topic Re: Identify SAN Disks in Operating System - Linux

Identify SAN Disks

M.Thomas — Mon, 08 Jan 2007 17:58:51 GMT

Please let me what command would tell me the difference between local and the SAN disks. linux redhat AS 3.

Thanks

THOMAS

Re: Identify SAN Disks

Steven E. Protter — Tue, 09 Jan 2007 03:58:30 GMT

fdisk -l

The hardware path for local disks are almost always displayed before SAN.

SEP

Re: Identify SAN Disks

Andrew Cowan — Wed, 10 Jan 2007 04:33:18 GMT

The path names will tell you if the local disks are "IDE", but not if they are SCSI since SAN's use sudo-SCSI drivers.

Take a look at your dmesg output and identifiy the name of your SAN adapter. lspci may also show the name of the card. Next look at "/proc/scsi/adapter-name" and "/proc/scsi/scsi" and this should give further clues.

Some adapter code also adds utilities such as: probe-luns so it's worth looking for any extra RPM's that were loaded.

Re: Identify SAN Disks

Patrick Terlisten — Wed, 10 Jan 2007 05:45:39 GMT

Hello,

if you are using a ProLiant with a Smart Array controller, the disks attatched to the Smart Array will use /dev/cciss/c0d0, /dev/cciss/c0d1 ... as device name. Logical drives from a storage in you SAN will use the traditional device names like /dev/sda, /dev/sdb... Take a look at /proc/scsi/scsi or the output of dmesg.

Regards,
Patrick

Re: Identify SAN Disks

Ganesh Balraman — Wed, 10 Jan 2007 06:00:31 GMT

Dear Sir,

By default scsi internal disk will be /dev/sdb.

And for next available device either san or another scsi channel it will be sdb.

Use fdisk -l will list the availbale disk seen.This coammnd will not do any modification in ur disk , Need not tor worry.
Regds
B.Ganesh

Re: Identify SAN Disks

Siert Zijl — Wed, 10 Jan 2007 18:51:10 GMT

If you have a ProLiant server connected to a SAN the '/dev/cciss/*' devices are local storage and /dev/sd* devices are probably SAN disks.

Make sure you install the fibreutils RPM from the HP ProLiant Support Pack. They include a couple of useful utilities to identify SAN disks & devices:

- lssg (display generic san devices)
- lssd (display san disk devices)
- adapter_info (display hba information)

You can also take a look inside the /proc filesystem to get useful information:

Smart Array Controller: /proc/driver/cciss/
SCSI devices: /proc/scsi/scsi
QLA Host Bus Adapter: /proc/scsi/qla2300

Re: Identify SAN Disks

SJO EGGER — Thu, 18 Jan 2007 02:40:31 GMT

morning

use "lsscsi" to list all SCSI devices or "scsi_info /dev/" to see more info like WWN and LUN WWID.

regards