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IDS Forum

AW: Tuning Checkpoints

Posted By: Andreas.KUTSCHE@spar.at
Date: Friday, 7 December 2007, at 4:45 p.m.

In Response To: Re: Tuning Checkpoints (Art S. Kagel (Oninit LLC))

Hi,

tuning KAIO on HPUX: I didn't know that there is much to tune, except to have enough async ports.
Are there interesting OS parameters?

Regards
Andreas Kutsche

>
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-------------------------------------------
-----Ursprüngliche Nachricht-----

> Von: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] Im Auftrag von Art
> S. Kagel (Oninit LLC)
> Gesendet: Freitag, 07. Dezember 2007 16:47
> An: ids@iiug.org
> Betreff: Re: Tuning Checkpoints [10654]
>
> ALICE BENNETT wrote:
> > I need some help getting checkpoints durations lowered. We are running
> > informix 9.4. I have been working with Informix Tech support and it has
> gotten
> > some better but it is not as good as it should be. We have been
> adjusting
> > BUFFERS, LRUS, CLEANERS, LRU_MAX_DIRTY, and LRU_MIN_DIRTY.
> >
> > BUFFERS = 350000
> > LRUS = 128
> > CLEANERS = 127
> > LRU_MAX_DIRTY = .5
> > LRU_MIN_DIRTY = .25
> >
> > After the last changes we made, LRU writes is now lower than chunk
> writes
> for
> > the first time.
> >
> > Our checkpoints have ranged up to 7 seconds and sometimes higher. Anyone
> have
> > any ideas of what else we can look at?
> >
>
> Are chunks using KAIO (ie are they RAW device)? If so you may have to
> tune the HPUX KAIO subsystem. Tuning KAIO on HPUX can make a huge
> difference in write times like checkpoint.
>
> Art S. Kagel
>
> > HP GL380G5 servers
> > 32Gb Memory
> > (2) quad core Processors
> > The dbspaces are located on Compellent SAN fiber channel drives RAID
> level
> 10
> > (striped and mirrored).
> >
> >
> >
> **************************************************************************
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> >
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>
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> Forum Note: Use "Reply" to post a response in the discussion forum.

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