[Gluster-devel] question on glusterfs kvm performance

[John Mark Walker]

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 at redhat.com> 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.
> 
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