 | | | NFS vs. md raid | NFS vs. md raid 2006-06-08 - By Christopher McCrory
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Hello...
speaking of NFS...
I've continually had slow write performance ( specifically file
creation) with RHEL3 when the NFS server filesystem is a software raid
device. THe same thing happens with RHEL4. When using a single drive
as an export, performance is fast. So far the only option I have found
that helps is exporting with the 'async' option. All clients are also
RHEL
example:
time tar -xzf lots.of.files.tar.gz
local drive:
real 0m6.053s
user 0m2.210s
sys 0m1.180s
nfs with async (insane)
real 0m6.492s
user 0m2.150s
sys 0m1.140s
nfs with sync (sane)
real 1m52.756s
user 0m2.430s
sys 0m1.290s
6 seconds vs. 120 seconds. Ouch
Any ideas?
--
Christopher McCrory
"The guy that keeps the servers running"
chrismcc@(protected)
http://www.pricegrabber.com
Let's face it, there's no Hollow Earth, no robots, and
no 'mute rays.' And even if there were, waxed paper is
no defense. I tried it. Only tinfoil works.
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