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Re: switch from block to raw, & modify HP-UX bufca

Posted By: Art Kagel
Date: Wednesday, 25 May 2011, at 9:19 p.m.

In Response To: switch from block to raw, & modify HP-UX bufcache (NORMA JEAN SEBASTIAN)

Looks sound Norma Jean.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on my employer, Advanced DataTools, the IIUG, nor any other
organization with which I am associated either explicitly, implicitly, or by
inference. Neither do those opinions reflect those of other individuals
affiliated with any entity with which I am affiliated nor those of the
entities themselves.

On Wed, May 25, 2011 at 8:53 PM, NORMA JEAN SEBASTIAN <nj.sebby@gmail.com>wrote:

> Hi everybody,
>
> Informix Dynamic Server Version 11.70.FC1GE
> on HP-UX v11.11 (Risc)
>
> I am not a HP-UX admin, and it's been a long time since I've dealt with an
> Informix engine on block devices (I inherited, I didn't build it).
>
> I am seeking advice on whether my improvement plan below is going to
> work...
>
> background:
>
> I have recently discovered an HP-UX configuration issue causing both
> Informix
> and unix performance issues.
> There is 8 GB of physical memory, the unix i/o buffer cache is currently
> set
> to 4 GB (i believe this is a default setting, set to 50% of memory).
> Informix is the main application running on this box but starts up with
> only
> 960MB of memory/buffer cache. i did not dare increase it yet as OAT tells
> me
> there is less than 100MB of free memory on the box. (OAT has been very
> helpful).
>
> A couple weeks ago, while doing a large load, the Informix engine asked for
> another 500MB of memory. Unix gave the memory using swap space, but then
> began
> suffering significant performance problems resulting in a reboot.
>
> HP support has since advised me to reduce the unix i/o cache to 1 GB,
> freeing
> up 3 GB of memory.
>
> I desire to start informix up with a larger buffer cache, but i believe i
> should first move informix from block device paths to raw device paths.
>
> we do ontape level 0 backups every night. we do not have a huge problem
> getting maintenance outages and our DB is not real big.
>
> my plan is (does this make sense, you think it will work?):
>
> 1) do an ontape restore, renaming the block device chunk paths to links
> that
> point to the raw device paths
>
> - i believe this will then free up informix DB demands of the O/S buffer
> cache
> by going direct to disk instead of O/S buffering
> 2) now that informix is bypassing the unix buffercache, i can decrease the
> size of unix buffercache from 4GB down to 1GB as suggested by HP
> 3) having freed up approx 3 GB of memory, i can easily adjust Informix
> config
> to start up with 2GB of shared memory instead of the current 960MB.
>
> Do you think this will work? See any holes in my logic?
>
> I have an open ticket with both HP and IBM Informix but have not heard back
> from either regarding my plan...
>
> thanks for your feedback,
> Norma Jean Sebastian
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--bcaec50166b779fdec04a4239b51

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