Hi Amit,
YOu can use Sun storage it self instead of EMC, they got Sun Cluster
configuartion on Hitiche Storage.
sroesch3_at_attbi.com (Steve) wrote in message news:<efc3f20b.0206071840.179616e6_at_posting.google.com>...
> "Amit Ghosh" <aghosh6_at_attbi.com> wrote in message news:<nG7M8.133311$ux5.182296_at_rwcrnsc51.ops.asp.att.net>...
> > I am interested in setting up a RAC ( Real Application Clusters) environment
> > using SUN hardware and EMC disk subsystems.
> >
> > Some issues
> >
> > 1) Is using Sun machines with EMC disks certified for RAC ? I do understand
> > fromm Metalink that Oracle corp. only certifies only software required but
> > the hardware is certified by the vendors. It would seem that sun should
> > certify the usage of EMC with their systems but there probably is a conflict
> > of interest here. Is anyone using RAC on SUN systems with EMC disks ?
> >
> > 2) We would like to use 3 nodes in the cluster. Again metalink says that
> > only two nodes are supported RAC/Sun Cluster 3.0 environment. However there
> > is a caveat in the following explanation given :
> >
> > "Sun Cluster 3.0 supports up to eight cluster nodes. Sun plan to extend this
> > to 64 nodes eventually. Sun Cluster v2.2 had a previous limit of four nodes.
> > Real Application Clusters (RAC) is supported with Solaris 8 (v2.8) and Sun
> > Cluster 3.0, though only two nodes are supported at this current stage. The
> > limitation on SC 3.0/RAC is due to the implementation of SCSI 3 Persistent
> > Group Reservation PGR in the storage subsystem. SC 3.0 uses PGR for quorum
> > management for more than 2 nodes. SCSI 2 Reserve is used by SC 2.2 and 3.0
> > for 2 node clusters. SC 2.2 uses a terminal concentrator for greater than 2
> > nodes. Sun will support PGR in T3 storage in an update but Sun will not
> > support PGR in earlier storage offerings (e.g., photons - A5200). EMC,
> > however, does supports PGR and these third-party vendors are now responsible
> > for certification against Sun Cluster. Sun Cluster 3.0 RAC support will be
> > certified to 4 nodes when the T3 storage upgrade is released. Certification
> > to 8 nodes will happen at a later date"
> >
> > The key line here is "EMC, however, does supports PGR and these third-party
> > vendors are now responsible for certification against Sun Cluster". Does
> > this mean then that we might be able to use a 3 node cluster when using EMC
> > disks.?
> >
> > Any insights or experiences would be appreciated.
> >
> > Amit
> Hi Amit,
>
> AFAIK the limitation is because of a hardware limit of the sun
> storage. This hardware limit was solved I think in the last weeks.
> Currently they are able to support 4 node clusters.
> To use EMC and Sun in the same cluster you have to get some form of
> confirmation from sun that they support this configuration. There are
> customer's which are running with that configuration.
>
> Regards
> Steve
Received on Sat Jun 08 2002 - 09:57:34 CDT
