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<DIV><FONT face=Verdana color=#000080 size=2>Thanks,</FONT></DIV>
<DIV><FONT color=#000080>I know,</FONT></DIV>
<DIV><FONT color=#000080>It will be better if without restart the
servers</FONT></DIV>
<DIV><FONT face=Verdana color=#000080 size=2></FONT> </DIV>
<DIV><FONT face=Verdana color=#000080 size=2></FONT> </DIV>
<DIV><FONT face=Verdana color=#c0c0c0 size=2>2009-10-22 </FONT></DIV><FONT
face=Verdana color=#000080 size=2>
<HR style="WIDTH: 122px; HEIGHT: 2px" align=left SIZE=2>
</FONT>
<DIV><FONT face=Verdana color=#c0c0c0 size=2><SPAN>xiechangcai</SPAN>
</FONT></DIV><FONT face=Verdana color=#000080 size=2>
<HR>
</FONT>
<DIV><FONT face=Verdana size=2><STRONG>发件人：</STRONG> Rob Ross </FONT></DIV>
<DIV><FONT face=Verdana size=2><STRONG>发送时间：</STRONG> 2009-10-22 11:46:39
</FONT></DIV>
<DIV><FONT face=Verdana size=2><STRONG>收件人：</STRONG> xiechangcai </FONT></DIV>
<DIV><FONT face=Verdana size=2><STRONG>抄送：</STRONG> Chris Worley; pvfs2-users
</FONT></DIV>
<DIV><FONT face=Verdana size=2><STRONG>主题：</STRONG> Re: [Pvfs2-users] File
affinity and CPU resource scheduling concernswhen using compute node as a PVFS
server </FONT></DIV>
<DIV><FONT face=Verdana size=2></FONT> </DIV>
<DIV><FONT face=Verdana size=2>
<DIV>Hi,</DIV>
<DIV></DIV>
<DIV>You must stop the servers and clients and modify the config file to </DIV>
<DIV>list the new server, yes. You will not lose any data on the original </DIV>
<DIV>servers.</DIV>
<DIV></DIV>
<DIV>Rob</DIV>
<DIV></DIV>
<DIV>On Oct 21, 2009, at 8:32 PM, xiechangcai wrote:</DIV>
<DIV></DIV>
<DIV>> Hi,Rob</DIV>
<DIV>> I'm a PVFS2 user ,</DIV>
<DIV>> I have a question, when i add one more i/o data server,</DIV>
<DIV>> I must change all the servers config file,and then restart pvfs2- </DIV>
<DIV>> server on all servers?</DIV>
<DIV>> is this true ?</DIV>
<DIV>> The original data on the I/O data servers can be lost ?</DIV>
<DIV>></DIV>
<DIV>></DIV>
<DIV>> 2009-10-22</DIV>
<DIV>> xiechangcai</DIV>
<DIV>> 发件人： Rob Ross</DIV>
<DIV>> 发送时间： 2009-10-22 02:08:05</DIV>
<DIV>> 收件人： Chris Worley</DIV>
<DIV>> 抄送： pvfs2-users</DIV>
<DIV>> 主题： Re: [Pvfs2-users] File affinity and CPU resource scheduling </DIV>
<DIV>> concernswhen using compute node as a PVFS server</DIV>
<DIV>> Hi Chris,</DIV>
<DIV>> Yes, you can certainly run PVFS servers on compute nodes. That's what</DIV>
<DIV>> we used to do all the time back in "the day", but it's still possible.</DIV>
<DIV>> The file system does not migrate files. In part this is because it</DIV>
<DIV>> would dramatically complicate metadata management, in part because we</DIV>
<DIV>> are frequently running in environments where there's no locality to</DIV>
<DIV>> exploit.</DIV>
<DIV>> You can choose to distribute over fewer (or just one) node, and there</DIV>
<DIV>> is functionality to discover where a file is stored, so you can map</DIV>
<DIV>> your computation onto the storage.</DIV>
<DIV>> Obviously yes, doing work on some other node will slow down</DIV>
<DIV>> computation on that node, how much depends on many things.</DIV>
<DIV>> Rob</DIV>
<DIV>> On Oct 21, 2009, at 12:40 PM, Chris Worley wrote:</DIV>
<DIV>> > I haven't looked at PVFS for nearly a decade, so my understanding</DIV>
<DIV>> > could be way out of date. Sorry if this is a stupid question; I'm</DIV>
<DIV>> > hoping PVFS might fill some requirements I'm looking at.</DIV>
<DIV>> ></DIV>
<DIV>> > Is it typical to use compute nodes as PVFS file servers? Is it even</DIV>
<DIV>> > possible (i.e. it isn't w/ Lustre)?</DIV>
<DIV>> ></DIV>
<DIV>> > If so, while striping across I/O nodes looks to be the default, is</DIV>
<DIV>> > there any provision for file affinity... i.e. files migrating to the</DIV>
<DIV>> > nodes using them?</DIV>
<DIV>> ></DIV>
<DIV>> > If striping is the only choice, and compute nodes serve the I/O too,</DIV>
<DIV>> > then a job running on one set of nodes could be using files striped</DIV>
<DIV>> > across another set of nodes in use by another job, causing both jobs</DIV>
<DIV>> > to loose performance, correct?</DIV>
<DIV>> ></DIV>
<DIV>> > Are there any links to PVFS performance over IB?</DIV>
<DIV>> ></DIV>
<DIV>> > Thanks,</DIV>
<DIV>> ></DIV>
<DIV>> > Chris</DIV>
<DIV>> _______________________________________________</DIV>
<DIV>> Pvfs2-users mailing list</DIV>
<DIV>> Pvfs2-users@beowulf-underground.org</DIV>
<DIV>> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users</DIV>
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