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<div class="moz-cite-prefix">On 04/14/2017 12:20 PM, Pranith Kumar
Karampuri wrote:<br>
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<div class="gmail_quote">On Sat, Apr 8, 2017 at 10:28 AM,
Ravishankar N <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:ravishankar@redhat.com" target="_blank">ravishankar@redhat.com</a>></span>
wrote:<br>
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<div class="gmail-m_1278894059907384689moz-cite-prefix">Hi
Pat,<br>
<br>
I'm assuming you are using gluster native (fuse
mount). If it helps, you could try mounting it via
gluster NFS (gnfs) and then see if there is an
improvement in speed. Fuse mounts are slower than gnfs
mounts but you get the benefit of avoiding a single
point of failure. Unlike fuse mounts, if the gluster
node containing the gnfs server goes down, all mounts
done using that node will fail). For fuse mounts, you
could try tweaking the write-behind xlator settings to
see if it helps. See the performance.write-behind and
performance.write-behind-<wbr>window-size options in
`gluster volume set help`. Of course, even for gnfs
mounts, you can achieve fail-over by using CTDB.<br>
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<div>Ravi,<br>
</div>
<div> Do you have any data that suggests fuse mounts
are slower than gNFS servers? <br>
</div>
</div>
</div>
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I have heard anecdotal evidence time and again on the ML and IRC,
which is why I wanted to compare it with NFS numbers on his setup. <br>
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<div>Pat,<br>
</div>
<div> I see that I am late to the thread, but do you
happen to have "profile info" of the workload?<br>
<br>
</div>
<div>You can follow <a moz-do-not-send="true"
href="https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Monitoring%20Workload/">https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Monitoring%20Workload/</a>
to get the information.<br>
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Yeah, Let's see if profile info shows up anything interesting.<br>
-Ravi<br>
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<div> </div>
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<br>
Thanks,<br>
Ravi
<div>
<div class="gmail-h5"><br>
<br>
On 04/08/2017 12:07 AM, Pat Haley wrote:<br>
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<div class="gmail-h5"> <br>
Hi,<br>
<br>
We noticed a dramatic slowness when writing to a
gluster disk when compared to writing to an NFS
disk. Specifically when using dd (data duplicator)
to write a 4.3 GB file of zeros:<br>
<ul>
<li>on NFS disk (/home): 9.5 Gb/s</li>
<li>on gluster disk (/gdata): 508 Mb/s<br>
</li>
</ul>
The gluser disk is 2 bricks joined together, no
replication or anything else. The hardware is
(literally) the same:<br>
<ul>
<li>one server with 70 hard disks and a
hardware RAID card.</li>
<li>4 disks in a RAID-6 group (the NFS disk)</li>
<li>32 disks in a RAID-6 group (the max allowed
by the card, /mnt/brick1)</li>
<li>32 disks in another RAID-6 group
(/mnt/brick2)</li>
<li>2 hot spare<br>
</li>
</ul>
<p>Some additional information and more tests
results (after changing the log level):<br>
</p>
<p><span>glusterfs 3.7.11 built on Apr 27 2016
14:09:22</span><br>
<span>CentOS release 6.8 (Final)</span><br>
RAID bus controller: LSI Logic / Symbios Logic
MegaRAID SAS-3 3108 [Invader] (rev 02)<br>
<br>
<br>
<br>
<b>Create the file to /gdata (gluster)</b><br>
[root@mseas-data2 gdata]# dd if=/dev/zero
of=/gdata/zero1 bs=1M count=1000<br>
1000+0 records in<br>
1000+0 records out<br>
1048576000 bytes (1.0 GB) copied, 1.91876 s, <b>546
MB/s</b><br>
<br>
<b>Create the file to /home (ext4)</b><br>
[root@mseas-data2 gdata]# dd if=/dev/zero
of=/home/zero1 bs=1M count=1000<br>
1000+0 records in<br>
1000+0 records out<br>
1048576000 bytes (1.0 GB) copied, 0.686021 s, <b>1.5
GB/s - </b>3 times as fast<b><br>
<br>
<br>
Copy from /gdata to /gdata (gluster to
gluster)<br>
</b>[root@mseas-data2 gdata]# dd if=/gdata/zero1
of=/gdata/zero2<br>
2048000+0 records in<br>
2048000+0 records out<br>
1048576000 bytes (1.0 GB) copied, 101.052 s, <b>10.4
MB/s</b> - realllyyy slooowww<br>
<br>
<br>
<b>Copy from /gdata to /gdata</b> <b>2nd time <b>(gluster
to gluster)</b></b><br>
[root@mseas-data2 gdata]# dd if=/gdata/zero1
of=/gdata/zero2<br>
2048000+0 records in<br>
2048000+0 records out<br>
1048576000 bytes (1.0 GB) copied, 92.4904 s, <b>11.3
MB/s</b> <span>- realllyyy slooowww</span>
again<br>
<br>
<br>
<br>
<b>Copy from /home to /home (ext4 to ext4)</b><br>
[root@mseas-data2 gdata]# dd if=/home/zero1
of=/home/zero2<br>
2048000+0 records in<br>
2048000+0 records out<br>
1048576000 bytes (1.0 GB) copied, 3.53263 s, <b>297
MB/s </b>30 times as fast<br>
<br>
<br>
<b>Copy from /home to /home (ext4 to ext4)</b><br>
[root@mseas-data2 gdata]# dd if=/home/zero1
of=/home/zero3<br>
2048000+0 records in<br>
2048000+0 records out<br>
1048576000 bytes (1.0 GB) copied, 4.1737 s, <b>251
MB/s</b> <span>- 30 times as fast<br>
<br>
<br>
As a test, can we copy data directly to the
xfs mountpoint (/mnt/brick1) and bypass
gluster?<br>
<br>
<br>
Any help you could give us would be
appreciated.<br>
<br>
</span>Thanks<br>
</p>
<pre class="gmail-m_1278894059907384689moz-signature" cols="72">--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=<wbr>-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=<wbr>-=-=-
Pat Haley Email: <a moz-do-not-send="true" class="gmail-m_1278894059907384689moz-txt-link-abbreviated" href="mailto:phaley@mit.edu" target="_blank">phaley@mit.edu</a>
Center for Ocean Engineering Phone: (617) 253-6824
Dept. of Mechanical Engineering Fax: (617) 253-8125
MIT, Room 5-213 <a moz-do-not-send="true" class="gmail-m_1278894059907384689moz-txt-link-freetext" href="http://web.mit.edu/phaley/www/" target="_blank">http://web.mit.edu/phaley/www/</a>
77 Massachusetts Avenue
Cambridge, MA 02139-4301
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<div class="gmail_signature"><div dir="ltr">Pranith
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