Date: Sat, 22 Nov 2008 03:33:13 +0300 From: "Joseph Yeager" <joeyea323@gmail.com> To: freebsd-geom@freebsd.org Subject: GGatec Performance Message-ID: <44f12db00811211633w52c7b600s20e13f4255a82948@mail.gmail.com>
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I've been messing around ggatec lately and have noticed that I see a
drastic decrease in write speed when I share out devices as opposed to
files. For instance, lets say Server2 is trying to share a drive to
Server1. Server2 has 2 partitions, one for the OS and the other for the
share. If I do a newfs on the 2nd partition, mount it, and create a large
file on the mount I can expect a slowdown of about 5-10MB/s compared to
native speed (the drive writes at about 50-55MB/s natively) when writing
over the network. If I were to, instead, do the same as above except dont
bother mounting and creating a large file and just sharing out the device I
see a major slowdown. Where I can easily get 40-50MB/s with the former
method, the latter method has trouble hitting 15MB/s. Sometimes it will
barely hit 5MB/s! I see two possible solutions here that I hope someone can
help me with:
1. Perhaps there are some performance tuning steps I can do to
alleviate this problem or perhaps this is the incorrect way to share it out.
2. Is there any way to quickly create large files? I do like this
approach better as this gives me a better way to subdivide the share. The
only problem is that even at over 50MB/s, dd will still take a very long
time to create a 500GB file.
Thanks for your help,
Joe
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