Re: RAID 1 or 5 ?

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Article #443

#443

From: Helen Quinn
Date: Mon, 02 Aug 1999 00:00

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What are the costs and benefits of RAID1 & RAID5, against RAID5
ONLY, in terms of I/O efficiency and extent of tolerance, as per
this scaled setup for 3 identical disks?  Any input is appreciated.
Thanks in advance.

RAID5 ONLY
        |-----------------------------|--------------|
  disk0 |         drive: "C"          | strip volume |
        |-----------------------------|--------------|
  disk1 |         drive: "D"          | strip volume |
        |-----------------------------|--------------|
  disk2 |         drive: "E"          | strip volume |
        |-----------------------------|--------------|

RAID1 & RAID5
        |--------------|--------------|------------- |
  disk0 | mirrored "C" | mirrored "E" | strip volume |
        |--------------|--------------|------------- |
  disk1 | mirrored "D" | mirrored "C" | strip volume |
        |--------------|--------------|------------- |
  disk2 | mirrored "E" | mirrored "D" | strip volume | 
        |--------------|--------------|------------- |

Best regards from Helen, away from home.

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From: hq@cheerful.com (Helen Quinn)
Subject: Re: RAID 1 or 5 ?
Date: 1999/08/02
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