| From: | Bruno Wolff III <bruno(at)wolff(dot)to> |
|---|---|
| To: | "Jean-Yves F(dot) Barbier" <7ukwn(at)free(dot)fr> |
| Cc: | Hannes Dorbath <light(at)theendofthetunnel(dot)de>, pgsql-general(at)postgresql(dot)org, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Arguments Pro/Contra Software Raid |
| Date: | 2006-05-09 15:18:48 |
| Message-ID: | 20060509151848.GA11476@wolff.to |
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| Lists: | pgsql-general pgsql-performance |
On Tue, May 09, 2006 at 12:10:32 +0200,
"Jean-Yves F. Barbier" <7ukwn(at)free(dot)fr> wrote:
> Naa, you can find ATA &| SATA ctrlrs for about EUR30 !
But those are the ones that you would generally be better off not using.
> Definitely NOT, however if your server doen't have a heavy load, the
> software overload can't be noticed (essentially cache managing and
> syncing)
It is fairly common for database machines to be IO, rather than CPU, bound
and so the CPU impact of software raid is low.
> Some hardware ctrlrs are able to avoid the loss of a disk if you turn
> to have some faulty sectors (by relocating internally them); software
> RAID doesn't as sectors *must* be @ the same (linear) addresses.
That is not true. Software raid works just fine on drives that have internally
remapped sectors.
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