<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 17, 2017 at 9:54 PM, Joe Julian <span dir="ltr"><<a href="mailto:joe@julianfamily.org" target="_blank">joe@julianfamily.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p>On 05/17/17 02:02, Pranith Kumar Karampuri wrote:</p>
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<div class="gmail_quote">On Tue, May 16, 2017 at 9:38 PM, Joe
Julian <span dir="ltr"><<a href="mailto:joe@julianfamily.org" target="_blank">joe@julianfamily.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"><span> On
04/13/17 23:50, Pranith Kumar Karampuri wrote:<br>
<blockquote type="cite">
<div dir="ltr"><br>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sat, Apr 8, 2017 at
10:28 AM, Ravishankar N <span dir="ltr"><<a href="mailto:ravishankar@redhat.com" target="_blank">ravishankar@redhat.com</a>></span>
wrote:<br>
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<div class="m_-875868466419156909m_4805976556227362749gmail-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-windo<wbr>w-size
options in `gluster volume set help`. Of
course, even for gnfs mounts, you can
achieve fail-over by using CTDB.<br>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>Ravi,<br>
</div>
<div> Do you have any data that suggests
fuse mounts are slower than gNFS servers? <br>
<br>
</div>
<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>
</div>
</div>
</blockquote>
<br>
</span> I have done actual testing. For directory ops,
NFS is faster due to the default cache settings in the
kernel. For raw throughput, or ops on an open file, fuse
is faster.<br>
<br>
I have yet to test this but I expect with the newer
caching features in 3.8+, even directory op performance
should be similar to nfs and more accurate.</div>
</blockquote>
<div><br>
</div>
<div>We are actually comparing fuse+gluster and kernel NFS
(n the same brick. Did you get a chance to do this test
at any point?<br>
</div>
</div>
</div>
</div>
</blockquote>
<br></span>
No, that's not comparing like to like and I've rarely had a use case
to which a single-store NFS was the answer.</div></blockquote><div><br></div><div>Exactly. Why is it so bad compared to kNFS? Is there any scope for improvement is the question we are trying to find answer to. If there is everyone wins :-)<br><br></div><div>PS: I may not respond till tomorrow. Will go to sleep now.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000"><div><div class="h5"><br>
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<div> </div>
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<div class="m_-875868466419156909h5"><br>
<br>
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<div class="gmail_extra">
<div class="gmail_quote">
<div>You can follow <a href="https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Monitoring%20Workload/" target="_blank">https://gluster.readthedocs.io<wbr>/en/latest/Administrator%20Gui<wbr>de/Monitoring%20Workload/</a>
to get the information.<br>
</div>
<div> </div>
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<br>
Thanks,<br>
Ravi
<div>
<div class="m_-875868466419156909m_4805976556227362749gmail-h5"><br>
<br>
On 04/08/2017 12:07 AM, Pat Haley
wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div class="m_-875868466419156909m_4805976556227362749gmail-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="m_-875868466419156909m_4805976556227362749gmail-m_1278894059907384689moz-signature" cols="72">--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=<wbr>-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=<wbr>-=-=-
Pat Haley Email: <a class="m_-875868466419156909m_4805976556227362749gmail-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 class="m_-875868466419156909m_4805976556227362749gmail-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></div></div></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Pranith<br></div></div>
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