[geeks] RAID0+1 and ideas, etc...

[Nick B]

Each of those FusionIO cards is specced at a hair under 500k IOPS.  At the
edge of their envelope nanoseconds matter.  From mails after this it sounds
like they are well inside the envelope, so raid5 probably wouldn't matter.
Even adding one nanosecond per IOP would be 0.0005 seconds per second,
which may not sound like much, but it adds up.

Anyway, all of this is irrelevant to this case, and I think based on
current info what he's doing is fine, if silly.
Nick


On Thu, Nov 7, 2013 at 2:25 PM, Patrick Giagnocavo <patrick at zill.net> wrote:

> I am willing to believe you, but why?  So you dedicate maybe 50% of 1 core
> to RAID checksums...
>
> ----- Original Message -----
> From: "Nick B" <nick at pelagiris.org>
> To: "The Geeks List" <geeks at sunhelp.org>
> Sent: Thursday, November 7, 2013 12:16:34 PM GMT -07:00 US/Canada Mountain
> Subject: Re: [geeks] RAID0+1 and ideas, etc...
>
> RAID 5 (or 6, or 4, or any cpu intensive raid) on a FusionIO card is a very
> bad idea.
> Nick
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