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I ran again my Lnet self test and this time adding
--concurrency=16 I can use all of the IB bandwith (3.5GB/sec).<br>
<br>
the only thing I do not understand is why ko2iblnd.conf is not
loaded properly and I had to remove the alias in the config file
to allow<br>
the proper peer_credit settings to be loaded.<br>
<br>
thanks to everyone for helping<br>
<br>
Riccardo<br>
<br>
On 8/19/17 8:54 AM, Riccardo Veraldi wrote:<br>
</div>
<blockquote
cite="mid:2f72090f-2e2e-af19-d3c4-eba790913d30@cnaf.infn.it"
type="cite">
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<div class="moz-cite-prefix"><br>
I found out that ko2iblnd is not getting settings from
/etc/modprobe/ko2iblnd.conf<br>
<tt>alias ko2iblnd-opa ko2iblnd</tt><tt><br>
</tt><tt>options ko2iblnd-opa peer_credits=128
peer_credits_hiw=64 credits=1024 concurrent_sends=256 ntx=2048
map_on_demand=32 fmr_pool_size=2048 fmr_flush_trigger=512
fmr_cache=1 conns_per_peer=4</tt><tt><br>
</tt><tt><br>
</tt><tt>install ko2iblnd /usr/sbin/ko2iblnd-probe</tt><tt><br>
</tt><br>
but if I modify ko2iblnd.conf like this, then settings are
loaded:<br>
<br>
<tt>options ko2iblnd peer_credits=128 peer_credits_hiw=64
credits=1024 concurrent_sends=256 ntx=2048 map_on_demand=32
fmr_pool_size=2048 fmr_flush_trigger=512 fmr_cache=1
conns_per_peer=4</tt><tt><br>
</tt><tt><br>
</tt><tt>install ko2iblnd /usr/sbin/ko2iblnd-probe</tt><br>
<br>
Lnet tests show better behaviour but still I Would expect more
than this.<br>
Is it possible to tune parameters in /etc/modprobe/ko2iblnd.conf
so that Mellanox ConnectX-3 will work more efficiently ?<br>
<br>
[LNet Rates of servers]<br>
[R] Avg: 2286 RPC/s Min: 0 RPC/s Max: 4572 RPC/s<br>
[W] Avg: 3322 RPC/s Min: 0 RPC/s Max: 6643 RPC/s<br>
[LNet Bandwidth of servers]<br>
[R] Avg: 625.23 MiB/s Min: 0.00 MiB/s Max: 1250.46 MiB/s
<br>
[W] Avg: 1035.85 MiB/s Min: 0.00 MiB/s Max: 2071.69 MiB/s
<br>
[LNet Rates of servers]<br>
[R] Avg: 2286 RPC/s Min: 1 RPC/s Max: 4571 RPC/s<br>
[W] Avg: 3321 RPC/s Min: 1 RPC/s Max: 6641 RPC/s<br>
[LNet Bandwidth of servers]<br>
[R] Avg: 625.55 MiB/s Min: 0.00 MiB/s Max: 1251.11 MiB/s
<br>
[W] Avg: 1035.05 MiB/s Min: 0.00 MiB/s Max: 2070.11 MiB/s
<br>
[LNet Rates of servers]<br>
[R] Avg: 2291 RPC/s Min: 0 RPC/s Max: 4581 RPC/s<br>
[W] Avg: 3329 RPC/s Min: 0 RPC/s Max: 6657 RPC/s<br>
[LNet Bandwidth of servers]<br>
[R] Avg: 626.55 MiB/s Min: 0.00 MiB/s Max: 1253.11 MiB/s
<br>
[W] Avg: 1038.05 MiB/s Min: 0.00 MiB/s Max: 2076.11 MiB/s
<br>
session is ended<br>
./lnet_test.sh: line 17: 23394 Terminated lst stat
servers<br>
<br>
<br>
<br>
<br>
On 8/19/17 4:20 AM, Arman Khalatyan wrote:<br>
</div>
<blockquote
cite="mid:CAAqDm6YrdsPzQ3=5LFgSBkSNgEdGLMtjhmD88tjw1cBsy2d7CA@mail.gmail.com"
type="cite">
<div dir="auto">just minor comment,
<div dir="auto">you should push up performance of your
nodes,they are not running in the max cpu frequencies.Al
tests might be inconsistent. in order to get most of ib run
