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

From: Kevin Lange <>
Date: Mon, 13 Aug 2001 11:04:32 -0700
Message-ID: <>

Take a
look at   
Choose the item on their menu bar (I think this brings you to <A href=""> ) .    Read the explainations.

  <FONT face=Tahoma
  size=2>-----Original Message-----From: Koivu, Lisa   []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 <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 [] <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

    -----Original Message----- <FONT
    face=Arial size=2>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, <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.

Received on Mon Aug 13 2001 - 13:04:32 CDT

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