| From: | "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | Henrik <henke(at)mac(dot)se> |
| Cc: | glynastill(at)yahoo(dot)co(dot)uk, "Greg Smith" <gsmith(at)gregsmith(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Filesystem benchmarking for pg 8.3.3 server |
| Date: | 2008-08-11 13:20:08 |
| Message-ID: | dcc563d10808110620t460b7928hffc2e350f04b9c58@mail.gmail.com |
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| Lists: | pgsql-performance |
On Mon, Aug 11, 2008 at 6:08 AM, Henrik <henke(at)mac(dot)se> wrote:
> 11 aug 2008 kl. 12.35 skrev Glyn Astill:
>
>>>>
>>>>> It feels like there is something fishy going on.
>>>
>>> Maybe the RAID 10
>>>>>
>>>>> implementation on the PERC/6e is crap?
>>>>
>>
>> It's possible. We had a bunch of perc/5i SAS raid cards in our servers
>> that performed quite well in Raid 5 but were shite in Raid 10. I switched
>> them out for Adaptec 5808s and saw a massive improvement in Raid 10.
>
> I suspected that. Maybe I should just put the PERC/6 cards in JBOD mode and
> then make a RAID10 with linux software raid MD?
You can also try making mirror sets with the hardware RAID controller
and then doing SW RAID 0 on top of that. Since RAID0 requires little
or no CPU overhead, this is a good compromise because the OS has the
least work to do, and the RAID controller is doing what it's probably
pretty good at, mirror sets.
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