Bharata: Thanks for writing this up. I bet someone could take this information and flesh out more scenarios + tests, posting the results on gluster.org. Any takers? -JM ----- Original Message ----- > On Wed, Aug 8, 2012 at 11:50 PM, John Mark Walker > <johnmark@xxxxxxxxxx> wrote: > > > > ----- Original Message ----- > >> > >> Or change your perspective. Do you NEED to write to the VM image? > >> > >> I write to fuse mounted GlusterFS volumes from within my VMs. The > >> VM > >> image is just for the OS and application. With the data on a > >> GlusterFS > >> volume, I get the normal fuse client performance from within my > >> VM. > > I ran FIO on 3 scenarios and here are the comparison numbers from > them: > > Scenario 1: GlusterFS block backend of QEMU is used for root and data > partition (a gluster volume) > ./x86_64-softmmu/qemu-system-x86_64 --enable-kvm --nographic -m 1024 > -smp 4 -drive file=gluster://bharata/rep/F16,if=virtio,cache=none > -drive file=gluster://bharata/test/F17,if=virtio,cache=none > > Scenario 2: GlusterFS block backend of QEMU for root and GlusterFS > FUSE mount for data partition > ./x86_64-softmmu/qemu-system-x86_64 --enable-kvm --nographic -m 1024 > -smp 4 -drive file=gluster://bharata/rep/F16,if=virtio,cache=none > -drive file=/mnt/F17,if=virtio,cache=none > (Here data partition is FUSE mounted on host at /mnt) > > Scenarios 3: GlusterFS block backend of QEMU for root and FUSE > mounting gluster data partition from inside VM > ./x86_64-softmmu/qemu-system-x86_64 --enable-kvm --nographic -m 1024 > -smp 4 -drive file=gluster://bharata/rep/F16,if=virtio,cache=none > > FIO exercises the data partition in each case. > > Here are the numbers: > > Scenario 1: aggrb=47836KB/s > Scenario 2: aggrb=20894KB/s > Scenario 3: aggrb=36936KB/s > > FIO load file I used is this: > ; Read 4 files with aio at different depths > [global] > ioengine=libaio > direct=1 > rw=read > bs=128k > size=512m > directory=/data1 > [file1] > iodepth=4 > [file2] > iodepth=32 > [file3] > iodepth=8 > [file4] > iodepth=16 > > Regards, > Bharata. > > _______________________________________________ > Gluster-devel mailing list > Gluster-devel@xxxxxxxxxx > https://lists.nongnu.org/mailman/listinfo/gluster-devel >
