Re: [Users] Extremely poor disk access speeds in Windows guest

On Fri, 2014-01-31 at 11:37 -0500, Steve Dainard wrote: > I've reconfigured my setup (good succes below, but need clarity on > gluster option): > > > Two nodes total, both running virt and glusterfs storage (2 node > replica, quorum). > > > I've created an NFS storage domain, pointed at the first nodes IP > address. I've launched a 2008 R2 SP1 install with a virtio-scsi disk, > and the SCSI pass-through driver on the same node as the NFS domain is > pointing at. > > > Windows guest install has been running for roughly 1.5 hours, still > "Expanding Windows files (55%) ..." [VR] Does it work faster with IDE? Do you have kvm enabled? Thanks, Vadim. > > > top is showing: > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > > 3609 root 20 0 1380m 33m 2604 S 35.4 0.1 231:39.75 > glusterfsd > 21444 qemu 20 0 6362m 4.1g 6592 S 10.3 8.7 10:11.53 qemu-kvm > > > > This is a 2 socket, 6 core xeon machine with 48GB of RAM, and 6x > 7200rpm enterprise sata disks in RAID5 so I don't think we're hitting > hardware limitations. > > > dd on xfs (no gluster) > > > time dd if=/dev/zero of=test bs=1M count=2048 > 2048+0 records in > 2048+0 records out > 2147483648 bytes (2.1 GB) copied, 4.15787 s, 516 MB/s > > > real 0m4.351s > user 0m0.000s > sys 0m1.661s > > > > > time dd if=/dev/zero of=test bs=1k count=2000000 > 2000000+0 records in > 2000000+0 records out > 2048000000 bytes (2.0 GB) copied, 4.06949 s, 503 MB/s > > > real 0m4.260s > user 0m0.176s > sys 0m3.991s > > > > > I've enabled nfs.trusted-sync > ( http://gluster.org/community/documentation/index.php/Gluster_3.2:_Setting...) on the gluster volume, and the speed difference is immeasurable . Can anyone explain what this option does, and what the risks are with a 2 node gluster replica volume with quorum enabled? > > > Thanks,