From: Nicholas Leippe <nick@byu.edu>
To: linux-raid@vger.kernel.org
Subject: smart raid1 reads?
Date: Thu, 19 Jun 2003 19:14:52 -0600 [thread overview]
Message-ID: <200306191914.52921.nick@byu.edu> (raw)
Hi,
I searched the archives, and the last time this was mentioned was in 2001, and
no response was ever given.
In a raid0, of course, reads pull off every disk in parallel, thus performance
scales with # of disks.
However, with raid1, it does not do this--it always reads from just one half
of the mirror. Why doesn't it read from both halves of the mirror in
parallel? I would expect it to, and would expect raid1 to perform similar to
raid0 for reads.
I have observed this with 2.4.18 and 2.4.20 thru at least 21rc2.
Nick
please cc
next reply other threads:[~2003-06-20 1:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-20 1:14 Nicholas Leippe [this message]
2003-06-20 3:56 ` Why I couldn't turn the DMA mode on ? bmoon
-- strict thread matches above, loose matches on Subject: below --
2003-08-11 12:32 smart raid1 reads? Michael T. Babcock
[not found] ` <200308111119.32344.nick@byu.edu>
2003-08-11 18:27 ` Michael T. Babcock
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