Re: raid 5 advice
From: Allen (spam_at_swnews.net)
Date: 07/09/03
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Date: Wed, 09 Jul 2003 09:50:08 -0700
no body wrote:
> With raid 5 you lose one unit to parity (I realize it's not just one unit,
> it's stripped across the entire raid).
>
> Which would be better with 4 160 Gig drives using software raid:
>
> 1. 4 160 Gig units, losing 160 Gig to parity for a total usable of 480
> Gig.
> 2. 8 80 Gig partitions, losing 80 Gig to parity for a total usable of 560
> Gig.
> 3. 16 40 Gig partitions, losing 40 Gig to parity for a total usable of
> 600 Gig.
> 4.... You get the idea.
>
> I realize with each division there is a little loss to performance, but
> overall the data is stripped across all the disks, so the performance
> penality may not be that much compared to the gain of storage space.
>
> Ideas? Experiences?
>
> Thanks!
Performance will increase with each additional spindle added to a raid 5
array due to the effect of striping, but there is an increase in the number
of interrupts with software raid.
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