following:</div>
<div dir="auto">tuned-adm profile latency-performance</div>
<div dir="auto">for more options use:</div>
<div dir="auto">tuned-adm list</div>
<div dir="auto"><br>
</div>
<div dir="auto">It will be interesting to see the difference.</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">Am 19.08.2017 3:57 vorm. schrieb
"Riccardo Veraldi" <<a moz-do-not-send="true"
href="mailto:Riccardo.Veraldi@cnaf.infn.it">Riccardo.Veraldi@cnaf.infn.it</a>>:<br
type="attribution">
<blockquote class="quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div class="m_-5514293233688902802moz-cite-prefix">Hello
Keith and Dennis, these are the test I ran.<br>
<br>
<ul>
<li>obdfilter-survey, shows that I Can saturate disk
performance, the NVMe/ZFS backend is performing
very well and it is faster then my Infiniband
network </li>
</ul>
<p><b><tt>pool alloc free read write
read write</tt></b><b><tt><br>
</tt></b><b><tt>------------ ----- ----- -----
----- ----- -----</tt></b><b><tt><br>
</tt></b><b><tt>drpffb-ost01 3.31T 3.19T 3
35.7K 16.0K 7.03G</tt></b><b><tt><br>
</tt></b><b><tt> raidz1 3.31T 3.19T 3
35.7K 16.0K 7.03G</tt></b><b><tt><br>
</tt></b><b><tt> nvme0n1 - - 1
5.95K 7.99K 1.17G</tt></b><b><tt><br>
</tt></b><b><tt> nvme1n1 - - 0
6.01K 0 1.18G</tt></b><b><tt><br>
</tt></b><b><tt> nvme2n1 - - 0
5.93K 0 1.17G</tt></b><b><tt><br>
</tt></b><b><tt> nvme3n1 - - 0
5.88K 0 1.16G</tt></b><b><tt><br>
</tt></b><b><tt> nvme4n1 - - 1
5.95K 7.99K 1.17G</tt></b><b><tt><br>
</tt></b><b><tt> nvme5n1 - - 0
5.96K 0 1.17G</tt></b><b><tt><br>
</tt></b><b><tt>------------ ----- ----- -----
----- ----- -----</tt></b><br>
</p>
this are the tests results<br>
<br>
<tt>Fri Aug 18 16:54:48 PDT 2017 Obdfilter-survey for
case=disk from drp-tst-ffb01</tt><tt><br>
</tt><tt>ost 1 sz 10485760K rsz 1024K obj 1 thr
1 write<b> 7633.08 </b> SHORT rewrite
7558.78 SHORT read 3205.24 [3213.70,
3226.78] </tt><tt><br>
</tt><tt>ost 1 sz 10485760K rsz 1024K obj 1 thr
2 write<b> 7996.89 </b> SHORT rewrite
7903.42 SHORT read 5264.70
SHORT </tt><tt><br>
</tt><tt>ost 1 sz 10485760K rsz 1024K obj 2 thr
2 write <b>7718.94</b> SHORT rewrite
7977.84 SHORT read 5802.17
SHORT </tt><tt><br>
</tt><br>
<ul>
<li>Lnet self test, and here I see the problems. For
reference 172.21.52.[83,84] are the two OSSes
172.21.52.86 is the reader/writer. Here is the
script that I ran</li>
</ul>
<p><tt>#!/bin/bash</tt><tt><br>
</tt><tt>export LST_SESSION=$$</tt><tt><br>
</tt><tt>lst new_session read_write</tt><tt><br>
</tt><tt>lst add_group servers
172.21.52.[83,84]@o2ib5</tt><tt><br>
</tt><tt>lst add_group readers 172.21.52.86@o2ib5</tt><tt><br>
</tt><tt>lst add_group writers 172.21.52.86@o2ib5</tt><tt><br>
</tt><tt>lst add_batch bulk_rw</tt><tt><br>
</tt><tt>lst add_test --batch bulk_rw --from readers
--to servers \</tt><tt><br>
</tt><tt>brw read check=simple size=1M</tt><tt><br>
</tt><tt>lst add_test --batch bulk_rw --from writers
--to servers \</tt><tt><br>
</tt><tt>brw write check=full size=1M</tt><tt><br>
