Hi Jonathan,
Indeed! Thanks for pointing the additional benefit one
gets during the "resilvering" process of the logical
volume when using RAID 1+0.
Cheers,
Gaja
- Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
wrote:
>
> You could also mention that when you have
> to resilver on RAID 1+0 after a disk fails,
> you only have to resilver one disk.
>
> On RAID 0+1 you have to resilver all the
> disc in the stripe.
>
>
> Jonathan Lewis
>
> Seminars on getting the best out of Oracle
> Last few places available for Sept 10th/11th
> See http://www.jlcomp.demon.co.uk/seminar.html
>
>
>
>
> -----Original Message-----
> To: Multiple recipients of list ORACLE-L
> <ORACLE-L_at_fatcity.com>
> Date: 11 August 2001 01:13
>
>
> |
> |For e.g, if you have a 2-way striped mirrored
> volume,
> |when you lose 1 drive in the volume, with RAID 0+1
> you
> |will lose 50% of the logical volume's I/O capacity,
> as
> |the whole member of the logical volume is shot,
> |because the stripe becomes totally invalid. With a
> |comparable configuration using RAID 1+0, you will
> lose
> |only 25% of your logical volume's I/O capacity.
> |
> |When the striped volume is a 4-way stripe, again
> with
> |1 drive loss, with RAID 0+1 you will lose 50% of
> I/O
> |capacity versus with RAID 1+0, you will only lose
> 12
> |1/2 %. As your stripe-width increases, the
> percentage
> |loss in the I/O capacity for RAID 1+0 decreases.
> |
> |You should (when possible) consider using RAID 1+0
> any
> |day when compared to RAID 0+1.
>
>
>
> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> --
> Author: Jonathan Lewis
> INET: jonathan_at_jlcomp.demon.co.uk
>
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Gaja Krishna Vaidyanatha
Director, Storage Management Products,
Quest Software, Inc.
Co-author - Oracle Performance Tuning 101
http://www.osborne.com/database_erp/0072131454/0072131454.shtml
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Gaja Krishna Vaidyanatha
INET: oraperfman_at_yahoo.com
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Received on Sun Aug 12 2001 - 16:07:15 CDT