Re: What is it with trusted.io-stats-dump?

[Krutika Dhananjay <kdhananj@xxxxxxxxxx>]

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.

HTH,

Krutika

On Mon, Nov 13, 2017 at 12:14 PM, Jeevan Patnaik <g1patnaik@xxxxxxxxx> wrote:

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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