afaik, the node was stored in xlv, which was an extra option in IRIX, (
extra license) but this could later be used in CXFS which allows
multiple machines to mount the same FS read write from a SAN, made for
clusters, HA and HPC...
knowledge of the node "owning" the device was in there for protection.
but can be overridden with an xlv command.
kind regards, Kris
Jan-Frode Myklebust wrote:
On 2006-08-07, Heilige Gheist <hgheist@xxxxxxxxx> wrote:
It's obvious that I can always fall back to the inter-node heart-beat
to ensure that only one node is mounting the filesystem.
I'm just wondering if there's any facility or accepted practice to
enforce it.
STONITH (Shoot The Other Node In The Head) trough smart power switches
or management adapters in the node.
SCSI reserve/release ... No idea how reliable this is on a SAN, but the
ServeRAID-version works great. http://www.linux-ha.org/ServeRAID
Export the volume group, or scsi device on the first node, before
importing/attaching it on the second .. Probably best to use together
with STONITH, in case the first node fails on unmounting/exporting.
BTW: I think XFS on IRIX had the owning node name in the file system header,
and only would allow this node to mount the fs. But I can't find this now...
Maybe it's gone, or maybe it was in xlv.. ?
-jf
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