Re: EBS & ASM best practices and suggestions
- From: Yury Velikanov <j.velikanovs@xxxxxxxxx>
- To: ora-apps-dba@xxxxxxxxxxxxx
- Date: Thu, 19 Nov 2009 21:16:45 +1100
Pravin,
I have got a slide from my ASM presentation for you (in attachment).
Please have a look. The point it that ASM handles extremely simple
task to maintain file extend map.
The junior programmer would write that code in a few weeks :)
The point is that ASM is 6 years in the market and extremely simple
peace of code.
I would say any files system drivers (kernel code) is significantly complicated.
From personal experience could say that I didn't sow any serious
problem with basic ASM functionality during last 2 years. At the same
time you might meet some bugs if would use some "advanced" features
like online rebalancing etc.
PS If anyone is interested in the full text of presentation just drop
me an email.
Regards,
Yury
On Wed, Nov 18, 2009 at 4:38 PM, Pravin RC <pravinrc@xxxxxxxxx> wrote:
> HI,
>
> Thanks guys for your inputs it will help me debeting :) on the use of ASM.
>
> My concern is also you have to maintain another database for ASM and if that
> goes down means u cant access the filesystem and hence the db, and if you
> want to use ASM with RAC then you have to maintain ASM instance on the
> participating nodes.
>
> thanks
> Pravin
> On Wed, Nov 18, 2009 at 12:18 AM, Luis Freitas <lfreitas34@xxxxxxxxx> wrote:
>>
>> Yuri,
>>
>> I mean that before 10g, if you needed something similar to what ASM
>> offers in terms of manageability, you would need to purchase Veritas CFS for
>> Oracle, or other similar product (HP, IBM, Sun), and these tools were, and
>> still are, very expensive.
>>
>> If you didn't, you would be forced to use raw devices, with all the
>> management headaches it has.
>>
>> Best regards,
>> Luis Freitas
>>
>> --- On Tue, 11/17/09, Yury Velikanov <j.velikanovs@xxxxxxxxx> wrote:
>>
>> > From: Yury Velikanov <j.velikanovs@xxxxxxxxx>
>> > Subject: Re: EBS & ASM best practices and suggestions
>> > To: ora-apps-dba@xxxxxxxxxxxxx
>> > Date: Tuesday, November 17, 2009, 11:40 AM
>> > > I kinda dislike the
>> > absence of "fsck like" tools for ASM, and the lack of backup
>> > superblocks, not sure if this changed in 11g.
>> > It is there now with new ASM Volume Manager and ASM Cluster
>> > File
>> > system :) However you don't need it for DB files any way.
>> > There are other methods checking Oracle DB files
>> > integrity.
>> >
>> > > Aside from that I feel it is a killer
>> > product. Similar functionality with cluster filesystems cost
>> > hundreds of thousands of dollars, except in the case you go
>> > for OCFS2, and that is available for linux only.
>> > Not sure what do you mean by "cost hundreds of thousands of
>> > dollars"
>> > as ASM is for free. It doesn't cot you anything (You have
>> > Oracle DB
>> > licenses anyway ;)
>> >
>> > Yury
>> >
>> > On Wed, Nov 18, 2009 at 12:35 AM, Luis Freitas <lfreitas34@xxxxxxxxx>
>> > wrote:
>> > > Yuri,
>> > >
>> > > I kinda dislike the absence of "fsck like" tools for
>> > ASM, and the lack of backup superblocks, not sure if this
>> > changed in 11g.
>> > >
>> > > Aside from that I feel it is a killer product.
>> > Similar functionality with cluster filesystems cost hundreds
>> > of thousands of dollars, except in the case you go for
>> > OCFS2, and that is available for linux only.
>> > >
>> > > Best Regards,
>> > > Luis Freitas
>> > >
>> > > --- On Tue, 11/17/09, Yury Velikanov <j.velikanovs@xxxxxxxxx>
>> > wrote:
>> > >
>> > >> From: Yury Velikanov <j.velikanovs@xxxxxxxxx>
>> > >> Subject: EBS & ASM best practices and
>> > suggestions
>> > >> To: ora-apps-dba@xxxxxxxxxxxxx
>> > >> Date: Tuesday, November 17, 2009, 10:50 AM
>> > >> Hello Pravin,
>> > >>
>> > >> If you are planning to run EBS in RAC
>> > configuration what
>> > >> possible options do you have for Storing DB files
>> > ?
>> > >> RAW devices (block devices) - Best DB IO
>> > performance -
>> > >> Manageability is rubbish
>> > >> Cluster FS - rubbish performance / technical
>> > complexity /
>> > >> costs - Good Manageability
>> > >>
>> > >> ASM - Best DB IO performance - Good Manageability
>> > -
>> > >> Mirroring/Striping out of the box - Mainstream
>> > today &
>> > >> Oracle Future (11GR2 introduced ACFS - ASM Cluster
>> > File
>> > >> System)
>> > >>
>> > >> From my point of view you do not have other
>> > options :)
>> > >>
>> > >> End of the day ASM isn't a rocket since. It is a
>> > very
>> > >> simple product covering very simple operations
>> > (files extent
>> > >> map synchronization)
>> > >>
>> > >> If you have any questions on doubts please do not
>> > hesitate
>> > >> to share those with us.
>> > >>
>> > >>
>> > >> PS ASM topic is kind of HOT for me now as I just
>> > delivered
>> > >> the following paper during annual Australian User
>> > Group
>> > >> Automatic Storage Management
>> > >> - 11G
>> > >> R2 features for mission critical
>> > systems
>> > >>
>> > >> All the best with your projects,
>> > >> Yury
>> > >>
>> > >>
>> > >> On Mon, Nov 16, 2009 at 5:30 PM, Pravin RC <pravinrc@xxxxxxxxx>
>> > >> wrote:
>> > >>
>> > >> Guys,
>> > >>
>> > >> Sorry this is not ASM thread, but i want to
>> > discuss
>> > >> the use and experience of ASM.
>> > >>
>> > >> I am in design phase we will have 2 node RAC and
>> > ASM(
>> > >> best practise and MAA). i am bit skiptical on use
>> > of ASM as
>> > >> it is adding additional maintenance of ASM
>> > instances on
>> > >> each node. And again copying files into and from
>> > will be
>> > >> another challenge. Guys could you please discuss
>> > your your
>> > >> experience on ASM use.
>> > >>
>> > >>
>> > >>
>> > >> thanks
>> > >>
>> > >> Pravin
>> > >>
>> > >>
>> > >>
>> > >>
>> > >>
>> > >
>> > >
>> > >
>> > >
>> > >
>> >
>> >
>> >
>> > --
>> > Yury
>> > Oracle Certified Master
>> > Mobile number: +61 405728926
>> > ============================================
>> > http://otn.oracle.com/ocm/jvelikanovs.html
>> >
>> >
>>
>>
>>
>>
>
>
>
> --
> Regards,
> Pravin R C
>
--
Yury
Oracle Certified Master
Mobile number: +61 405728926
============================================
http://otn.oracle.com/ocm/jvelikanovs.html
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