Re: What's better: Raid 0 or disk for seperate pg_xlog

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От Mario Weilguni
Тема Re: What's better: Raid 0 or disk for seperate pg_xlog
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Msg-id 200503101741.28407.mweilguni@sime.com
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Ответ на What's better: Raid 0 or disk for seperate pg_xlog  (Karim Nassar <Karim.Nassar@acm.org>)
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Am Donnerstag, 10. März 2005 08:44 schrieb Karim Nassar:
> From rom http://www.powerpostgresql.com/PerfList/
>
> "even in a two-disk server, you can put the transaction log onto the
> operating system disk and reap some benefits."
>
> Context: I have a two disk server that is about to become dedicated to
> postgresql (it's a sun v40z running gentoo linux).
>
> What's "theoretically better"?
>
> 1) OS and pg_xlog on one disk, rest of postgresql on the other? (if I
>    understand the above correctly)
> 2) Everything striped Raid 0?
> 3) <some answer from someone smarter than me>

Because of hard disk seeking times, a separate disk for WAL will be a lot
better.

regards

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