[Gluster-users] Gluster-users Digest, Vol 9, Issue 66

[Anand Avati]

Do you have write-behind loaded on the client side? For IO testing,
use /dev/zero instead of /dev/urandom.

avati

On Fri, Jan 23, 2009 at 2:14 AM, Evan <_Gluster at devnada.com> wrote:
> I have a 2 node single process AFR setup with 1.544Mbps bandwidth between
> the 2 nodes. When I write a 1MB file to the gluster share it seems to AFR to
> the other node in real time killing my disk IO speeds on the gluster mount
> point. Is there anyway to fix this? Ideally I would like to see near real
> disk IO speeds from/to the local gluster mount point and let the afr play
> catch up in the background as the bandwidth becomes available.
>
> Gluster Spec File (same on both nodes) http://pastebin.com/m58dc49d4
> IO speed tests:
> # time dd if=/dev/urandom of=/mnt/gluster/disktest count=1024 bs=1024
> 1024+0 records in
> 1024+0 records out
> 1048576 bytes (1.0 MB) copied, 8.34701 s, 126 kB/s
>
> real    0m8.547s
> user    0m0.000s
> sys     0m0.372s
>
> # time dd if=/dev/urandom of=/tmp/disktest count=1024 bs=1024
> 1024+0 records in
> 1024+0 records out
> 1048576 bytes (1.0 MB) copied, 0.253865 s, 4.1 MB/s
>
> real    0m0.259s
> user    0m0.000s
> sys     0m0.284s
>
>
> Thanks
>
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