RE: RAID or NOT to RAID? What's the diff???

From: Jon Baker <jcb_at_netsec.net>
Date: Mon, 13 Aug 2001 08:49:48 -0700
Message-ID: <F001.00368CAA.20010813085520@fatcity.com>

one is
mirrored stripes while the other is stripped mirrors.    ;-)
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  size=2>-----Original Message-----From: Koivu, Lisa   [mailto:lisa.koivu_at_efairfield.com]Sent: Monday, August 13, 2001   12:06 PMTo: 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 <FONT
  face=Batang>Lisa Koivu Oracle Database   Administrator Fairfield Resorts, Inc.   954-935-4117   

    -----Original Message----- <FONT

    face=Arial size=1>From:   <FONT face=Arial 
    size=1>Jonathan Lewis [SMTP:jonathan_at_jlcomp.demon.co.uk] <FONT 
    face=Arial size=1>Sent:   <FONT face=Arial 
    size=1>Saturday, August <FONT 
    face=Arial color=#0000ff size=2>[Koivu, Lisa]<FONT 
    face=Arial size=1>  11, 2001 4:25 AM <FONT face=Arial 
    size=1>To:     <FONT face=Arial 
    size=1>Multiple recipients of list ORACLE-L <FONT face=Arial 
    size=1>Subject:        <FONT 
    face=Arial size=1>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 <A target=_blank
    href="http://www.jlcomp.demon.co.uk/seminar.html">http://www.jlcomp.demon.co.uk/seminar.html     

    -----Original Message----- <FONT
    face=Arial size=2>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, <FONT face=Arial     size=2>|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 <FONT face=Arial     size=2>|comparable configuration using RAID 1+0, you will lose     |only 25% of your logical volume's I/O capacity.     | <FONT face=Arial
    size=2>|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 <FONT face=Arial     size=2>|loss in the I/O capacity for RAID 1+0 decreases. <FONT     face=Arial size=2>| |You should (when     possible) consider using RAID 1+0 any <FONT face=Arial     size=2>|day when compared to RAID 0+1.

• Please see the official ORACLE-L FAQ: <A target=_blank href="http://www.orafaq.com">http://www.orafaq.com <FONT face=Arial size=2>-- Author: Jonathan Lewis   INET: jonathan_at_jlcomp.demon.co.uk Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051 <FONT face=Arial size=2>San Diego, California        -- Public Internet access / Mailing Lists <FONT face=Arial size=2>-------------------------------------------------------------------- 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 <FONT face=Arial size=2>also send the HELP command for other information (like subscribing).

Received on Mon Aug 13 2001 - 10:49:48 CDT