Re: AIX 5.2 move from JFS to JFS2

Patty,

What version of AIX are you on?  As you're probably aware,  db_block_buffers
is deprecated in favor of db_cache_size.  If you're using Automatic Memory
Management, you need to look at a couple of things, including
pga_aggregate_target, before increasing your cache size.  Best to run a
statspack to get some more input.  Increasing the cache size may help
alleviate your issue, also check your db_file_multiblock_read count.

On 6/27/07, Patty.Charlebois@xxxxxxxxxxxxxx <Patty.Charlebois@xxxxxxxxxxxxxx>
wrote:

Now that I have upgraded our production systems from 9.2.0.7 to 10.2.0.3 I
can see via truss that Oracle is taking advantage of our newly implemented
JFS2 filesystems and opening the datafiles using CIO.

We are experiencing higher WIO percentages since the upgrade.

My sysadmn has suggested that perhaps I need to increase db_block_buffers
to make up for the lack of buffering at the FS level now that we are using
JFS2.

Does anyone have any experience and/or thoughts regarding this?

TIA,
Patty


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