Help answer threads with 0 replies.
Go Back > Forums > Linux Forums > Linux - Server
User Name
Linux - Server This forum is for the discussion of Linux Software used in a server related context.


  Search this Thread
Old 10-22-2009, 09:07 AM   #1
Registered: May 2008
Location: Tallahassee, FL
Distribution: RHEL4, RHEL 5, OEL4, OEL5
Posts: 65

Rep: Reputation: 17
Best Prac Advice Sought: UUID-based labeling SAN-presented LUNS to RHEL4

I installed and initialized the IBM/LSI RDAC (mpp) drivers and then I had LUNs presented to my server from an IBM DS4300. I wanted to mount them with UUID-based labels. The mppBusRescan returned them as /dev/sd[a-c]. There were no mappings to /dev/disk/by-id even though there was a udev rule in 51-by-id.rules.
(KERNEL="sd*[!0-9]", PROGRAM="/sbin/scsi_id", SYMLINK="disk/by-id/scsi-%c")
So I ended up using LVM to partition, format, and mount them. I have 2 concerns:

* I have a nagging suspicion that LVM on top of SAN is unnecessary overhead to the I/O processing.
* I don't know if LVM will handle a change in sd* assignment should a SAN-presented LUN be removed or sd assignment change at reboot.

I have a 'gut feeling' that I must have missed something. Is there a better way?
Old 10-23-2009, 02:51 AM   #2
Registered: Oct 2009
Location: Amsterdam
Distribution: CentOS,Fedora,Puppy
Posts: 62

Rep: Reputation: 20
I use the same SAN and LVM methods, never caused me a problem.
The disk names do not change if you add / remove other LUN's.

PS, my uuid link / labels are present:

[root@starvinmarvin by-uuid]# ls -l *
lrwxrwxrwx 1 root root 10 Oct 15 16:11 1223d74c-6eb5-46bf-8c58-2da9f4bf56e7 -> ../../sda1


label, lvm2, rdac, rhel4

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
[SOLVED] Best Prac Advice Sought: UUID-based labeling SAN-presented LUNS to RHEL4 SteveInTallyFL Linux - Enterprise 3 10-23-2009 10:38 AM
Multiple Luns on RHEL4 UltraSoul Linux - Hardware 0 05-11-2008 08:02 PM
RHEL4 has problems seeing all the LUNs on a cx3-40 array rtaheri Linux - Enterprise 1 03-17-2008 05:05 PM
autosense SAN LUNS sg001 Linux - Server 1 07-17-2007 10:10 AM
san disk not being presented correctly to ql2340L card ronanio Linux - Hardware 1 01-23-2006 05:40 AM > Forums > Linux Forums > Linux - Server

All times are GMT -5. The time now is 01:00 PM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration