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Home -> Community -> Mailing Lists -> Oracle-L -> RAID or NOT to RAID? What's the diff???
Good morning -
Admitting ignorance here. What is the difference between Raid 0+1 and Raid 1+0 (is this mirroring)? If someone can forward a website that describes the difference I would really appreciate it.
Thanks
Lisa Koivu
Oracle Database Administrator
Fairfield Resorts, Inc.
954-935-4117
-----Original Message-----
From: Jonathan Lewis [SMTP:jonathan_at_jlcomp.demon.co.uk] Sent: Saturday, August [Koivu, Lisa] 11, 2001 4:25 AM To: Multiple recipients of list ORACLE-LSubject: Re: Fwd: RE: RAID or NOT to RAID?
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 Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Mon Aug 13 2001 - 11:57:16 CDT
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