Parallel databases on linux HA?
Cary B. O'Brien
Sat, 21 Nov 1998 10:27:11 -0500 (EST)
[may be duplicate -- ISP flaking out]
> Chrisman <firstname.lastname@example.org> wrote:
> > One application of HA that I work with is parallel database
> > servers such at Oracle Parallel Server.. I've worked with
> > this on both Sun Cluster 2.1 and MC/lockmanager (HP MC/Serviceguard
> > with extensions to support OPS). (And will be soon on DEC trucluster
> > PDB and possibly IBM HACMP)
> Has been supported with HACMP for ages... You need the Concurrent Resource
> Manager part.
> > Since Oracle now supports linux.. it would be interesting to try getting
> > OPS running.. though I don't even know if they included the ogmsd in the
> > linux distribution.. I will check...
> The bad news with Linux is that we still don't have raw disk devices, i.e.
> those which are not handled by the buffer cache. That way, the OPS has no
> way of being sure commits are physically written. I have been talking to
> davem at the Wuerzburg Linux Congress 1997, and he confirms the need but no
> one has been working on it so far as it seems. It appears Linus himself is
> the major obstacle to raw devices.
mount for Linux seems to have an sync option. It says 'All IO to the
file system should be don synchronously.
Does this help?
> Excessive login or logout messages are a sure sign of senility.