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Home -> Community -> Mailing Lists -> Oracle-L -> Re: RAID or NOT to RAID? What's the diff???
Hi,
>From an article by Gaja Krishna Vaidyanatha:
RAID 0+1 = "Stripe First, Then Mirror What You Just Striped"
RAID 1+0 = "Mirror First, Then Stripe Over What You Just Mirrored".
This site was recommended:
http://www.quest.com/whitepapers/
Hope this helps,
Denmark W.
>From: "Koivu, Lisa" <lisa.koivu_at_efairfield.com>
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: RAID or NOT to RAID? What's the diff???
>Date: Mon, 13 Aug 2001 08:05:42 -0800
>
>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-L
> > Subject: 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
> >
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Denmark Weatherburne INET: denmark_weatherburne_at_hotmail.com 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 - 12:42:34 CDT
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