Hello,
To clearify:
* im testing with gluisterfs-2.0.0rc7
* all bricks are on same physical server(Xen guests). It's a testing
environment.
These are a few benchmarks I've done so far:
* time make-many-files #(this is slightly modified version that I've
found here:http://www.linuxinsight.com/files/make-many-files.c)
* time dd if=/dev/zero bs=8 count=128000 of=file1MB.bin
#(effectively creates lots of small consecutive fops)
* time dd if=/dev/zero bs=4096 count=25000 of=file100MB.bin
#(creates optimal transactions from HDDs physical point of view. I have
best results here with all configurations)
* time cp -a 0 1 2 /tmp #(/tmp is mounted as tmpfs; 0 1 2 are
directories created by "make-many-files" )
* time rm 0 1 2 -fr
I wish GlusterFS team provided simmilar set of tests so one can measure
his performance in a way that can be compared to results from others. I
think it would be a great value to all GlusterFS users and developers. I
think that to create basic set of these tests is a trivial task( maybe
just use mine :D ).
Below I attached my configuration. Without write-back translator I get
better results in most of the tests.
I can't understand why write-back has such a bad impact on
performance(being a performance *booster*).
I've also noticed that TCP packets are much lower than MTU in first
benchmark. Meaning write-back doesn't optimize writes.
Can you explain that?
Can someone help me to get high performance with AFR?
Regards,
Marko
#------------- configuration ---------------------
########## server ###########################
volume posix-brick
type storage/posix
option directory /srv/gluster
end-volume
volume lock-brick
type features/posix-locks
subvolumes posix-brick
option mandatory-locks on
end-volume
volume server
type protocol/server
option transport-type tcp/server
subvolumes lock-brick
option auth.addr.lock-brick.allow *
end-volume
########## client ###########################
volume brick1
type protocol/client
option transport-type tcp
option remote-host gluster-host1
option remote-subvolume lock-brick
end-volume
volume brick2
type protocol/client
option transport-type tcp
option remote-host gluster-host2
option remote-subvolume lock-brick
end-volume
volume AFR
type cluster/replicate
subvolumes brick1 brick2
end-volume
volume wb
type performance/write-behind
subvolumes AFR
option flush-behind on
option window-size 1MB
option aggregate-size 512KB
end-volume
