Re: [ovirt-users] Some tests results: lustrefs over nfs on VM

Sunday, 19 November 2017

hi Yaniv,
yes for sure I hit some cache in between but not the vm cache, it has a 4GB
ram, with oflag=direct I get about 120MB/s

for the data analysis the cache is our friend:)

The backend is a lustrefs 2.10.x.
yes we have dedicated 10G on the hosts, where we can limit the vm interface
to 10Gbit?

Am 19.11.2017 8:33 nachm. schrieb "Yaniv Kaul" <ykaul(a)redhat.com&gt;:

On Sun, Nov 19, 2017 at 7:08 PM, Arman Khalatyan <arm2arm(a)gmail.com&gt; wrote:

...
 Hi, in our environment we got pretty good io performance on VM, with
 following configuration:
 lustrebox: /lust mounted on "GATEWAY" over IB
 GATEWAY: export /lust as nfs4 on 10G interface
 VM(test.vm): import as NFS over 10G interface

 [root(a)test.vm <root(a)gans.vm&gt; ~]# dd  if=/dev/zero bs=128K count=100000

Without oflag=direct, you are hitting (somewhat) the cache.

...

 of=/test/tmp/test.tmp
 100000+0 records in
 100000+0 records out
 13107200000 <(310)%20720-0000> bytes (13 GB) copied, 20.8402 s, 629 MB/s
 looks promising for the future deployments.

Very - what's the backend storage?

...

 only one problem remains that on heavy io I get some wornings that the vm
 network is saturated, are there way to configure the bandwidth limits to
 10G for the VM Interface??

Yes, but you really need a dedicated storage interface, no?
Y.

...

 thank you beforehand,
 Arman.

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