Re: Configuring PostgreSQL to minimize impact of checkpoints

Love that froogle.

It looks like a nice card.     One thing I didn't get straight is if
the cache is writethru or write back.

If the original posters problem is truly a burst write problem (and not
linux caching or virtual memory overcommitment) then writeback is key.




> On Tue, 11 May 2004, Paul Tuckfield wrote:
>
>> If you are having a "write storm" or bursty writes that's burying
>> performance, a scsi raid controler with writeback cache will greatly
>> improve the situation, but I do believe they run around $1-2k.   If
>> it's write specific problem, the cache matters more than the striping,
>> except to say that write specfic perf problems should avoid raid5
>
> Actually, a single channel MegaRAID 320-1 (single channel ultra 320) is
> only $421 at http://www.siliconmechanics.com/c248/u320-scsi.php  It
> works
> pretty well for me, having 6 months of a production server on one with
> zero hickups and very good performance.  They have a dual channel intel
> card for only $503, but I'm not at all familiar with that card.
>
> The top of the line megaraid is the 320-4, which is only $1240, which
> ain't bad for a four channel RAID controller.
>
> Battery backed cache is an addon, but I think it's only about $80 or
> so.
>
>
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