[Gluster-users] Linux (ls -l) command pauses/slow on GlusterFS mounts

[Deepak Naidu]

I did strace & its waiting on IO.

--
Deepak

-----Original Message-----
From: Vijay Bellur [mailto:vbellur at redhat.com] 
Sent: Wednesday, August 10, 2016 2:17 PM
To: Deepak Naidu
Cc: gluster-users at gluster.org
Subject: Re: [Gluster-users] Linux (ls -l) command pauses/slow on GlusterFS mounts

On 08/10/2016 05:12 PM, Deepak Naidu wrote:
> Before we can try physical we wanted POC on VM.
>
> Just a note the VMs are decently powerful 18cpus, 10gig NIC, 45GB Ram 1TB SSD drives. This is per node spec.
>
> I don't see the ls -l command hanging when I try to list the files from the gluster-node VMs itself So the question.

The reason I alluded to a physical setup was to remove the variables that can affect performance in a virtual setup. The behavior is not usual for the scale of deployment that you mention. You could use strace in conjunction with gluster volume profile to determine where the latency is stemming from.

Regards,
Vijay

>
> --
> Deepak
>
>> On Aug 10, 2016, at 2:01 PM, Vijay Bellur <vbellur at redhat.com> wrote:
>>
>>> On 08/10/2016 04:54 PM, Deepak Naidu wrote:
>>> Anyone who has seen the issue in their env ?
>>
>>
>>> --
>>> Deepak
>>>
>>> -----Original Message-----
>>> From: gluster-users-bounces at gluster.org 
>>> [mailto:gluster-users-bounces at gluster.org] On Behalf Of Deepak Naidu
>>> Sent: Tuesday, August 09, 2016 9:14 PM
>>> To: gluster-users at gluster.org
>>> Subject: [Gluster-users] Linux (ls -l) command pauses/slow on 
>>> GlusterFS mounts
>>>
>>> Greetings,
>>>
>>> I have 3node GlusterFS on VM for POC each node has 2x bricks of 200GB. Regardless of what type of volume I create when listing files under directory using ls command the GlusterFS mount hangs pauses for few seconds. This is same if there're 2-5 19gb file each or 2gb file each. There are less than  10 files under the GlusterFS mount.
>>>
>>> I am using NFS-Ganesha for NFS server with GlusterFS and the Linux client is mounted using GlusterFS fuse mount with direct-io enabled.
>>>
>>> GlusterFS version 3.8(latest)
>>>
>>>
>>> Any insight is appreciated.
>>
>> This does not seem usual for the deployment that you describe. Can you try on a physical setup to see if the same behavior is observed?
>>
>> -Vijay
>>
>>
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