Hi, Thanks Riaan/Bob for the explanations. It helps me a lot and thanks to Ceslo, you asked what I finally wanted. Thanks and regards - Hirantha > -----Original Message----- > From: linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster- > bounces@xxxxxxxxxx] On Behalf Of Celso K. Webber > Sent: Thursday, August 17, 2006 12:48 AM > To: linux clustering > Subject: Re: Which lock manager to use on a 2-node GFS > Cluster? > > Hi Riaan, > > Thank for your excelent explanation! > > Now I know I'll have to run an Oracle unsupported environment ... :) > > Would someone please confirm if the environment suggested by Hirantha is > supported by Red Hat? > > * 2 GFS/RAC nodes; > * 2 DLM on RAC/GFS nodes; > * fibre channel external storage. > > The above environment is what we usually encounter on our cluster > projects. Sometimes Oracle Database is installed as active-passive (not > a RAC Cluster). It would be useful to know if Red Hat supports it, even > if Oracle does not. > > Last question: does Oracle supports a 2-node cluster using DLM for > Oracle Database (no RAC, no GFS) when used with RHCS? > > Thanks again! > > Celso. > > > Riaan van Niekerk escreveu: > > hi Hirantha > > > > short answer: "No" > > > > If you are willing to settle for "should work just fine" instead of > > "certified by Oracle" you can try running DLM on 2 RAC/GFS nodes, then > > "yes" > > > > To have your solution certified/supported by Oracle, for a minimal > > configuration you need 5 machines: > > a) 2 GFS/RAC nodes > > b) 3 external GULM lock servers > > > > We also found these system requirements somewhat excessive (having more > > lock servers than actual GFS-accessing cluster nodes). > > > > more notes: > > - supported GFS with RAC is GULM only - DLM is not supported by Oracle, > > because it is embedded by default. > > > > - external lock servers - that means the the GULM service cannot run on > > the nodes accessing the GFS. The 3 GULM nodes and the 2 GFS/RAC nodes > > must be completely separate > > > > - the reason for the separation of lock servers from GFS/RAC nodes is > > that Oracle RAC is designed to be able to with a single node up, whereas > > DLM needs a quorum of 50%+1 to operate. Also, external lock servers > > allow you to reboot any RAC node without causing the lock server to > switch. > > > > - specs for the locks servers are as entry-level as you can get for > > modern server hardware, e.g. 1CPU, 1GB RAM. > > > > - Red Hat Knowledge base article for RAC on GFS: > > http://kbase.redhat.com/faq/FAQ_78_3853.shtm > > It mentions GFS 6.0, (slightly out of date) but is just as relevant for > > GFS 6.1 / RHEL 4). According to this article, "Red Hat does not charge > > for Red Hat GFS nodes that are used only for the external lock server > > configuration" > > > > - the Cluster/GFS FAQ has some URLs for RAC on GFS: > > http://sources.redhat.com/cluster/faq.html#gfs_oraclerac > > > > - MetaLink Note 329530.1 is the definitive source for what exactly is > > supported by Oracle, w.r.t. RAC and GFS. Unfortunately it is only > > available via Metalink. > > > > Celso - answers to your questions below > ... > -- > *Celso Kopp Webber* > > celso@xxxxxxxxxxxxxxxx <mailto:celso@xxxxxxxxxxxxxxxx> > > *Webbertek - Opensource Knowledge* > (41) 8813-1919 > (41) 3284-3035 > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
