My project wish-list for the next 12 months
Wilko Bulte
wb at freebie.xs4all.nl
Thu Dec 2 11:13:04 PST 2004
On Wed, Dec 01, 2004 at 04:37:59PM -0700, Scott Long wrote..
> Jason C. Wells wrote:
> >--On Wednesday, December 01, 2004 3:02 PM -0700 Scott Long
> ><scottl at freebsd.org> wrote:
> >
> >>5. Clustered FS support. SANs are all the rage these days, and
> >>clustered filesystems that allow data to be distributed across many
> >>storage enpoints and accessed concurrently through the SAN are very
> >>powerful. RedHat recently bought Sistina and re-opened the GFS source
> >>code, so exploring this would be very interesting.
> >
> >
> >This sounds very close to OpenAFS. I don't know what distinguishes a
> >SAN from other types of NAS. OpenAFS does everything you mentioned in
> >the above paragraph. OpenAFS _almost_ works on FreeBSD right now.
> >
> >Later,
> >Jason C. Wells
>
> Well, AFS requires an intelligent node in front of each disk. True SAN
> clustering means that you have a web of disks directly connected to the
> SAN (iSCSI, FibreChannel, etc), and two or more servers on the SAN that
> see those disks as a single filesystem (actually a bit more complicated
> than this, but you get the point). If one server goes down, no access
> to data is lost since the disks can be reached from any other server on
> the SAN that is participating in the clustered FS.
Find a friendly TruCluster somewhere and take a look. Really Neat(tm).
Alternatively find a friendly OpenVMS cluster, they have forgotten more
about clusters now than Unix will ever learn (I am afraid).
While we are talking storage: multipathing support for SANs is a
very neat thing to have. Devices uniquely identified by WWN etc.
--
Wilko Bulte wilko at FreeBSD.org
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