present the extra space as a seperate new RAID
drive.

examine the output from your RAID driver very carefully.

> Thanks in Advance for any help.
>
> MArk

--paulj