Re: RAID 1 or 5 ?

Article View: comp.arch.storage

Article #439

#439

From: Helen Quinn
Date: Sat, 31 Jul 1999 00:00

33 lines
2297 bytes

"Ron Reaugh" <Ron-Reaugh@worldnet.att.net> wrote:
>highend wrote in message <7nsoie$5g1$2@birch.prod.itd.earthlink.net>...
>-snip
>>RAID 5 would only support the loss of one drive at a time
>>and i can't think of anything that would support the loss of "any"
>>2 drives at once
>
>Three drive RAID 1 or mirrored RAID5 arrays.

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.

Technical Details

Message-ID: <37ab7d33.12088492@news.seed.net.tw>

Path: arc1-ca.pugleaf.net!unknown!not-for-mail

References:

<7nl85m$3nn$1@newton.pacific.net.sg> <37A02675.23233EB8@sni.de> <EF4B31908F2A7BAC.E7C81737A020640C.DF7A420979E4C82E@lp.airnews.net> <7nsoie$5g1$2@birch.prod.itd.earthlink.net> <7nt334$nfk$1@bgtnsc01.worldnet.att.net>

Show Full Headers

Complete Article Headers

X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 1144af,813a29bed80cb2f6
X-Google-Attributes: gid1144af,public
X-Google-Thread: 10e1c8,813a29bed80cb2f6
X-Google-Attributes: gid10e1c8,public
X-Google-Thread: f4d7c,813a29bed80cb2f6
X-Google-Attributes: gidf4d7c,public
From: hq@cheerful.com (Helen Quinn)
Subject: Re: RAID 1 or 5 ?
Date: 1999/07/31
Message-ID: <37ab7d33.12088492@news.seed.net.tw>
X-Deja-AN: 507220583
Content-Transfer-Encoding: 7bit
References: <7nl85m$3nn$1@newton.pacific.net.sg> <37A02675.23233EB8@sni.de> <EF4B31908F2A7BAC.E7C81737A020640C.DF7A420979E4C82E@lp.airnews.net> <7nsoie$5g1$2@birch.prod.itd.earthlink.net> <7nt334$nfk$1@bgtnsc01.worldnet.att.net>
Organization: SEEDNet News Service
Content-Type: text/plain; charset=us-ascii
Mime-Version: 1.0
Newsgroups: comp.arch.storage,comp.sys.ibm.pc.hardware.storage,fido.ger.storage

Reply to Parent Message