Parallel databases on linux HA?

[Cary B. O'Brien]

[may be duplicate -- ISP flaking out]

> Chrisman <incubus@netcom.com> 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?

-- cary

> -- 
> Excessive login or logout messages are a sure sign of senility.
>