On 8 Sep 2015, at 07:45, Karli Sjöberg wrote: > tis 2015-09-08 klockan 06:59 +0200 skrev Demeter Tibor: >> Hi, >> Thank you for your reply. >> I'm sorry but I don't think so. This storage is fast, because it is a SSD >> based storage, and I can read/write to it with fast performance. >> I know, in virtual environment the I/O always slowest than on physical, but >> here I have a very large difference. >> Also, I use ext4 FS. > > My suggestion would be to use a filesystem benchmarking tool like bonnie > ++ to first test the performance locally on the storage server and then > redo the same test inside of a virtual machine. Also make sure the VM is > using VirtIO disk (either block or SCSI) for best performance. I have
also note new 3.6 support for virtio-blk dataplane[1]. Not sure how will it look using artificial stress tools, but in general it improves storage performance a lot. Thanks, michal [1] https://bugzilla.redhat.com/show_bug.cgi?id=1214311 > tested speeds over 1Gb/s with bonded 1Gb NICS so I know it should work > in theory as well as practice. > > Oh, and for the record. IO doesn´t have to be bound by the speed of > storage, if the host caches in RAM before sending it over the wire. But > that in my opinion is dangerous and as far as I know, it´s not actived > in oVirt, please correct me if I´m wrong. > > /K > >> >> Thanks >> >> Tibor >> >> >> ----- 2015. szept.. 8., 0:40, Alex McWhirter [email protected] írta: >> >>> 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 <[email protected]> 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 >> [email protected] >> http://lists.ovirt.org/mailman/listinfo/users > > _______________________________________________ > Users mailing list > [email protected] > http://lists.ovirt.org/mailman/listinfo/users _______________________________________________ Users mailing list [email protected] http://lists.ovirt.org/mailman/listinfo/users
