[ILUG] SCSI

[Paul Jakma]

On 23 Jul 2001, Mark Kilmartin wrote:

> AFAIK The RAID Card makes any Arrays on it look like SCSI disks.

ok.

> Well they are accessed as sd?

i don't know.. :) i don't know the megaraid card.

> Is there a way to ask Linux to scan the SCSI buses and tell me about
> what ever disks(Not physical disks) it sees.

either a reboot, or a driver specific command to /proc/scsi/<driver>
(if the driver supports it).

> I can get info about these two using scsi_info

so:

what does scsi_info say?
what does cat /proc/scsi/scsi say?
is there an entry in /proc/scsi for your megaraid card?
	if so, what does cat /proc/scsi/<megaraid/... say?

> So if there was any way of getting info on all the available
> drives/arrays I would then know which one wasn't already available and
> the options to use to activate it using the add-single-device command.

however, didn't you say that the new disk has been /added/ to an
existing disk? ie an existing disk has been expanded.

if so you'll need to unmount everything on it, then if the megaraid
disk is listed in /proc/scsi/scsi:

echo "scsi remove-single-device a b c d" > /proc/scsi/scsi
cat /proc/scsi/scsi (make sure it is gone)
echo "scsi add-single-device a b c d" > /proc/scsi/scsi
cat /proc/scsi/scsi (make sure it is back)

fdisk /dev/sd? (see if linux sees the extra space)

if that doesn't work, or the disk isn't listed in /proc/scsi/scsi,
then there's still one option: if megaraid is a module and you are
able to umount all the disks on it: unload and reload the module.

if none of those work... sorry you have to reboot.

> MArk

--paulj