On 08/04/2015 05:53 PM, Shyam wrote:
On 08/04/2015 12:55 PM, Hafeez Bana wrote:
All,
We've been evaluating glusterfs 3.2.7 on ubuntu 14.04 LTS. All tests
were run with event-thread matching cpu-cores and lookup-unhashed
turned off
I think you are referring to lookup-optimize rather than
lookup-unhashed, please use lookup-optimize which is meant for the
small file performance improvement.
No, he means unhashed. lookup-optimize isn't in 3.2. One of his biggest
problems will be the lack of readdirp support.
We noted a couple of issues and some interesting results which might be
of benefit to the developers
Setup
- bare metal machine with SSD running ZFS - 2 LXC container running
glusterd and another running a samba instance which is serving a share
backed by a fuse mounted volume.
There are too many things in the stack here to reliably measure
performance is what I would think.
I would first, run atop the FUSE mount and compare results with 3.6.x
to see if the options provided improve the performance or not.
Observations
1 ) the fuse mounted volume has to be done in the host and LXC run on
top of it. If you try to fuse mount within in LXC - posix acls group
persmissions are not respected completed by gluster
2) small file performance - tests were run unzipping from a windows box
a 45M and 150M (expanded size - contains 8000 files) archive. 45M
performance is reasonable. 150M tests takes 10 times as long(about 18
minutes) as the same samba instance serving of a straight zfs filesystem
3) As a whim we logged into the container containing the samba instance
and copied files from the ZFS folder to the folder under gluster.
14seconds for the same transfer of 8000 files!!
We don't know if there is a mismatch in the config of samba that is
causing issues with gluster. Any ideas? And also is the issue with posix
acls groups being broken if you fuse_mount a gluster volume within LXC
known?
Finally, are there any gluster developers in the UK - we would love to
talk to them.
Thanks,
Hafeez
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