[Gluster-users] Slow file open

Mohit Anchlia mohitanchlia at gmail.com
Tue May 3 16:22:58 UTC 2011

Yes I can reproduce everytime I run my tests.
This happens always. Not sure if you call 50 threads writing files to
4 X 2 servers high load.
Application see slower response time and low throughput. For eg: you
would expect at least 80MB/s on 1GigE with 4 X 2 when each cluster
with "dd" can do 130 MB/s. But because of this I see only 20-30MB/s.

On Mon, May 2, 2011 at 9:36 PM, Pavan <tcp at gluster.com> wrote:
> On Sunday 01 May 2011 03:59 AM, Mohit Anchlia wrote:
>> Can someone from dev help with this? Is it overhead in fuse or
>> something else? I am seeing file open operation taking anywhere
>> between 30ms - 2 secs and this is killing the performance.
> * Can you recreate this problem on your setup at will?
> * Does the delay happen when you are opening any file or is it under certain
> scenarios - like excessive load? What is application that is facing this
> hang?
> To start with, check if the open on the backend (on a single brick) is
> taking long, with the same application.
> Pavan
>> On Fri, Apr 29, 2011 at 4:27 PM, Mohit Anchlia<mohitanchlia at gmail.com>
>>  wrote:
>>> I am not seeing optimal performance out of my 4 X 2 cluster node. When
>>> I look at thread state that's writing files I see most of them are
>>> waiting on file open.
>>> Does anyone know how to further troubleshoot this issue?
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