On 01/27/2014 03:40 PM, Fabio Rosati wrote:
Vijay,
I can confirm that enabling network.remote-dio on the volume solves the problem.
Do you think this is the best option also for performace?
Thanks for the confirmation. Yes, network.remote-dio is recommended to
be on for better performance.
Regards,
Vijay
Thanks a lot
Fabio
----- Messaggio originale -----
Da: "Vijay Bellur" <vbellur@xxxxxxxxxx>
A: "Pranith Kumar Karampuri" <pkarampu@xxxxxxxxxx>
Cc: "Fabio Rosati" <fabio.rosati@xxxxxxxxxxxxxxxxx>, "Gluster-users@xxxxxxxxxxx List" <gluster-users@xxxxxxxxxxx>
Inviato: Sabato, 25 gennaio 2014 11:25:01
Oggetto: Re: Replication delay
On 01/25/2014 03:36 PM, Pranith Kumar Karampuri wrote:
----- Original Message -----
From: "Vijay Bellur" <vbellur@xxxxxxxxxx>
To: "Pranith Kumar Karampuri" <pkarampu@xxxxxxxxxx>
Cc: "Fabio Rosati" <fabio.rosati@xxxxxxxxxxxxxxxxx>, "Gluster-users@xxxxxxxxxxx List" <gluster-users@xxxxxxxxxxx>
Sent: Saturday, January 25, 2014 3:32:24 PM
Subject: Re: Replication delay
On 01/25/2014 02:28 PM, Pranith Kumar Karampuri wrote:
Vijay,
But it seems like self-heal's fd is able to perform 'writes'.
Shouldn't it be uniform if it is the problem with xfs?
The problem is not with xfs alone. It is due to a combination of several
factors including disk sector size, xfs sector size and the nature of
writes being performed. With cache=none, qemu does O_DIRECT open() which
necessitates proper alignment for write operations to happen
successfully. Self-heal does not open() with O_DIRECT and hence write
operations initiated by self-heal go through.
I was also guessing it could be related to O_DIRECT. Anyway to fix that?
One option might be to enable option "network.remote-dio" on the
glusterfs volume. Fabio - can you please check if this works?
Wonder why it has to happen only on one of the bricks.
I suspect that the bricks are not completely identical. Hence it does go
through on one and fails on the other.
-Vijay
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