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So I'm still trying to figure out this iops limiting for vm's and it
still doesn't seem to be doing much. I have dropped the limit to a
iop limit of 50 and the results were not much different then 1000 or
500 limits:<br>
<br>
<blockquote type="cite">
<pre>THETEST -> IOPS Transfer
4096 direct: 104210 427 MB/s
4096 dsync: 39 160 kB/s
4096 sync: 29 119 kB/s
4096 fdatasync: 56549 232 MB/s
65536 direct: 6309 414 MB/s
65536 dsync: 12 834 kB/s
65536 sync: 12 829 kB/s
65536 fdatasync: 3734 245 MB/s
1048576 direct: 403 424 MB/s
1048576 dsync: 9 10.3 MB/s
1048576 sync: 9 9.7 MB/s
1048576 fdatasync: 232 244 MB/s
Running IOPing I/O benchmark...
IOping -> IOPS Transfer
Direct Small IO
Direct Large IO
Serverbear IOping Tests IOPS Transfer
IOPing Default 96 0.4
IOPing seek rate: 136 0.5
IOPing sequential: 404 101.1
IOPing cached: 323257 1262.7</pre>
</blockquote>
<br>
It took 254m18.987s (according to "time ./script" to finish
running). I'm being asked by management on why iop numbers are not
changing when a vm is limited and I have no answers. Am I doing
something wrong? Shouldn't a iop limit of 50 be a drastically
different number then 500?<br>
<br>
<div class="moz-cite-prefix">On 01/22/2014 03:07 PM, Mark Johanson
wrote:<br>
</div>
<blockquote cite="mid:52E02500.4090202@a2hosting.com" type="cite">
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
I'm not sure if I am doing something wrong (which is very
possible) but I am not seeing any kind of significant change in
numbers when going from a iops unlimited setting on a vps to a
iops 500 limit on the same vps. The vm is set via:<br>
<br>
vzctl set 101 --iopslimit 1000 --save<br>
rebooted and cat'd the conf file does show that the 500 limit is
there:<br>
<br>
IOPSLIMIT="500"<br>
<br>
vzctl version 4.6.1<br>
2.6.32-042stab084.14 #1 SMP Mon Dec 16 18:16:56 MSK 2013 x86_64
x86_64 x86_64 GNU/Linux<br>
<br>
For example the following comes from a variety of tests running on
the disks:<br>
<br>
<u>Unlimited test</u><br>
<br>
Downloading FIO...<br>
Downloading IOPing...<br>
Downloading UnixBench...<br>
Creating a file to use.<br>
<br>
<pre>THETEST -> IOPS Transfer
4096 direct: 108881 446 MB/s
4096 dsync: 31 129 kB/s
4096 sync: 20 85.3 kB/s
4096 fdatasync: 56781 233 MB/s
65536 direct: 6235 409 MB/s
65536 dsync: 21 1.4 MB/s
65536 sync: 21 1.4 MB/s
65536 fdatasync: 3969 260 MB/s
1048576 direct: 414 435 MB/s
1048576 dsync: 15 16.1 MB/s
1048576 sync: 15 16.0 MB/s
1048576 fdatasync: 231 243 MB/s
Running IOPing I/O benchmark...
