<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<br>
<div class="moz-forward-container">-------- Original Message
--------
<table class="moz-email-headers-table" border="0" cellpadding="0"
cellspacing="0">
<tbody>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Subject:
</th>
<td>Question regarding lustre patches</td>
</tr>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Date: </th>
<td>Mon, 18 Aug 2014 17:19:07 +0530</td>
</tr>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">From: </th>
<td>Pratik Rupala <a class="moz-txt-link-rfc2396E" href="mailto:pratik.rupala@calsoftinc.com"><pratik.rupala@calsoftinc.com></a></td>
</tr>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">To: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:lustre-devel@lists.lustre.org">lustre-devel@lists.lustre.org</a></td>
</tr>
</tbody>
</table>
<br>
<br>
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
Hi,<br>
<div class="moz-forward-container"> <br>
In the older version of lustre, I can see a patch named "<span
class="separator"></span><strong class="final-path">raid5-merge-ios-rhel5.patch</strong>"
which is related to RAID performance improvement for RHEL5. <br>
<br>
As per my understanding, it accumulates the bios in a single
make_request function of RAID layer and sends them collectively
by generic_make_request instead of sending them separately per
stripe basis. <br>
By this means, performance of RAID could be improved.<br>
<br>
But this patch is not present in newer version of lustre and
especially for RHEL6.<br>
<br>
So, is it possible to port that patch for RHEL 6, provided RAID
architecture is changed significantly and handling of stripe has
been made asynchronous in RHEL 6 as compared to synchronous
handling of stripe in RHEL 5?<br>
And even if it can be ported for RHEL6, will it give advantage
as it was giving in RHEL 5 with different RAID architecture?<br>
<br>
<br>
Regards,<br>
Pratik<br>
</div>
<br>
</div>
<br>
</body>
</html>