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<font size="-1">Hi, I'm newbie on lustre.<br>
<br>
</font><font size="-1">I am using Lustre-2.10.0. </font><font
size="-1">When I use ost-survey with default -s value, <br>
it works well. </font><font size="-1">But when I changes -s
value, it hangs at read step.</font><br>
<font size="-1">(see below)</font><br>
<br>
<font size="-1">ost-survey seems to change max_cached_mb to 256 *
system page size <br>
in MB which is 16 in our lustre environment.<br>
</font><br>
<font size="-1">I changed this value to a larger value and it works
well.<br>
<br>
I think minimum max_cached_mb value for ost-survey has something
wrong.<br>
<br>
Do you have any comments or something?<br>
<br>
BR,<br>
Jae-Hyuck<br>
<br>
[root@cn11 ~]# ost-survey /lustre<br>
/usr/bin/ost-survey: 11/24/17 OST speed survey on /lustre from
10.0.0.111@o2ib1<br>
Number of Active OST devices : 8<br>
Page Size is 4096<br>
write index 0 done.<br>
write index 1 done.<br>
write index 2 done.<br>
write index 3 done.<br>
write index 4 done.<br>
write index 5 done.<br>
write index 6 done.<br>
write index 7 done.<br>
read index 0 done.<br>
read index 1 done.<br>
read index 2 done.<br>
read index 3 done.<br>
read index 4 done.<br>
read index 5 done.<br>
read index 6 done.<br>
read index 7 done.<br>
Worst Read OST indx: 0 speed: 544.158868<br>
Best Read OST indx: 7 speed: 745.733589<br>
Read Average: 642.827346 +/- 63.038560 MB/s<br>
Worst Write OST indx: 2 speed: 165.359455<br>
Best Write OST indx: 0 speed: 547.385382<br>
Write Average: 284.413980 +/- 118.452906 MB/s<br>
Ost# Read(MB/s) Write(MB/s) Read-time Write-time<br>
----------------------------------------------------<br>
0 544.159 547.385 0.055 0.055<br>
1 597.003 245.347 0.050 0.122<br>
2 622.987 165.359 0.048 0.181<br>
3 648.340 172.648 0.046 0.174<br>
4 730.477 384.788 0.041 0.078<br>
5 607.521 218.656 0.049 0.137<br>
6 646.398 262.812 0.046 0.114<br>
7 745.734 278.317 0.040 0.108<br>
[root@cn11 ~]# ost-survey -s 10 /lustre<br>
/usr/bin/ost-survey: 11/24/17 OST speed survey on /lustre from
10.0.0.111@o2ib1<br>
Number of Active OST devices : 8<br>
Page Size is 4096<br>
write index 0 done.<br>
write index 1 done.<br>
write index 2 done.<br>
write index 3 done.<br>
write index 4 done.<br>
write index 5 done.<br>
write index 6 done.<br>
write index 7 done.<br>
read index 0 done.<br>
read index 1 done.<br>
read index 2 done.<br>
read index 3 done.<br>
read index 4 done.<br>
read index 5 done.<br>
read index 6 done.<br>
read index 7 done.<br>
Worst Read OST indx: 4 speed: 323.487301<br>
Best Read OST indx: 3 speed: 425.770117<br>
Read Average: 378.171698 +/- 32.609314 MB/s<br>
Worst Write OST indx: 5 speed: 142.140286<br>
Best Write OST indx: 0 speed: 361.154509<br>
Write Average: 248.073472 +/- 75.279234 MB/s<br>
Ost# Read(MB/s) Write(MB/s) Read-time Write-time<br>
----------------------------------------------------<br>
0 335.843 361.155 0.030 0.028<br>
1 386.369 244.261 0.026 0.041<br>
2 396.778 214.615 0.025 0.047<br>
3 425.770 158.509 0.023 0.063<br>
4 323.487 330.927 0.031 0.030<br>
5 364.589 142.140 0.027 0.070<br>
6 386.113 314.592 0.026 0.032<br>
7 406.425 218.388 0.025 0.046<br>
[root@cn11 ~]# ost-survey -s 100 /lustre<br>
/usr/bin/ost-survey: 11/24/17 OST speed survey on /lustre from
10.0.0.111@o2ib1<br>
Number of Active OST devices : 8<br>
Page Size is 4096<br>
write index 0 done.<br>
write index 1 done.<br>
write index 2 done.<br>
write index 3 done.<br>
write index 4 done.<br>
write index 5 done.<br>
write index 6 done.<br>
write index 7 done.<br>
(hang)<br>
<br>
</font>
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