Re: raid10 write performance - Mailing list pgsql-performance

From Ivan Voras
Subject Re: raid10 write performance
Date
Msg-id hvsueq$fh4$1@dough.gmane.org
Whole thread Raw
In response to Re: raid10 write performance  (Florian Weimer <fweimer@bfk.de>)
Responses Re: raid10 write performance  (Matthew Wakeling <matthew@flymine.org>)
Re: raid10 write performance  (Scott Marlowe <scott.marlowe@gmail.com>)
List pgsql-performance
On 06/23/10 14:00, Florian Weimer wrote:
> * Ivan Voras:
>
>> On the other hand, RAID10 is simple enough that soft-RAID
>> implementations should be more than adequate - any ideas why a dedicated
>> card has it "slow"?
>
> Barrier support on RAID10 seems to require some smallish amount of
> non-volatile storage which supports a high number of write operations
> per second, so a software-only solution might not be available.

If I understand you correctly, this can be said in general for all
spinning-disk usage and is not specific to RAID10. (And in the case of
high, constant TPS, no amount of NVRAM will help you).

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