Re: db datafiles on NetApp FAS940 filer
- From: Stephen Evans <evans036@xxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Wed, 11 Feb 2004 09:24:09 -0500
san storage is difficult to benchmark becuase it has such a huge cache
(usually at least 16GB) and becuase performance depends on what other
systems are using it.
for write intensive san is very fast (2 ~ 5 ms) until the cache fils up
and then you faced with synchronous disk access - which is frequently
raid5 (which is slow for writes).
also switches & san adapters are shared so that too can become a bottle
neck.
so you can see artificially high performance when you first benchmark your
shiny new san only to find its not nearly as fast when under stress
steve
Mladen Gogala <mladen@xxxxxxxxxxxxxxx>
Sent by: oracle-l-bounce@xxxxxxxxxxxxx
02/10/2004 05:32 PM
Please respond to oracle-l
To: oracle-l@xxxxxxxxxxxxx
cc:
Subject: Re: db datafiles on NetApp FAS940 filer
On 02/10/2004 05:07:31 PM, Joze Senegacnik wrote:
> Babette,
> some of my customers with SANs are far below that: from 2 to 5ms
> (normal
> load).
>
> Thanks!
> Joze
What SANs are that? EMC or HP/Hitachi? Those HP/Hitachi things are
really, really fast with decent amount of write-back cache, but for
some reason, much more software is available for EMC.
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