[ILUG] SCSI

[Mark Kilmartin]

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

Well they are accessed as sd?

The ID which the RAID card sees the induvidual disks as has no
connection to the Way Linux sees them.(I think)

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

The one which doesn't match to the two I know are already there is the
one I want.

I currently have two RAID controllers each which has one Array on each.

I can get info about these two using scsi_info

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.

MArk

On 23 Jul 2001 16:27:01 +0100, Paul Jakma wrote:
> On 23 Jul 2001, Mark Kilmartin wrote:
> 
> > I should elorbrate a bit.
> >
> > I am able to add the drive using the RAID cards config tools.
> >
> > I guess what I'm really asking is there any utility I can use to help me
> > get the bus target and lun number??
> 
> Most (all???) RAID controller drivers under linux are implemented as
> generic block devices - ie not as part of the SCSI system.
> 
> ie it might be a SCSI disk - but under linux it will not in anyway be
> seen as a SCSI disk. it'll probably be seen as being a disk of the
> RAID controller.
> 
> I don't know about MegaRAID, the driver is under drivers/scsi so maybe
> it does go via the SCSI layer, however that still doesn't mean the
> drive is directly accessible.
> 
> so:
> 
> When you reboot:
> 
> - what does the megaraid driver print out
> - how does that fit in with what the MegaRAID config utilities say the
>   new disk is configured?
> 
> > With adding the Disk to the Array.
> 
> > I have it working in that I add a drive and tell the card to grow the
> > array and reboot when it is finished.
> > And the drive now has spare space at the end.
> 
> ah.. ok...
> 
> > What I would like to do is have some way of getting linux to see the new
> > space without rebooting.
> 
> afaik, not possible.
> 
> > I know this is probably impossible.
> 
> yep.
> 
> > MArk