topic Re: How to know which disk drive was added? in Operating System - Linux

How to know which disk drive was added?

ben10_1 — Thu, 11 Feb 2010 21:06:32 GMT

Hi Forum,

I am adding SCSI hard disk to a linux server.
How can I know and be sure which disk is added before I run the fdisk and Mkfs?

Re: How to know which disk drive was added?

Steven E. Protter — Thu, 11 Feb 2010 21:09:10 GMT

Shalom,

fdisk -l

You might want to try providing your distribution of Linux and situation details to get more help.

SEP

Re: How to know which disk drive was added?

Ivan Ferreira — Thu, 11 Feb 2010 22:03:21 GMT

You can use:

dumpe2fs -h /dev/sdX

To identify if the disk already has a File System.

cat /etc/fstab

To identify the disks and their mount points

mount

To identify the disks and their mount point

swap -s

To identify disks used as swap

pvs/pvdisplay

To identify disks used by LVM

The only missing part here is to identify disks used without filesystem for example by Oracle. You must consult your DBA.

Normally from the output of:

fdisk -l

You would recognize your new disk as it would not have partition table, and the matching size.

Re: How to know which disk drive was added?

ben09 — Fri, 12 Feb 2010 06:47:52 GMT

So the best way is to do:

-fdisk -f before adding the scsi disk
-Note down the disk drive that exist
-Connect the disk
-fdisk -l to see what was added.

I am right? I guess this is the best way to go.

Re: How to know which disk drive was added?

Matti_Kurkela — Fri, 12 Feb 2010 13:26:33 GMT

When a new disk is detected, messages identifying the disk device are output to the kernel message buffer. You can use the "dmesg" command to view it.

If you have the "lsscsi" utility (available as an optional package in RHEL 5, probably other newer distributions too) and you know the SCSI device number of your new disk, you can find the device name easily in the lsscsi output.

http://sg.danny.cz/scsi/lsscsi.html

MK

Re: How to know which disk drive was added?

Steven Schweda — Fri, 12 Feb 2010 15:18:46 GMT

> -fdisk -f before adding the scsi disk
> [...]

Or, if it's too late, then remove the actual
disk, and look for the apparent disk (device
special file) which you appear to have, but
which no program can talk to.