Re: Concurrent mount of XFS over SAN

[kris buggenhout <kris.buggenhout@xxxxxxxxx>]

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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