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-   -   Best Prac Advice Sought: UUID-based labeling SAN-presented LUNS to RHEL4 (http://www.linuxquestions.org/questions/linux-enterprise-47/best-prac-advice-sought-uuid-based-labeling-san-presented-luns-to-rhel4-763696/)

SteveInTallyFL 10-22-2009 08:38 AM

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?:scratch:

ilikejam 10-22-2009 10:16 AM

Hi.

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

Dave

SteveInTallyFL 10-23-2009 08:14 AM

No, I had not. I looked for them before I went with the LVM approach to partitioning and formatting.

ilikejam 10-23-2009 11:38 AM

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

Dave


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