Re: Q:To ASM or Not to ASM

  • From: Gopalakrishnan Kandhasamy <kaygopal@xxxxxxxxx>
  • To: AmihayG@xxxxxxxxx
  • Date: Tue, 12 Jul 2005 21:53:38 +0530


Comments inline..

> I work in R&D in my organization , and we need to decided if to cooperate
> ASM instead of some other LVM.
> I build a small list of advantanges and disadvantages on ASM , and some
> questions . I would like to hear you comments .

> disadvantages:
> 1. New technology . Not wide speared , most IT doesn't have enough knowledge
> in this area. 

Every technology is new for some time. That does not mean that we
should not use that. There are enough material available in public
domain for the basic users and soon some publications (hint:?) will be
available. So ASM wisdom may not be major issue in coming years.

> 2. Backup & recovery must be done using RMAN .

Only the current versions. 10g R2 gives the command line access (like
another filesystem) where you can copy, move, ftp files to the ASM
instance. Soon you can backup ASM using commnd line options..

And ofcourse Backup& Recovery using RMAN is a best practice (!)

> 3. Single point of failure - If ASM instance is down ( , I'm not sure about
> this point).

THis is true for any volume manager. btw you can RACify (means ASM
Instance can be run in RAC mode) the ASM instance so that the single
point of failure can be eliminated. No need to worry about the single
point of failure issues.

> My questions are :
> 1. Do you think that ASM will be acceptable next year as LVM solution for
> oracle database in big companies ?

I see ASM is going to replace most of the expen$ive volume managers in
next versions and after some time, ASM may be the _only_ storage
option for the data files.. But that will be a long way from now. ASM
is improving and will be an accptable solution in many data certers.

> 2. Do you think that ASM can be fine tuned as you can tune in a file base
> level installation ? 

You don't need to tune the ASM. It is SAME concept.


Best Regards,
K Gopalakrishnan 
Co-Author: Oracle Wait Interface, Oracle Press 2004

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