</tt><tt># start running</tt><tt><br>
</tt><tt>lst run bulk_rw</tt><tt><br>
</tt><tt># display server stats for 30 seconds</tt><tt><br>
</tt><tt>lst stat servers & sleep 30; kill $!</tt><tt><br>
</tt><tt># tear down</tt><tt><br>
</tt><tt>lst end_session</tt><br>
</p>
<p><br>
</p>
<p>here the results<br>
</p>
<p><tt>SESSION: read_write FEATURES: 1 TIMEOUT: 300
FORCE: No</tt><tt><br>
</tt><tt>172.21.52.[83,84]@o2ib5 are added to
session</tt><tt><br>
</tt><tt>172.21.52.86@o2ib5 are added to session</tt><tt><br>
</tt><tt>172.21.52.86@o2ib5 are added to session</tt><tt><br>
</tt><tt>Test was added successfully</tt><tt><br>
</tt><tt>Test was added successfully</tt><tt><br>
</tt><tt>bulk_rw is running now</tt><tt><br>
</tt><tt>[LNet Rates of servers]</tt><tt><br>
</tt><tt>[R] Avg: 1751 RPC/s Min: 0 RPC/s
Max: 3502 RPC/s</tt><tt><br>
</tt><tt>[W] Avg: 2525 RPC/s Min: 0 RPC/s
Max: 5050 RPC/s</tt><tt><br>
</tt><tt>[LNet Bandwidth of servers]</tt><tt><br>
</tt><tt>[R] Avg: 488.79 MiB/s Min: 0.00 MiB/s
Max: 977.59 MiB/s </tt><tt><br>
</tt><tt>[W] Avg: 773.99 MiB/s Min: 0.00 MiB/s
Max: 1547.99 MiB/s </tt><tt><br>
</tt><tt>[LNet Rates of servers]</tt><tt><br>
</tt><tt>[R] Avg: 1718 RPC/s Min: 0 RPC/s
Max: 3435 RPC/s</tt><tt><br>
</tt><tt>[W] Avg: 2479 RPC/s Min: 0 RPC/s
Max: 4958 RPC/s</tt><tt><br>
</tt><tt>[LNet Bandwidth of servers]</tt><tt><br>
</tt><tt>[R] Avg: 478.19 MiB/s Min: 0.00 MiB/s
Max: 956.39 MiB/s </tt><tt><br>
</tt><tt>[W] Avg: 761.74 MiB/s Min: 0.00 MiB/s
Max: 1523.47 MiB/s </tt><tt><br>
</tt><tt>[LNet Rates of servers]</tt><tt><br>
</tt><tt>[R] Avg: 1734 RPC/s Min: 0 RPC/s
Max: 3467 RPC/s</tt><tt><br>
</tt><tt>[W] Avg: 2506 RPC/s Min: 0 RPC/s
Max: 5012 RPC/s</tt><tt><br>
</tt><tt>[LNet Bandwidth of servers]</tt><tt><br>
</tt><tt>[R] Avg: 480.79 MiB/s Min: 0.00 MiB/s
Max: 961.58 MiB/s </tt><tt><br>
</tt><tt>[W] Avg: 772.49 MiB/s Min: 0.00 MiB/s
Max: 1544.98 MiB/s </tt><tt><br>
</tt><tt>[LNet Rates of servers]</tt><tt><br>
</tt><tt>[R] Avg: 1722 RPC/s Min: 0 RPC/s
Max: 3444 RPC/s</tt><tt><br>
</tt><tt>[W] Avg: 2486 RPC/s Min: 0 RPC/s
Max: 4972 RPC/s</tt><tt><br>
</tt><tt>[LNet Bandwidth of servers]</tt><tt><br>
</tt><tt>[R] Avg: 479.09 MiB/s Min: 0.00 MiB/s
Max: 958.18 MiB/s </tt><tt><br>
</tt><tt>[W] Avg: 764.19 MiB/s Min: 0.00 MiB/s
Max: 1528.38 MiB/s </tt><tt><br>
</tt><tt>[LNet Rates of servers]</tt><tt><br>
</tt><tt>[R] Avg: 1741 RPC/s Min: 0 RPC/s
Max: 3482 RPC/s</tt><tt><br>
</tt><tt>[W] Avg: 2513 RPC/s Min: 0 RPC/s
Max: 5025 RPC/s</tt><tt><br>
</tt><tt>[LNet Bandwidth of servers]</tt><tt><br>
</tt><tt>[R] Avg: 484.59 MiB/s Min: 0.00 MiB/s
Max: 969.19 MiB/s </tt><tt><br>
</tt><tt>[W] Avg: 771.94 MiB/s Min: 0.00 MiB/s
Max: 1543.87 MiB/s </tt><tt><br>
</tt><tt>session is ended</tt><tt><br>
</tt><tt>./lnet_test.sh: line 17: 4940
Terminated lst stat servers</tt><tt><br>
</tt><br>
</p>
so looks like Lnet is really under performing going
at least half and less than InfiniBand capabilities.<br>
How can I find out what is causing this ?