IOping -> IOPS Transfer
Direct Small IO
Direct Large IO
Serverbear IOping Tests IOPS Transfer
IOPing Default 93 0.4
IOPing seek rate: 192 0.7
IOPing sequential: 945 236.2
IOPing cached: 325603 1271.9
Time,Hostname,Comment,4096 direct-iops,4096 direct-rate,4096 direct-unit,4096 dsync-iops,4096 dsync-rate,4096 dsync-unit,4096 sync-iops,4096 sync-rate,4096 sync-unit,4096 fdatasync-iops,4096 fdatasync-rate,4096 fdatasync-unit,65536 direct-iops,65536 direct-rate,65536 direct-unit,65536 dsync-iops,65536 dsync-rate,65536 dsync-unit,65536 sync-iops,65536 sync-rate,65536 sync-unit,65536 fdatasync-iops,65536 fdatasync-rate,65536 fdatasync-unit,1048576 direct-iops,1048576 direct-rate,1048576 direct-unit,1048576 dsync-iops,1048576 dsync-rate,1048576 dsync-unit,1048576 sync-iops,1048576 sync-rate,1048576 sync-unit,1048576 fdatasync-iops,1048576 fdatasync-rate,1048576 fdatasync-unit,IOp 4k D-iops:IOp 4k D-megs,IOp 64k D-iops,IOp 64k D-megs,SB Default-iops,SB Default-megs,SB Seek rate-iops,SB Seek rate-megs,SB Sequential-iops,SB Sequential-megs,SB Cached-iops,SB Cached-megs,
1390349785,server.example.com,,108881,446,MB/s,31,129,kB/s,20,85.3,kB/s,56781,233,MB/s,6235,409,MB/s,21,1.4,MB/s,21,1.4,MB/s,3969,260,MB/s,414,435,MB/s,15,16.1,MB/s,15,16.0,MB/s,231,243,MB/s,,,,,93,0.4,192,0.7,945,236.2325603,1271.9,</pre>
<br>
<u>500 Limited Test</u><br>
<br>
<pre>THETEST -> IOPS Transfer
4096 direct: 95545 391 MB/s
4096 dsync: 40 164 kB/s
4096 sync: 39 163 kB/s
4096 fdatasync: 61423 252 MB/s
65536 direct: 6676 438 MB/s
65536 dsync: 40 2.7 MB/s
65536 sync: 40 2.6 MB/s
65536 fdatasync: 3852 252 MB/s
1048576 direct: 402 422 MB/s
1048576 dsync: 27 28.8 MB/s
1048576 sync: 27 28.5 MB/s
1048576 fdatasync: 238 250 MB/s
Running IOPing I/O benchmark...
IOping -> IOPS Transfer
Direct Small IO
Direct Large IO
Serverbear IOping Tests IOPS Transfer
IOPing Default 117 0.5
IOPing seek rate: 196 0.8
IOPing sequential: 805 201.2
IOPing cached: 325274 1270.6
Time,Hostname,Comment,4096 direct-iops,4096 direct-rate,4096 direct-unit,4096 dsync-iops,4096 dsync-rate,4096 dsync-unit,4096 sync-iops,4096 sync-rate,4096 sync-unit,4096 fdatasync-iops,4096 fdatasync-rate,4096 fdatasync-unit,65536 direct-iops,65536 direct-rate,65536 direct-unit,65536 dsync-iops,65536 dsync-rate,65536 dsync-unit,65536 sync-iops,65536 sync-rate,65536 sync-unit,65536 fdatasync-iops,65536 fdatasync-rate,65536 fdatasync-unit,1048576 direct-iops,1048576 direct-rate,1048576 direct-unit,1048576 dsync-iops,1048576 dsync-rate,1048576 dsync-unit,1048576 sync-iops,1048576 sync-rate,1048576 sync-unit,1048576 fdatasync-iops,1048576 fdatasync-rate,1048576 fdatasync-unit,IOp 4k D-iops:IOp 4k D-megs,IOp 64k D-iops,IOp 64k D-megs,SB Default-iops,SB Default-megs,SB Seek rate-iops,SB Seek rate-megs,SB Sequential-iops,SB Sequential-megs,SB Cached-iops,SB Cached-megs,
1390359348,server.example.com,,95545,391,MB/s,40,164,kB/s,39,163,kB/s,61423,252,MB/s,6676,438,MB/s,40,2.7,MB/s,40,2.6,MB/s,3852,252,MB/s,402,422,MB/s,27,28.8,MB/s,27,28.5,MB/s,238,250,MB/s,,,,,117,0.5,196,0.8,805,201.2325274,1270.6,
</pre>
Does there need to be a specific setting enabled on the node,
specific type of scheduler, etc that is not being set and why I am
not seeing any significant changes? Any help would be great.<br>
</blockquote>
<br>
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