Thanks Cheng for your inputs On Tue, Jun 30, 2009 at 5:40 PM, LS Cheng <exriscer@xxxxxxxxx> wrote: > Hi > > If you want to use Volume Manager to manage Raw Device then you need a > Cluster Volume Manager. AFIAK a plain normal Volume Manager wont manage > consistency across the volumes. If it's plain Raw I guess Oracle Clusterware > handles it. > > When I said Raw Device I mean plain raw device, plain disk partition with > no Volume Group and Logical Volume whatsoever. > > In 9i you used a Clustered Volume Manager because you need a third party > Clustering Software in 9i to manage RAC so if you need a clustering software > why dont use the cluster volume manager which comes with it? (ok may be the > cost is a reason) > > > Corrections welcome > > Thanks > > -- > LSC > > > On Tue, Jun 30, 2009 at 1:57 PM, Sriram Kumar <k.sriramkumar@xxxxxxxxx>wrote: > >> Hi Hrishy/Cheng, >> >> Thanks for your inputs. I am not planning to use raw volumes for the DB. >> >> IIRC, in 9i we needed a Cluster Volume Manager for managing the raw >> volumes. in 10g, if we plan to use ASM then we dont need to go for Clustered >> volume manager as it comes along with the Sun/Veritas Clusterware and that >> is expensive. >> >> My question is if we plan to use ASM then ASM does not support OCR and >> voting disk (Cluster should be started before starting ASM) and you have to >> create it outside ASM and raw volumes with regular volume manager is the >> only option.i.e. i guess same disk mounted in both the nodes with regular >> volume manager. >> >> In this context, how does Oracle Clusterware manages the synchronization >> of data across nodes?. Is this handled by the clusterware. >> >> Now the next question. If this is infact supported then how difficult is >> to manage the datafiles as well in the similar method?. If you look at the >> storage certification matrix then this option of raw volumes without >> clustered volume manager is not supported. >> >> Best Regards >> Sriram Kumar >> >> >> >> >> >> >> On Tue, Jun 30, 2009 at 4:19 PM, hrishy <hrishys@xxxxxxxxxxx> wrote: >> >>> Hi Sriram >>> >>> You are correct. >>> You can use raw devices for datafiles in RAC.Infact OPS the predecssor of >>> teh modern day RAC was primarily using RAW devices. >>> >>> Howevr there are many limitations to raw devices that is why oracle first >>> came out with ocfs and then ASM which offer raw like performance minus the >>> overhead of managing them. >>> >>> I udnerstand that Oracle12g would not support raw devices a warning for >>> you if you intend to gow down that route with your RAC implementation >>> >>> >>> regards >>> Hrishy >>> >>> --- On *Tue, 30/6/09, Sriram Kumar <k.sriramkumar@xxxxxxxxx>* wrote: >>> >>> >>> From: Sriram Kumar <k.sriramkumar@xxxxxxxxx> >>> Subject: Re: CRS and Voting Disk Storage Options -- Oracle 10gR2 RAC on >>> Sun Sparc >>> To: "LS Cheng" <exriscer@xxxxxxxxx>, "List, Oracle-l Freelists" < >>> oracle-l@xxxxxxxxxxxxx> >>> Date: Tuesday, 30 June, 2009, 11:20 AM >>> >>> >>> Hi, >>> >>> One more question. if the data synchronization for OCR is managed with >>> shared raw volume and without a cluster volume manager, then the same logic >>> of synchronization should work for Oracle datafiles as well right?i.e..if >>> you create datafiles on raw volumes without cluster volume manager or >>> without ASM that should also work right?. >>> >>> Best Regards >>> >>> Sriram Kumar >>> >>> >>> >>> >>> >>> >>> >>> On Tue, Jun 30, 2009 at 3:18 PM, LS Cheng >>> <exriscer@xxxxxxxxx<http://uk.mc237.mail.yahoo.com/mc/compose?to=exriscer@xxxxxxxxx> >>> > wrote: >>> >>>> Hi >>>> >>>> Raw Devices can be shared, you dont need any Cluster Volume Manager to >>>> do so. >>>> >>>> >>>> Thanks >>>> >>>> -- >>>> LSC >>>> >>>> >>>> >>>> On Tue, Jun 30, 2009 at 11:46 AM, Sriram Kumar >>>> <k.sriramkumar@xxxxxxxxx<http://uk.mc237.mail.yahoo.com/mc/compose?to=k.sriramkumar@xxxxxxxxx> >>>> > wrote: >>>> >>>>> Hi Cheng, >>>>> >>>>> Thanks for the reply. how is the OCR and voting disk information >>>>> synchronized if it is not shared?. Pls help me understand >>>>> >>>>> Best regards >>>>> >>>>> Sriram Kumar >>>>> >>>>> >>>>> >>>>> >>>>> On Tue, Jun 30, 2009 at 2:59 PM, LS Cheng >>>>> <exriscer@xxxxxxxxx<http://uk.mc237.mail.yahoo.com/mc/compose?to=exriscer@xxxxxxxxx> >>>>> > wrote: >>>>> >>>>>> Hi >>>>>> >>>>>> You store OCR and Voting Disks on RAW Devices. You dont need any third >>>>>> party cluster for this >>>>>> >>>>>> >>>>>> Thanks >>>>>> >>>>>> -- >>>>>> LSC >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> On Tue, Jun 30, 2009 at 11:18 AM, Sriram Kumar < >>>>>> k.sriramkumar@xxxxxxxxx<http://uk.mc237.mail.yahoo.com/mc/compose?to=k.sriramkumar@xxxxxxxxx> >>>>>> > wrote: >>>>>> >>>>>>> Hi Folks, >>>>>>> >>>>>>> We are planning to implement a Sun SPARC based 10g R2 cluster. >>>>>>> >>>>>>> I see from the oracle link >>>>>>> >>>>>>> >>>>>>> http://www.oracle.com/technology/products/database/clustering/certify/tech_generic_unix_new.html >>>>>>> >>>>>>> That following storage options >>>>>>> >>>>>>> 1) Solaris Volume Manager for Sun Cluster >>>>>>> >>>>>>> 2) VERITAS Volume Manager (VxVM) with the cluster feature >>>>>>> >>>>>>> 3) Sun StorEdge QFS shared file system with hardware RAID support or >>>>>>> with Solaris Volume Manager for Sun Cluster >>>>>>> >>>>>> 4) Network Appliance network-attached storage (NAS) devices >>>>>> >>>>>> 5) Oracle Automatic Storage Management (ASM) >>>>>> >>>>>> We are looking at ASM but if we choose ASM then how will the Voting >>>>>> Disk and CRS would be managed? Do we still need Sun Cluster for managing >>>>>> this alone or how do you manage it?. Thanks in advance >>>>>> >>>>> >>>>> >>>>> Best Regards >>>>> >>>>> Sriram Kumar >>>>> >>>> >>>> >>>> >>>> >>>> >>>> >>> >>> >>> >>> >>> >>> >> >