[OpenAFS] Re: High Available Transparent Shared-Disk

Matt W. Benjamin matt@linuxbox.com
Mon, 11 Apr 2011 12:13:41 -0400 (EDT)


The variant of OpenAFS called rxosd has write mirroring, too, I believe (currently, this is a fork, has quite a number of differences to OpenAFS).  However, my intuition is that some other system would work better for this use case.  Just speculatively,

1. you might find the mirroring in glusterfs useful for this (but this is not an endorsement, I have never used it)

2. you might find that rather than a distributed file system (especially a system optimized for scale out, like AFS or Coda) that you really want a replicated or distributed database (I don't have a specific recommendation, but I think a number of freely available systems will synchronously mirror writes)


----- "Andrew Deason" <adeason@sinenomine.net> wrote:

> On Sun, 10 Apr 2011 03:45:54 -0700 (PDT)
> a a <msmfree2@yahoo.com> wrote:
> However, it is still possible today to achieve some kind of
> read-write
> replication with OpenAFS volumes by just using some other kind of
> underlying storage. If you create your AFS volumes on a SAN, or
> DRBD-backed storage, you can achieve redundancy for read-write data
> if
> you bring up a fileserver on another machine when an outage occurs.
> Many sites have AFS data on a SAN that they can quickly serve from
> different fileservers, and I know of at least one site that has
> DRBD-backed fileservers that I believe have worked well.
> Also, since you seem to be asking this same question of several
> projects
> (the exact same question, in fact :), you may want to look at the
> Coda
> filesystem. Coda is very AFS-like, and offers built-in read-write
> replication. I believe it is not as mature/stable as OpenAFS, but you
> can judge for yourself if it fits your needs.
> -- 
> Andrew Deason
> adeason@sinenomine.net
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Matt Benjamin

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