LinuxQuestions.org
Visit Jeremy's Blog.
Go Back   LinuxQuestions.org > Forums > Enterprise Linux Forums > Linux - Enterprise
User Name
Password
Linux - Enterprise This forum is for all items relating to using Linux in the Enterprise.

Notices

Reply
 
Search this Thread
Old 10-22-2009, 07:38 AM   #1
SteveInTallyFL
Member
 
Registered: May 2008
Location: Tallahassee, FL
Distribution: RHEL4, RHEL 5, OEL4, OEL5
Posts: 58

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.
Quote:
(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.
I have a 'gut feeling' that I must have missed something. Is there a better way?
 
Old 10-22-2009, 09:16 AM   #2
ilikejam
Senior Member
 
Registered: Aug 2003
Location: Glasgow
Distribution: Fedora / Solaris
Posts: 3,109

Rep: Reputation: 96
Hi.

Had you formatted the LUNs before you looked for their UUIDs?

Dave
 
Old 10-23-2009, 07:14 AM   #3
SteveInTallyFL
Member
 
Registered: May 2008
Location: Tallahassee, FL
Distribution: RHEL4, RHEL 5, OEL4, OEL5
Posts: 58

Original Poster
Rep: Reputation: 17
No, I had not. I looked for them before I went with the LVM approach to partitioning and formatting.
 
Old 10-23-2009, 10:38 AM   #4
ilikejam
Senior Member
 
Registered: Aug 2003
Location: Glasgow
Distribution: Fedora / Solaris
Posts: 3,109

Rep: Reputation: 96
The UUIDs are a property of the filesystem, so the LUNs would have to be formatted before you'd see them.

Dave
 
  


Reply

Tags
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
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
Firewall, advice sought. PBH Grafpup 4 08-10-2007 06:18 AM
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


All times are GMT -5. The time now is 05:15 AM.

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