[lug] raid

j davis davis_compz at hotmail.com
Fri Oct 11 22:04:08 MDT 2002 

thanks for the input...i have rh7.3 now working with
a raid1 array with 2 spares. I used a hp netraid controller
on asus board.now i nfs mount my raided disk as my mail spool
and web root on my web server.

thanks
jd


>From: "D. Stimits" <stimits at attbi.com>
>Reply-To: lug at lug.boulder.co.us
>To: lug at lug.boulder.co.us
>Subject: Re: [lug] raid
>Date: Fri, 11 Oct 2002 15:33:39 -0600
>MIME-Version: 1.0
>Received: from community.tummy.com ([66.54.152.73]) by 
>mc6-f36.law1.hotmail.com with Microsoft SMTPSVC(5.0.2195.4905); Fri, 11 Oct 
>2002 14:34:21 -0700
>Received: (qmail 29159 invoked by uid 0); 11 Oct 2002 21:34:10 -0000
>Received: from localhost (HELO community.tummy.com) (127.0.0.1)  by 
>community.tummy.com with SMTP; 11 Oct 2002 21:34:03 -0000
>Received: (qmail 28986 invoked by alias); 11 Oct 2002 21:33:05 -0000
>Received: (qmail 28984 invoked by uid 0); 11 Oct 2002 21:33:05 -0000
>Received: from sccrmhc01.attbi.com (204.127.202.61)  by community.tummy.com 
>with SMTP; 11 Oct 2002 21:33:04 -0000
>Received: from attbi.com ([12.253.73.46]) by sccrmhc01.attbi.com          
>(InterMail vM.4.01.03.27 201-229-121-127-20010626) with ESMTP          id 
><20021011213304.NZEC28253.sccrmhc01.attbi.com at attbi.com>          for 
><lug at lug.boulder.co.us>; Fri, 11 Oct 2002 21:33:04 +0000
>Return-Path: <alias-blug_dom-lug-owner at lug.boulder.co.us>
>Delivered-To: mailman-lists.lug.boulder.co.us-lug at lists.lug.boulder.co.us
>Delivered-To: alias-blug_dom-lug at lug.boulder.co.us
>Message-ID: <3DA743B3.6020107 at attbi.com>
>User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0rc3) 
>Gecko/20020528
>X-Accept-Language: en-us, en
>References: <F116QYYAr27kicP3lh900000ee9 at hotmail.com>        
><3DA64603.9080804 at attbi.com> 
><45143.192.168.2.17.1034338019.squirrel at bilbo.hutnick.com>
>Sender: lug-admin at lug.boulder.co.us
>Errors-To: lug-admin at lug.boulder.co.us
>X-BeenThere: lug at lug.boulder.co.us
>X-Mailman-Version: 2.0.13
>Precedence: bulk
>X-Reply-To: stimits at attbi.com
>List-Help: <mailto:lug-request at lug.boulder.co.us?subject=help>
>List-Post: <mailto:lug at lug.boulder.co.us>
>List-Subscribe: 
><http://lists.lug.boulder.co.us/mailman/listinfo/lug>,<mailto:lug-request at lug.boulder.co.us?subject=subscribe>
>List-Id: Boulder (Colorado) Linux Users Group -- General Mailing List 
><lug.lug.boulder.co.us>
>List-Unsubscribe: 
><http://lists.lug.boulder.co.us/mailman/listinfo/lug>,<mailto:lug-request at lug.boulder.co.us?subject=unsubscribe>
>List-Archive: <http://lists.lug.boulder.co.us/pipermail/lug/>
>X-OriginalArrivalTime: 11 Oct 2002 21:34:21.0500 (UTC) 
>FILETIME=[F62837C0:01C2716D]
>
>Peter Hutnick wrote:
>>D. Stimits said:
>>
>>
>>>There is no technical reason to stop you, it'll work fine, but having
>>>slightly different specs can result in far less optimum throughput than
>>>with matched disks.
>>
>>
>>This is 100% correct.
>>
>>
>>>But for raid 5, those in series can be matched, and
>>>the one doing checksum would be nice as the 15krpm disk (till you lose a
>>>drive).
>>
>>
>>This is nonsense.  RAID 5 does not use an independent "checksum" (parity)
>>disk.  It alternates, like:
>
>Yes, I had been thinking of placing a pair of raid 0's in parallel, using 
>raid 1. But this is raid 1,0 (10), not raid 5, I spoke too soon, since the 
>two sets in raid 1 require matching sizes. Looks like he has the ability to 
>build the raid, but it will not be at its most efficient.
>
>D. Stimits, stimits AT attbi.com
>
>>
>>Disk1  Disk2  Disk3
>>data   data   parity
>>parity data   data
>>data   parity data
>>.. . .
>>
>>
>>>You could use the 10k for separate swap, plus other things,
>>>like  /tmp/, and gain other benefits. Raid 5 of course is not for
>>>performance  reasons anyway, it is for the case of disk failure, so you
>>>will probably  be reasonably happy with it.
>>
>>
>>This all makes sense, and is good advice if you use RAID-/4/, not 5.  See
>>http://www.tldp.org/HOWTO/Software-RAID-HOWTO-2.html.
>>
>>-Peter
>>
>>
>>_______________________________________________
>>Web Page:  http://lug.boulder.co.us
>>Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug
>>Join us on IRC: lug.boulder.co.us port=6667 channel=#colug
>>
>
>
>
>_______________________________________________
>Web Page:  http://lug.boulder.co.us
>Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug
>Join us on IRC: lug.boulder.co.us port=6667 channel=#colug


thanks,
jd

jd at taproot.bz           |  "MORE INPUT!"  |
http://www.taproot.bz   |    Johnny 5     |

_________________________________________________________________
MSN Photos is the easiest way to share and print your photos: 
http://photos.msn.com/support/worldwide.aspx

More information about the LUG mailing list