<p>running perf tools tests with infiniband tools I
have good results:</p>
<p><tt><br>
</tt></p>
<p><tt>******************************<wbr>******</tt><tt><br>
</tt><tt>* Waiting for client to connect... *</tt><tt><br>
</tt><tt>******************************<wbr>******</tt><tt><br>
</tt><tt><br>
</tt><tt>------------------------------<wbr>------------------------------<wbr>---------------------------</tt><tt><br>
</tt><tt> Send BW Test</tt><tt><br>
</tt><tt> Dual-port : OFF
Device : mlx4_0</tt><tt><br>
</tt><tt> Number of qps : 1 Transport type
: IB</tt><tt><br>
</tt><tt> Connection type : RC Using SRQ
: OFF</tt><tt><br>
</tt><tt> RX depth : 512</tt><tt><br>
</tt><tt> CQ Moderation : 100</tt><tt><br>
</tt><tt> Mtu : 2048[B]</tt><tt><br>
</tt><tt> Link type : IB</tt><tt><br>
</tt><tt> Max inline data : 0[B]</tt><tt><br>
</tt><tt> rdma_cm QPs : OFF</tt><tt><br>
</tt><tt> Data ex. method : Ethernet</tt><tt><br>
</tt><tt>------------------------------<wbr>------------------------------<wbr>---------------------------</tt><tt><br>
</tt><tt> local address: LID 0x07 QPN 0x020f PSN
0xacc37a</tt><tt><br>
</tt><tt> remote address: LID 0x0a QPN 0x020f PSN
0x91a069</tt><tt><br>
</tt><tt>------------------------------<wbr>------------------------------<wbr>---------------------------</tt><tt><br>
</tt><tt> #bytes #iterations BW
peak[MB/sec] BW average[MB/sec] MsgRate[Mpps]</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1249.234000 != 1326.000000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 2 1000
0.00 11.99 6.285330</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1314.910000 != 1395.460000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 4 1000
0.00 28.26 7.409324</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1314.910000 != 1460.207000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 8 1000
0.00 54.47 7.139164</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1314.910000 != 1244.320000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 16 1000
0.00 113.13 7.413889</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1314.910000 != 1460.207000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 32 1000
0.00 226.07 7.407811</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1469.703000 != 1301.031000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 64 1000
0.00 452.12 7.407465</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1469.703000 != 1301.031000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 128 1000
0.00 845.45 6.925918</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1469.703000 != 1362.257000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 256 1000
0.00 1746.93 7.155406</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1469.703000 != 1362.257000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 512 1000
0.00 2766.93 5.666682</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1296.714000 != 1204.675000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 1024 1000
0.00 3516.26 3.600646</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1296.714000 != 1325.535000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 2048 1000
0.00 3630.93 1.859035</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1296.714000 != 1331.312000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 4096 1000
0.00 3702.39 0.947813</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1296.714000 != 1200.027000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 8192 1000
0.00 3724.82 0.476777</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1384.902000 != 1314.113000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 16384 1000
0.00 3731.21 0.238798</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1578.078000 != 1200.027000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 32768 1000
0.00 3735.32 0.119530</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1578.078000 != 1200.027000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 65536 1000
0.00 3736.98 0.059792</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1578.078000 != 1200.027000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 131072 1000
0.00 3737.80 0.029902</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1578.078000 != 1200.027000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 262144 1000
0.00 3738.43 0.014954</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1570.507000 != 1200.027000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 524288 1000
0.00 3738.50 0.007477</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1457.019000 != 1236.152000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 1048576 1000
