[Gluster-users] fuse vs libgfapi LIO performances comparison: how to make tests?
giacomelli.luca at gmail.com
Thu Mar 8 13:32:05 UTC 2018
Dear support, I need to export gluster volume with LIO for a
virtualization system. In this moment I have a very basic test
configuration: 2x HP 380 G7(2 * Intel X5670 (Six core @ 2,93GHz), 72GB
ram, hd RAID10 6xsas 10krpm, lan Intel X540 T2 10GB) directly
interconnected. Gluster configuration is replica 2. OS is Fedora 27
For my tests I used dd and I found strange results. Apparently the
volume mounted locally and exported with LIO is more faster than the
same volume exported directly with LIO.
For my tests I exported the volume from the first server and mounted and
checked the volume on the second
This is the dd command:
echo 3 > /proc/sys/vm/drop_caches
dd if=/dev/urandom of=file_1G bs=1M count=1000 oflag=direct
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 9.5597 s, 112 MB/s
direct with user:glfs
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 27.0812 s, 39.6 MB/s
I think there is something strange. I don't really know if dd is good in
order to obtain "good" numbers. I read that some people use iozone other
Fio or iometer...
Before ask information i'd like to be sure that the procedure and the
instrument used to check the configuration is correct.
I made also other tests and all suggest to me that the fuse way is
better than the other. Is it possible?
Any help would be appreciated.
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