Re: [ovirt-users] Some tests results: lustrefs over nfs on VM
On Nov 19, 2017 11:05 PM, "Arman Khalatyan" <arm2arm@gmail.com> wrote: 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? Define QoS on the NIC. But I think you wish to limit IO, no? Y. 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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On Mon, Nov 20, 2017 at 12:23 PM, Yaniv Kaul <ykaul@redhat.com> wrote:
Define QoS on the NIC. But I think you wish to limit IO, no? Y.
For the moment QoS is unlimited. Actually for some tasks I wish to allocate 80% of 10Gbit interface, but the VM interface is always 1Gbit. Inside the QoS of the host interface I cannot put 8000 for the Rate Limit, it claims that rate limit should be between number 1...1024, looks like it assumes only 1Gbit interfaces? a.
On Mon, Nov 20, 2017 at 4:24 PM, Arman Khalatyan <arm2arm@gmail.com> wrote:
On Mon, Nov 20, 2017 at 12:23 PM, Yaniv Kaul <ykaul@redhat.com> wrote:
Define QoS on the NIC. But I think you wish to limit IO, no? Y.
For the moment QoS is unlimited. Actually for some tasks I wish to allocate 80% of 10Gbit interface, but the VM interface is always 1Gbit.
The VM interface is virtual. It's not limited or set to 1G. Due to some ancient Windows certification requirements (that required that an interface would have a defined speed!), 1G was set for it.
Inside the QoS of the host interface I cannot put 8000 for the Rate Limit, it claims that rate limit should be between number 1...1024, looks like it assumes only 1Gbit interfaces?
I kinda remember we had this issue in the past - and it was fixed - please file a bug so we'll look at it. Y.
a.
Ok, thanks, looks like a BUG, I will open one... On Tue, Nov 21, 2017 at 12:40 PM, Yaniv Kaul <ykaul@redhat.com> wrote:
On Mon, Nov 20, 2017 at 4:24 PM, Arman Khalatyan <arm2arm@gmail.com> wrote:
On Mon, Nov 20, 2017 at 12:23 PM, Yaniv Kaul <ykaul@redhat.com> wrote:
Define QoS on the NIC. But I think you wish to limit IO, no? Y.
For the moment QoS is unlimited. Actually for some tasks I wish to allocate 80% of 10Gbit interface, but the VM interface is always 1Gbit.
The VM interface is virtual. It's not limited or set to 1G. Due to some ancient Windows certification requirements (that required that an interface would have a defined speed!), 1G was set for it.
Inside the QoS of the host interface I cannot put 8000 for the Rate Limit, it claims that rate limit should be between number 1...1024, looks like it assumes only 1Gbit interfaces?
I kinda remember we had this issue in the past - and it was fixed - please file a bug so we'll look at it. Y.
a.
participants (2)
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Arman Khalatyan -
Yaniv Kaul