I don't think there is anything wrong with wasting the space... except the actual wasting the space thing. But as for performance/best practices it's preferrable. Never forget that I come from a third world country, where customer pay for each GB of storage, so they refuse to waste even a single MB. I had a hard enough time explaining what OCR/Voting was so they'd approve the LUNs for them...and they were 100M LUNs... XD However, OCFS2 or any clustered filesystem is a valid option (if it works) to store OCR/Voting. hth Alan Bort Oracle Certified Professional On Wed, Jun 3, 2009 at 7:32 PM, Sanjay Mishra <smishra_97@xxxxxxxxx> wrote: > Thanks Matt > > ------------------------------ > *From:* Matthew Zito <mzito@xxxxxxxxxxx> > *To:* Sanjay Mishra <smishra_97@xxxxxxxxx>; oraclelist@xxxxxxxxxxxxx; > oracle-l@xxxxxxxxxxxxx > *Sent:* Wednesday, June 3, 2009 6:25:31 PM > > *Subject:* RE: RAC OCR/Voting Size > > > Yes, I would take three luns, make small partitions on two of them for OCR, > and on all three for voting, and then use the rest of the space on the disks > for ASM. Now, no disk space wasted. > > As far as why you can't access the devices, have your SAN admin open a case > with EMC - there may be FA bits that need to be flipped for RAC support. > > Matt > > -- > Matthew Zito > Chief Scientist > GridApp Systems > P: 646-452-4090 > mzito@xxxxxxxxxxx > http://www.gridapp.com > > > > -----Original Message----- > From: Sanjay Mishra [mailto:smishra_97@xxxxxxxxx <smishra_97@xxxxxxxxx>] > Sent: Wed 6/3/2009 6:24 PM > To: Matthew Zito; oraclelist@xxxxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx > Subject: Re: RAC OCR/Voting Size > > Matt > > These are completely new EMC SAN but SAN admin says that all space is > allocated and cannot be changed. So if I have to redundancy at Cluster level > is it 5 Lun and so wastes of 100's of gigabytes waste. > > ANother question I am working on this AIX server and getting the issue in > sharing this LUN among three Nodes. I checked that LUN assigned are having > PVID none and no_reserve=no and permission are correct. SAN people also says > that permission are correct as per other RAC environment. Cluster start is > giving error > > OCR initialization failed accessing OCR device: PROC-26: Error while > accessing the physical storage Operating System error [Device busy] [16] > > So only One node is coming up and if i stopped that node, then Cluster is > coming on Second Node. > > Is there any document that can tell as what setting are required to be > checked on EMC side for OCR Luns > > Sanjay > > ________________________________ > > From: Matthew Zito <mzito@xxxxxxxxxxx> > To: oraclelist@xxxxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx > Sent: Wednesday, June 3, 2009 5:41:32 PM > Subject: RE: RAC OCR/Voting Size > > > > So, there are storage arrays where once a fixed volume size is defined, it > is extremely difficult/expensive/risky to modify it, or provide alternately > sized devices. Older IBM and EMC arrays had this limitation - hearkens back > to the mainframe days, actually. > > > > If this is a linux system, you could put an OCFS2 filesystem on both of the > devices, and then keep extra control files, etc. there. > > > > Matt > > > > ________________________________ > > From: oracle-l-bounce@xxxxxxxxxxxxx > [mailto:oracle-l-bounce@xxxxxxxxxxxxx<oracle-l-bounce@xxxxxxxxxxxxx>] > On Behalf Of Randy Johnson > Sent: Wednesday, June 03, 2009 3:37 PM > To: oracle-l@xxxxxxxxxxxxx > Subject: RE: RAC OCR/Voting Size > > > > Or you could just use 1 partition from each of several LUNs for your OCR & > Voting. Use the rest of the space on each LUN for something else like ASM > volumes. > > > > By the way I find it hard to believe your storage admin cannot give you > less than 75G LUN's. It is probably more "rather not" than "cannot". > > > > -Randy > > > > From: oracle-l-bounce@xxxxxxxxxxxxx > [mailto:oracle-l-bounce@xxxxxxxxxxxxx<oracle-l-bounce@xxxxxxxxxxxxx>] > On Behalf Of Mark W. Farnham > Sent: Wednesday, June 03, 2009 3:46 AM > To: cicciuxdba@xxxxxxxxx; smishra_97@xxxxxxxxx > Cc: oracle-l@xxxxxxxxxxxxx > Subject: RE: RAC OCR/Voting Size > > > > While that indeed should work, it has all the same use profile problems of > putting all your control file copies on the same LUN. > > > > My advice would be to "waste" the excess space on each LUN. Further, the > LUNs thus "wasted" should ideally be composed of media using disjoint > components all the way down to the physical media. > > > > This may be a case where SSD could usefully be worked into the storage > matrix, since the waste savings might well pay for the required amount of > SSD. > > > > Regards, > > > > mwf > > > > ________________________________ > > From: oracle-l-bounce@xxxxxxxxxxxxx > [mailto:oracle-l-bounce@xxxxxxxxxxxxx<oracle-l-bounce@xxxxxxxxxxxxx>] > On Behalf Of Guillermo Alan Bort > Sent: Tuesday, June 02, 2009 10:41 PM > To: smishra_97@xxxxxxxxx > Cc: oracle-l@xxxxxxxxxxxxx > Subject: Re: RAC OCR/Voting Size > > > > You can have a single LUN and have separate partitions within that LUN for > OCR/Voting, and leave the rest as ASM disks. > > hth > Alan Bort > Oracle Certified Professional > > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 4128 (20090603) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 4128 (20090603) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com <http://www.eset.com/> > > > > >