[Gluster-users] What is it with trusted.io-stats-dump?

Krutika Dhananjay kdhananj at redhat.com
Mon Nov 13 07:36:29 UTC 2017

trusted.io-stats-dump is a virtual (not physical) extended attribute.
The code is written in a way that a request to set trusted.io-stats-dump
gets bypassed at the io-stats translator layer on the stack and
there it gets converted into the action of dumping the statistics into the
provided output file path.
See io_stats_setxattr() implementation in io-stats.c for more details.


On Mon, Nov 13, 2017 at 12:14 PM, Jeevan Patnaik <g1patnaik at gmail.com>

> Hi,
> I am trying to understand how the extended attribute trusted.io-stats-dump
> works.
> setfattr -n trusted.io-stats-dump -v /tmp/gluster_perf_stats/io-stats-pre.txt
> /mnt/gluster/gv0_glusterfs
> I can see that the io-stats-pre.txt is created. But how and what happened
> in the background?
> And why I can't I see the attribute with getfattr again?
> getfattr -dm- /mnt/gluster/gv0_glusterfs
> # file: mnt/gluster/gv0_glusterfs
> trusted.glusterfs.dht.commithash="3480667945"
> Regards,
> Jeevan.
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