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@redhat.com>: On Sun, Nov 19, 2017 at 7:08 PM, Arman Khalatyan <arm2arm@gmail.com> 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@test.vm <root@gans.vm> ~]# 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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