0.00 3738.65 0.003739</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1411.597000 != 1234.957000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 2097152 1000
0.00 3738.65 0.001869</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1369.828000 != 1516.851000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 4194304 1000
0.00 3738.80 0.000935</tt><tt><br>
</tt><tt>Conflicting CPU frequency values detected:
1564.664000 != 1247.574000. CPU Frequency is not
max.</tt><tt><br>
</tt><tt> 8388608 1000
0.00 3738.76 0.000467</tt><tt><br>
</tt><tt>------------------------------<wbr>------------------------------<wbr>---------------------------</tt><tt><br>
</tt><tt><br>
</tt></p>
<p><tt>RDMA modules are loaded</tt><tt><br>
</tt><tt><br>
</tt><tt>rpcrdma 90366 0 </tt><tt><br>
</tt><tt>rdma_ucm 26837 0 </tt><tt><br>
</tt><tt>ib_uverbs 51854 2
ib_ucm,rdma_ucm</tt><tt><br>
</tt><tt>rdma_cm 53755 5
rpcrdma,ko2iblnd,ib_iser,rdma_<wbr>ucm,ib_isert</tt><tt><br>
</tt><tt>ib_cm 47149 5
rdma_cm,ib_srp,ib_ucm,ib_srpt,<wbr>ib_ipoib</tt><tt><br>
</tt><tt>iw_cm 46022 1 rdma_cm</tt><tt><br>
</tt><tt>ib_core 210381 15
rdma_cm,ib_cm,iw_cm,rpcrdma,<wbr>ko2iblnd,mlx4_ib,ib_srp,ib_<wbr>ucm,ib_iser,ib_srpt,ib_umad,<wbr>ib_uverbs,rdma_ucm,ib_ipoib,<wbr>ib_isert</tt><tt><br>
</tt><tt>sunrpc 334343 17
nfs,nfsd,rpcsec_gss_krb5,auth_<wbr>rpcgss,lockd,nfsv4,rpcrdma,<wbr>nfs_acl</tt><tt><br>
</tt></p>
<p>I do not know where to look to have Lnet performing
faster. I am running my ib0 interface in connected
mode with 65520 MTU size.</p>
<p>Any hint will be much appreciated</p>
<p>thank you</p>
<p>Rick</p>
<div class="quoted-text">
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
On 8/18/17 9:05 AM, Mannthey, Keith wrote:<br>
</div>
</div>
<div class="elided-text">
<blockquote type="cite">
<pre>I would suggest you a few other tests to help isolate where the issue might be.
1. What is the single thread "DD" write speed?
2. Lnet_selfttest: Please see " Chapter 28. Testing Lustre Network Performance (LNet Self-Test)" in the Lustre manual if this is a new test for you.
This will help show how much Lnet bandwith you have from your single client. There are tunable in the lnet later that can affect things. Which QRD HCA are you using?
3. OBDFilter_survey : Please see " 29.3. Testing OST Performance (obdfilter-survey)" in the Lustre manual. This test will help demonstrate what the backed NVMe/ZFS setup can do at the OBD layer in Lustre.
Thanks,
Keith
-----Original Message-----
From: lustre-discuss [<a moz-do-not-send="true" class="m_-5514293233688902802moz-txt-link-freetext" href="mailto:lustre-discuss-bounces@lists.lustre.org" target="_blank">mailto:lustre-discuss-<wbr>bounces@lists.lustre.org</a>] On Behalf Of Riccardo Veraldi
Sent: Thursday, August 17, 2017 10:48 PM
To: Dennis Nelson <a moz-do-not-send="true" class="m_-5514293233688902802moz-txt-link-rfc2396E" href="mailto:dnelson@ddn.com" target="_blank"><dnelson@ddn.com></a>; <a moz-do-not-send="true" class="m_-5514293233688902802moz-txt-link-abbreviated" href="mailto:lustre-discuss@lists.lustre.org" target="_blank">lustre-discuss@lists.lustre.<wbr>org</a>
Subject: Re: [lustre-discuss] Lustre poor performance
this is my lustre.conf
[drp-tst-ffb01:~]$ cat /etc/modprobe.d/lustre.conf options lnet networks=o2ib5(ib0),tcp5(<wbr>enp1s0f0)
data transfer is over infiniband
ib0: flags=4163<UP,BROADCAST,<wbr>RUNNING,MULTICAST> mtu 65520
inet 172.21.52.83 netmask 255.255.252.0 broadcast 172.21.55.255
On 8/17/17 10:45 PM, Riccardo Veraldi wrote:
</pre>
<blockquote type="cite">
<pre>On 8/17/17 9:22 PM, Dennis Nelson wrote:
</pre>
<blockquote type="cite">
<pre>It appears that you are running iozone on a single client? What kind of network is tcp5? Have you looked at the network to make sure it is not the bottleneck?
</pre>
</blockquote>
<pre>yes the data transfer is on ib0 interface and I did a memory to memory
test through InfiniBand QDR resulting in 3.7GB/sec.
tcp is used to connect to the MDS. It is tcp5 to differentiate it from
my other many Lustre clusters. I could have called it tcp but it does
not make any difference performance wise.
I ran the test from one single node yes, I ran the same test also
locally on a zpool identical to the one on the Lustre OSS.
Ihave 4 identical servers each of them with the aame nvme disks:
server1: OSS - OST1 Lustre/ZFS raidz1
server2: OSS - OST2 Lustre/ZFS raidz1
server3: local ZFS raidz1
server4: Lustre client
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