| From: | Aidan Van Dyk <aidan(at)highrise(dot)ca> |
|---|---|
| To: | Mario Weilguni <mweilguni(at)sime(dot)com> |
| Cc: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Experience with HP Smart Array P400 and SATA drives? |
| Date: | 2008-12-10 15:52:08 |
| Message-ID: | 20081210155208.GR26596@yugib.highrise.ca |
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| Lists: | pgsql-performance |
* Mario Weilguni <mweilguni(at)sime(dot)com> [081210 07:31]:
> Why not? I know it's not performing as good as RAID-10, but it does not
> waste 50% diskspace. RAID-6 is no option, because the performance is
> even worse. And, on another system with RAID-5 + spare and SAS drives,
> the same controller is working very well.
Like Scott said, it's all about trade-offs.
With raid5, you get abysmal write performance, "make me not sleep at
night" inconsistent parity issues, and a degraded mode that will a
nightmare ...
... and as a trade-off you save a little money, and get good "read only"
performance ...
... as long as you don't ever have a disk or system crash ...
... or can afford to rebuild if you do ...
... etc ...
--
Aidan Van Dyk Create like a god,
aidan(at)highrise(dot)ca command like a king,
http://www.highrise.ca/ work like a slave.
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