Unless you're using a caching filesystem like zfs, then you're going to be limited by how fast your storage back end can actually right to disk. Unless you have a quite large storage back end, 10gbe is probably faster than your disks can read and write.
On Sep 7, 2015 4:26 PM, Demeter Tibor <tdeme...@itsmart.hu> wrote: > > Hi All, > > I have to create a test environment for testing purposes, because we need to > testing our new 10gbe infrastructure. > One server that have a 10gbe nic - this is the vdsm host and ovirt portal. > One server that have a 10gbe nic - this is the storage. > > Its connected to each other throught a dlink 10gbe switch. > > Everything good and nice, the server can connect to storage, I can make and > run VMs, but the storage performance from inside VM seems to be 1Gb/sec only. > I did try the iperf command for testing connections beetwen servers, and it > was 9.40 GB/sec. I have try to use hdparm -tT /dev/mapper/iscsidevice and > also it was 400-450 MB/sec. I've got same result on storage server. > > So: > > - hdparm test on local storage ~ 400 mb/sec > - hdparm test on ovirt node server through attached iscsi device ~ 400 Mb/sec > - hdparm test from inside vm on local virtual disk - 93-102 Mb /sec > > The question is : Why? > > ps. I Have only one ovirtmgmt device, so there are no other networks. The > router is only 1gbe/sec, but i've tested and the traffic does not going > through this. > > Thanks in advance, > > Regards, > Tibor _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
