[Gluster-users] GlusterFS behaviour on stat syscall with relatime activated

Simon Turcotte-Langevin simon.turcotte-langevin at ubisoft.com
Wed Feb 3 16:42:56 UTC 2016


Hi, we have multiple clusters of GlusterFS which are mostly alike. The typical setup is as such:


-          Cluster of 3 nodes

-          Replication factor of 3

-          Each node has 1 brick, mounted on XFS with RELATIME and NODIRATIME

-          Each node has 8 disks in RAID 0 hardware

The main problem we are facing is that observation of the access time of a file on the volume will update the access time.

The steps to reproduce the problem are:


-          Create a file (echo 'some data' > /mnt/gv0/file)

-          Touch its mtime and atime to some past date (touch -d 19700101 /mnt/gv0/file)

-          Touch its mtime to the current timestamp (touch -m /mnt/gv0/file)

-          Stat the file until atime is updated (stat /mnt/gv0/file)

o   Sometimes it's instant, sometimes it requires to execute the above command a couple of time



On the IRC channel, I spoke to a developer (nickname ndevos) who said that it might be a getxattr() syscall that could be called when stat() is called on a replicated volume.



Anybody can reproduce this issue? Is it a bug, or is it working as intended? Is there any workaround?



Thank you,

Simon
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.gluster.org/pipermail/gluster-users/attachments/20160203/22bf69ac/attachment.html>


More information about the Gluster-users mailing list