<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=us-ascii">
<META content="MSHTML 6.00.2900.2995" name=GENERATOR></HEAD>
<BODY>
<DIV dir=ltr align=left><SPAN class=958083322-12122006><FONT face=Arial
color=#0000ff size=2>Now is that a failure (not able to send heartbeats
indicates not able to run the original service as well),</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=958083322-12122006><FONT face=Arial
color=#0000ff size=2>or should that heartbeat stuff run with a higher priority
than the application?</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=958083322-12122006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=958083322-12122006><FONT face=Arial
color=#0000ff size=2>Michael</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> linux-cluster-bounces@redhat.com
[mailto:linux-cluster-bounces@redhat.com] <B>On Behalf Of </B>Coman
Iliut<BR><B>Sent:</B> Tuesday, December 12, 2006 12:31 PM<BR><B>To:</B> linux
clustering<BR><B>Subject:</B> Re: [Linux-cluster] Cluster heartbeat - minimum
nic speed<BR></FONT><BR></DIV>
<DIV></DIV>We've had issues with heartbeats being lost but it was always because
one node was internally too loaded, and the process sending heartbeats was not
getting enough time to run and send those heartbeats.<BR><BR>You must figure out
what is your network traffic from the apps you're running and make sure you're
under the H/W limit. Sending a heartbeat to the other node should not be a
problem if you're under the limit. <BR><BR>Coman<BR><BR>
<DIV><SPAN class=gmail_quote>On 11/16/06, <B class=gmail_sendername>David
Elliott</B> <<A
href="mailto:david.elliott@shazamteam.com">david.elliott@shazamteam.com</A>>
wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">Hello<BR><BR>We're
running a 2 node rhas4 cluster with gfs and fibre attached storage<BR><BR>At
the moment we have a pair of bonded 10/100 nics for heartbeat and
gfs<BR>locking communication (bonded in active/standby mode) <BR>There are an
additional pair of gigabit nics bonded for general
network<BR>traffic<BR><BR>We've been having some performance issues with GFS
which have been<BR>investigating - mainly to do with slow file stat operations
like find, <BR>and ls.<BR><BR>a comparison of a data set (700,000 files in a
single directory) on gfs<BR>and then on ext3 is below<BR><BR>#
GFS<BR>[root@mrapp1 ~]# time ls /free0/partnerimport/data/soap-2/
>/dev/null<BR><BR>real
17m10.035s<BR>user 0m8.220s<BR>sys
0m52.310s<BR><BR># EXT3<BR>[root@mrapp1 ~]# time ls
/mr/sig/partnerimport/data/soap-2 >
/dev/null<BR><BR>real 0m59.854s<BR>user 0m5.296s<BR>sys
0m0.662s<BR><BR><BR>Can anyone confirm whether using a 10/100 nic for
heartbeat would be <BR>having an impact on performance , and whether it would
be advisable to<BR>ensure these are gigabit?<BR><BR>Many
thanks<BR>Dave<BR><BR>--<BR>Linux-cluster mailing list<BR><A
href="mailto:Linux-cluster@redhat.com">Linux-cluster@redhat.com </A><BR><A
href="https://www.redhat.com/mailman/listinfo/linux-cluster">https://www.redhat.com/mailman/listinfo/linux-cluster</A><BR></BLOCKQUOTE></DIV><BR><BR
clear=all><BR>-- <BR>Coman ILIUT<BR><BR>Mitel Networks<BR>Ottawa, ON
<BR></BODY></HTML>