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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I bid adieu to you all with the hope of crossing path again, and the time has come rather quickly. It feels great to work on GlusterFS again.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Currently we are trying to write data backed up by Commvault Simpana to glusterfs volume (Disperse volume). To improve the performance, I have implemented the proposal put forward my Rafi K C [1]. I have some questions regarding libgfapi
and iobuf pool. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To reduce an extra level of copy in glfs read and write, I have implemented few APIs to request a buffer (similar to the one represented in [1]) from iobuf pool which can be used by the application to write data to. With this implementation,
when I try to reuse the buffer for consecutive writes, I could see a hang in syncop_flush of glfs_close (BT of the hang can be found in [2]). I wanted to know if reusing the buffer is recommended. If not, do we need to request buffer for each writes?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Setup : Distributed-Disperse ( 4 * (2+1)). Bricks scattered over 3 nodes.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[1] <a href="http://www.gluster.org/pipermail/gluster-devel/2015-February/043966.html">
http://www.gluster.org/pipermail/gluster-devel/2015-February/043966.html</a><o:p></o:p></p>
<p class="MsoNormal">[2] Attached file - bt.txt<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks & Regards,<o:p></o:p></p>
<p class="MsoNormal">Sachin Pandit.<o:p></o:p></p>
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