Re: Random Write Fio Test Delay

[Jan Schermer <jan@xxxxxxxxxxx>]

Is it only on the first run or on every run?

Fio first creates the file and that can take a while depeding on how fallocate() works on your system. In other words you are probably waiting for a 1G file to be written before the test actually starts.

Jan

On 31 Dec 2015, at 04:49, Sam Huracan <nowitzki.sammy@xxxxxxxxx> wrote:

Hi Ceph-users.

I have an issue with my new Ceph Storage, which is backend for OpenStack (Cinder, Glance, Nova). 

When I test random write in VMs with fio, there is a long delay (60s) before fio begin running.

Here is my script test:

fio --directory=/root/ --direct=1 --rw=randwrite --bs=4k --size=1G --numjobs=3 --iodepth=4 --runtime=60 --group_reporting --name=testIOPslan1 --output=testwriterandom

It is so strange, because I have not ever seen this method when I test in Physical machine.

My Ceph system include 5 node, 2 SAS 15k  per node, I use both journal and Filestore in one disk, Public Network 1 Gbps/Node, Replica Network 2 Gbps/Node

Here is my ceph.conf in node compute:

http://pastebin.com/raw/wsyDHiRw

Could you help me solve this issue?

Thanks and regards.

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