Re: CRS and Voting Disk Storage Options -- Oracle 10gR2 RAC on Sun Sparc

On Tue, Jun 30, 2009 at 5:40 PM, LS Cheng <exriscer_at_gmail.com> 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_at_gmail.com>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_at_yahoo.co.uk> 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_at_gmail.com>* wrote:
>>>
>>>
>>> From: Sriram Kumar <k.sriramkumar_at_gmail.com>
>>> Subject: Re: CRS and Voting Disk Storage Options -- Oracle 10gR2 RAC on
>>> Sun Sparc
>>> To: "LS Cheng" <exriscer_at_gmail.com>, "List, Oracle-l Freelists" <
>>> oracle-l_at_freelists.org>
>>> 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_at_gmail.com<http://uk.mc237.mail.yahoo.com/mc/compose?to=exriscer_at_gmail.com>
>>> > 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_at_gmail.com<http://uk.mc237.mail.yahoo.com/mc/compose?to=k.sriramkumar_at_gmail.com>
>>>> > 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_at_gmail.com<http://uk.mc237.mail.yahoo.com/mc/compose?to=exriscer_at_gmail.com>
>>>>> > 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_at_gmail.com<http://uk.mc237.mail.yahoo.com/mc/compose?to=k.sriramkumar_at_gmail.com>
>>>>>> > 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
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>

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