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From: "3tcdgwg3" <3tcdgwg3@prodigy.net>
Cc: 'Linux raid mailing list' <linux-raid@vger.kernel.org>,
	Paul Clements <Paul.Clements@SteelEye.com>
Subject: Software RAID level performance
Date: Thu, 6 Nov 2003 23:29:39 -0800	[thread overview]
Message-ID: <001d01c3a500$e99bf100$bb601e43@neptune> (raw)
In-Reply-To: 3ED7BF97.BAB11B12@SteelEye.com

Hello,

I have a question regarding the RAID1 performance.

I tought the RAID1 will access disk in a con-current way, but
today I installed a 2.4-18 (Redhat 9.0). Seems RAID1 code
is not doing the disk access in a balanced way? I see single disk
is faster the RAID1.  
First,  do dd, read from /dev/zero write to disk, 
then  dd again,  read from disk write write to /dev/null,
in both cases, single disk out run 2 disk RAID1.

Any one can help me to understand this?

Thank you so much.


  parent reply	other threads:[~2003-11-07  7:29 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-05-30 18:28 Software RAID level 1 issue Brian Schwarz
2003-05-30 18:40 ` Robert L. Harris
2003-05-31 17:44 ` Stef Telford
2003-05-30 20:01   ` Paul Clements
2003-05-30 20:12     ` 3tcdgwg3
2003-05-30 20:31       ` Paul Clements
2003-06-02 18:10         ` 3tcdgwg3
2003-06-02 18:16           ` Paul Clements
2003-11-07  7:29         ` 3tcdgwg3 [this message]
2003-05-31 19:39     ` Stef Telford
2003-05-30 21:44       ` Robert L. Harris
2003-05-30 22:04         ` Paul Clements
2003-05-30 23:32           ` Robert L. Harris
2003-05-31 20:21   ` Gregory Leblanc

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