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IDS Forum

Re: Tuning Checkpoints

Posted By: Art S. Kagel (Oninit LLC)
Date: Friday, 7 December 2007, at 10:46 a.m.

In Response To: Tuning Checkpoints (ALICE BENNETT)

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).
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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