[ILUG] SCSI

[Mark Kilmartin]

Sorry I think I sent my first reply only to Paul.

Thanks for all the help in getting the first part of the problem sorted.

As fare as I know the second part is currently unsolvable but just in
case here are the output of the following.

scsi_info /dev/sda
SCSI_ID="0,0,0"
MODEL="DELL PERCRAID RAID5"
FW_REV="0001"

scsi_info /dev/sdb
SCSI_ID="4,0,0"
MODEL="MegaRAID LD0 RAID5 79512R"
FW_REV="1.57"

scsi_info /dev/sdc
SCSI_ID="4,0,1"
MODEL="MegaRAID LD1 RAID0 34678R"
FW_REV="1.57"

sda is on one RAID controller.

sdb and sdc are one the same channel on the same RAID controller.

sdc is the one I am now able to add and remove without the reboot.


cat /proc/scsi/scsi
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: DELL     Model: PERCRAID RAID5   Rev: 0001
  Type:   Direct-Access                    ANSI SCSI revision: 02
Host: scsi2 Channel: 00 Id: 15 Lun: 00
  Vendor: Dell     Model: 8 BAY U2W CU     Rev: 0209
  Type:   Processor                        ANSI SCSI revision: 03
Host: scsi2 Channel: 04 Id: 00 Lun: 00
  Vendor: MegaRAID Model: LD0 RAID5 79512R Rev: 1.57
  Type:   Direct-Access                    ANSI SCSI revision: 02
Host: scsi2 Channel: 04 Id: 00 Lun: 01
  Vendor: MegaRAID Model: LD1 RAID0 34678R Rev: 1.57
  Type:   Direct-Access                    ANSI SCSI revision: 02



ls /proc/scsi
aac  aic7xxx  megaraid  scsi

ls /proc/scsi/aac
0

ls /proc/scsi/megaraid
2

cat /proc/scsi/aac/0
Raid Controller, scsi hba number  0

cat /proc/scsi/megaraid/2


This last command returns nothing
ie the file /proc/scsi/megaraid/2 is a zero lenght file.

Sorry for forgetting to post these commands but I was just glad to get
the first thing working.

I hope some of these help.

MArk

P.S. In case you haven't guessed up until recently I hadn't had much
experience with SCSI.




On 24 Jul 2001 12:50:45 +0100, Paul Jakma wrote:
> firstly... it is really hard to help you, because you don't post the
> actual output of the tools/commands that you've used, or of things
> like cat /proc/scsi/scsi.
> 
> eg, it's still not clear whether linux sees megaraid devices as SCSI
> disks or not. whether the extra space was added to an existing disk or
> whether it has appeared as a new disk.
> 
> On 24 Jul 2001, Mark Kilmartin wrote:
> 
> > As for being able to add a drive to an existing array. I can add
> > the drive and use the Cards config util to grow the array
> > nondestructively. But to get Linux to see there is more space on
> > the drive requires a reboot.
> 
> yep.
> 
> (unless you can unmount everything and the megaraid driver is a
> module. what does lsmod say?)
> 
> > I then simply make a new partition in this now free space and add
> > that partition to a LVM Volume Group. (GNUparted doesn't support
> > growing LVM partitions yet. This method works fine but I would
> > love to avoid the reboot.
> 
> you probably need the reboot to see the extra space.
> 
> however, why do you want to grow an LVM partition???? even if you
> could, there is no way to tell LVM that PV has increased in size.
> 
> Instead... make a new LVM PV partition out of the extra space. (ie do
> not repartition - just add a new one on the extra space). Then
> pvcreate and vgextend to add this new PV to your VG.
> 
> > This would remove another reason for having to reboot this particular
> > server.
> 
> 
> >
> > MArk
> 
> 
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