Re: Correction : EMC symetrix - 1M stripe width - Raid 0+1 - Perform

From: Connor McDonald <hamcdc_at_yahoo.co.uk>
Date: Wed, 14 Nov 2001 02:24:47 -0800
Message-ID: <F001.003C441D.20011114021021@fatcity.com>

Interestingly you could go back to Oracle support and ask them about the "SAME" method (as presented by an Oracle employee if I recall correctly at a user conference) - which advocated 1m stripes.

You'll tend to face these battles with EMC - their sales people are great at things like "you don't need to worry about where things are on the disk, or striping etc - our cache takes care of all of that"...Yeah right!

As a general guideline, I think you'd be better of with smaller stripe size, but you don't have to limit yourself - you could have fine granined striping for some parts of the system, and larger grains for other parts.

hth
connor

• Mohammed.Ahsanuddin_at_VerizonWireless.com wrote: > Hi,
  >
  > Application : OLTP
  > Environment : Solaris 2.6 on a E10K
  > Database : 8.0.5.2.1
  >
  > We recently migrated from sun a5200 storage to EMC
  > symetrix, and we have
  > been seeing occasional performance problems. When
  > contacted, Oracle support
  > among other things pointed out the stripe width we
  > have used 1M, is very
  > large and also said users will not see an advantage
  > above 64K.
  >
  > When we had Sun storage before we had 64K as the
  > stripe width.
  >
  > Has anyone faced this kind of issue or has any
  > comments..or can someone
  > explain the low level impact of the stripe width on
  > the ORACLE I/O
  > operations?
  >
  > Much appreciated..
  >
  > Regards
  >
  > Mohammed Ahsanuddin
  > Oracle DBA
  > --
  > Please see the official ORACLE-L FAQ:
  > http://www.orafaq.com
  > --
  > Author:
  > INET: Mohammed.Ahsanuddin_at_VerizonWireless.com
  >
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Connor McDonald
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Received on Wed Nov 14 2001 - 04:24:47 CST