windows software raid 0 volume extremely slow
From: George W. Bush (GeorgeWBush_at_discussions.microsoft.com)
Date: 11/29/04
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Date: Sun, 28 Nov 2004 16:15:04 -0800
i have two identical 120 Gb HDDs. each is connected as master to a separate
ide channel. among other ide devices is only a cd rom drive connected as
slave to secondary channel. but i almost never actually use it so it shouldnt
be affecting the issue with the HDDs.
both of them are set up as dynamic disks. each has a simple volume on it and
a 100Gb chunk that is a part of a striped volume set up across these two
disks (using 1 such chunk on each of the drives). so far so good. this
configuration i suppose is acceptable according to windows help instructions.
right after installing windows i measured performance of all of the three
volumes. i used winbench99 and transfer speeds were pretty close to what one
would expect from such a seemingly nice configuration. simple volume showed
about 56MB/s which is just 2MB/s below technical specifications for this
model. striped volume showed 82 MB/s speed.
but here's what i get in real life from these disks. copying/moving from
simple to simple volume gives me speed of about 23MB/s which is far from 56
in the test but ok i can live with it. what's most outrageous is the speed of
the striped volume. all copying/moving operations involving this volume are
at speed of approximately 1.5MB/s. what kind of fast volume is it? in fact
its the bottleneck in my system right now- - i can't even watch a divx movie
from it without getting the slideshow effect if i simultaneously say copy
something onto this volume or process some file on it or do smth like that.
copying a 700Mb movie from/onto it takes up to 10 min. this IS ridiculous.
i have measured the performance of these disks again thru winbench right now
it still shows the same good speeds of 56 and 82 MB/s respectively. what is
it - windows using the available bandwidth incorrectly/ineffectively or what?
and it's not a problem of these specific drives. before them i had two other
drives and pretty much the same sort of configuration and had exactly the
same situation with them: perfect results in winbech (exactly up to
expectations) and on the other hand lousiest performance (1.5MB/s for raid 0)
with real tasks.
i really need to figure out what is wrong here cos i'm planning to upgrade
to 3x200Gb disks and right now i dont have the slightest inclination to use
the "magical" software raid 0 again.
system config: msi 6378 v.3 (via kle133 w/int. vga), athlon XP 2400+, 512
RAM, winxp
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