From: Andy Smith <andy@lug.org.uk>
To: linux-raid <linux-raid@vger.kernel.org>
Subject: paralellism of device use in md
Date: Tue, 17 Jan 2006 12:09:27 +0000 [thread overview]
Message-ID: <20060117120927.GU7017@strugglers.net> (raw)
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I'm wondering: how well does md currently make use of the fact there
are multiple devices in the different (non-parity) RAID levels for
optimising reading and writing?
For example, are *writes* to a 2 device RAID-0 approaching twice as
fast as to a single device? If not, are they any faster at all?
Are reads from a 2 device RAID-1 twice as fast as from a single
device? If there are benefits, how quickly do they degrade to
nothing as disks are added?
What does the picture look like for reads and writes to a 4 device
RAID-10?
Sorry if my subject line isn't clear, but I coudn't think of a
better way to put it.
Thanks,
Andy
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next reply other threads:[~2006-01-17 12:09 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-17 12:09 Andy Smith [this message]
2006-01-17 23:04 ` paralellism of device use in md Neil Brown
2006-01-18 0:23 ` Tim Moore
2006-01-18 7:41 ` Mario 'BitKoenig' Holbe
2006-01-18 8:16 ` Mario 'BitKoenig' Holbe
2006-01-18 17:55 ` Francois Barre
2006-01-18 23:34 ` Neil Brown
2006-01-22 16:43 ` Tuomas Leikola
2006-01-19 11:30 ` Mario 'BitKoenig' Holbe
2006-01-18 9:50 ` Andy Smith
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