<div dir="auto"><div>Hi,<div dir="auto"><br></div><div dir="auto">From strace, I can see the system calls setxattr and getxattr.</div><div dir="auto"><br></div><div dir="auto">Two things I don't understand is:</div><div dir="auto"><br></div><div dir="auto">1. how does the file got created so quickly, from where it read the stats.</div><div dir="auto">2.why is the added attribute missing if I check with getfattr?</div><div dir="auto"><br></div><div dir="auto">Regards,</div><div dir="auto">Jeevan.</div><div dir="auto"><br></div><div dir="auto"><br></div><br><div class="gmail_extra"><br><div class="gmail_quote">On Nov 13, 2017 12:40 PM, "Amar Tumballi" <<a href="mailto:atumball@redhat.com">atumball@redhat.com</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote"><div class="quoted-text">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-sta<wbr>ts-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><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 class="quoted-text"><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.commitha<wbr>sh="<a href="tel:03480%20667%20945" value="+913480667945" target="_blank">3480667945</a>"</div><div dir="auto"><br></div><div dir="auto">Regards,</div><div dir="auto">Jeevan.</div></div>
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<a href="http://lists.gluster.org/mailman/listinfo/gluster-users" rel="noreferrer" target="_blank">http://lists.gluster.org/mailm<wbr>an/listinfo/gluster-users</a><font color="#888888"><br></font></blockquote></div><font color="#888888"><br><br clear="all"><div><br></div>-- <br><div class="m_734755871683382892gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Amar Tumballi (amarts)<br></div></div></div></div></div>
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