[Lustre-discuss] Same performance Infiniband and Ethernet

[Vsevolod Nikonorov]

What disks do your OSTs have? Maybe you have reached your disk 
performance limit, so Infiniband gives some speedup, but very small. Did 
you try to enable striping on your Lustre filesystem? For instance, you 
can type something like this: "lfs setstripe -c <count of stripes> 
/mnt/lustre/somefolder" and than copy a file into that folder.

Also, there's an opinion that sequence of zeros is not a good way to 
test a performance, so maybe you should try using /dev/urandom (which is 
rather slow, so it's better to have a pre-generated "urandom" file in 
/ram, or /dev/shm, or where your memory space is mounted to, and copy 
that file to Lustre filesystem as a test).



Pardo Diaz, Alfonso писал 2014-05-19 14:33:
> Hi,
> 
> I have migrated my Lustre 2.2 to 2.5.1 and I have equipped my OSS/MDS
> and clients with Infiniband QDR interfaces.
> I have compile lustre with OFED 3.2 and I have configured lnet module 
> with:
> 
> options lent networks=“o2ib(ib0),tcp(eth0)”
> 
> 
> But when I try to compare the lustre performance across Infiniband
> (o2ib), I get the same performance than across ethernet (tcp):
> 
> INFINIBAND TEST:
> dd if=/dev/zero of=test.dat bs=1M count=1000
> 1000+0 records in
> 1000+0 records out
> 1048576000 bytes (1,0 GB) copied, 5,88433 s, 178 MB/s
> 
> ETHERNET TEST:
> dd if=/dev/zero of=test.dat bs=1M count=1000
> 1000+0 records in
> 1000+0 records out
> 1048576000 bytes (1,0 GB) copied, 5,97423 s, 154 MB/s
> 
> 
> And this is my scenario:
> 
> - 1 MDs with SSD RAID10 MDT
> - 10 OSS with 2 OST per OSS
> - Infiniband interface in connected mode
> - Centos 6.5
> - Lustre 2.5.1
> - Striped filesystem “lfs setstripe -s 1M -c 10"
> 
> 
> I know my infiniband running correctly, because if I use IPERF3
> between client and servers I got 40Gb/s by infiniband and 1Gb/s by
> ethernet connections.
> 
> 
> 
> Could you help me?
> 

> 
> Regards,
> 
> 
> 
> 
> 
> Alfonso Pardo Diaz
> System Administrator / Researcher
> c/ Sola nº 1; 10200 Trujillo, ESPAÑA
> Tel: +34 927 65 93 17 Fax: +34 927 32 32 37
> 
> 
> 
> 
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Никоноров Всеволод Дмитриевич, ОИТТиС, НИКИЭТ

Vsevolod D. Nikonorov, JSC NIKET

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