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Home > Archive > Unix administration > July 2006 > iSCSI lun sharing?
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iSCSI lun sharing?
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| Jeremiah DeWitt Weiner 2006-07-13, 7:22 pm |
| A very simple question: if you have one LUN on an iSCSI storage
device, can you have multiple hosts access that LUN at once? Or is it
the same as DAS or SAN in that each host assumes exclusive access to the
storage, and multiple hosts accessing the same storage at once will step
on each others' toes? I strongly suspect it's the second, but I just
wanted to confirm.
--
Oh to have a lodge in some vast wilderness. Where rumors of oppression
and deceit, of unsuccessful and successful wars may never reach me
anymore.
-- William Cowper
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| Michael Vilain 2006-07-14, 7:25 am |
| In article <e96dop$2mc$1@reader2.panix.com>,
Jeremiah DeWitt Weiner <jdw@panix.com> wrote:
> A very simple question: if you have one LUN on an iSCSI storage
> device, can you have multiple hosts access that LUN at once? Or is it
> the same as DAS or SAN in that each host assumes exclusive access to the
> storage, and multiple hosts accessing the same storage at once will step
> on each others' toes? I strongly suspect it's the second, but I just
> wanted to confirm.
In general, no. That requires a Cluster-aware filesystem. Some SCSI
devices are uniquely aquired by the SCSI master, so cannot be release or
access while being "owned" by the master. If you have UFS on those
disks, forgetaboutit. QFS and other filesystems, it depends.
--
DeeDee, don't press that button! DeeDee! NO! Dee...
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