From kgel@ppoone.com Mon, 13 Aug 2001 11:04:32 -0700 From: Kevin Lange Date: Mon, 13 Aug 2001 11:04:32 -0700 Subject: RE: RAID or NOT to RAID? What's the diff??? Message-ID: MIME-Version: 1.0 Content-Type: text/plain Title: RAID or NOT to RAID? What's the diff??? Take a look at http://www.acnc.com    Choose the raid.edu item on their menu bar (I think this brings you to http://www.acnc.com/04_00.html ) .    Read the explainations. -----Original Message-----From: Koivu, Lisa [mailto:lisa.koivu@efairfield.com]Sent: Monday, August 13, 2001 11:06 AMTo: Multiple recipients of list ORACLE-LSubject: 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@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 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@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@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).