<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Nov 13, 2017 at 12:14 PM, Jeevan Patnaik <span dir="ltr"><<a href="mailto:g1patnaik@gmail.com" target="_blank">g1patnaik@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">Hi,<div dir="auto"><br></div><div dir="auto">I am trying to understand how the extended attribute trusted.io-stats-dump works.</div><div dir="auto"><br></div><div dir="auto">setfattr -n trusted.io-stats-dump -v /tmp/gluster_perf_stats/io-<wbr>stats-pre.txt /mnt/gluster/gv0_glusterfs</div><div dir="auto"><br></div><div dir="auto">I can see that the io-stats-pre.txt is created. But how and what happened in the background?</div><div dir="auto"><br></div><div dir="auto">And why I can't I see the attribute with getfattr again?</div><div dir="auto"><br></div></div></blockquote><div><br></div><div>That is because 'trusted.io-stats-dump' is one of the many Virtual key GlusterFS handles.</div><div><br></div><div>As GlusterFS is a filesystem, the way to interact with it is through system calls. GlusterFS has some options for debugging in-built using 'setxattr()' and 'getxattr()' syscall interface, and they are called 'virtual keys'.</div><div><br></div><div>Regards,<br>Amar</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div dir="auto"></div><div dir="auto">getfattr -dm- /mnt/gluster/gv0_glusterfs</div><div dir="auto"># file: mnt/gluster/gv0_glusterfs</div><div dir="auto">trusted.glusterfs.dht.<wbr>commithash="3480667945"</div><div dir="auto"><br></div><div dir="auto">Regards,</div><div dir="auto">Jeevan.</div></div>
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