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<DIV><SPAN class=341551020-10092008><FONT face="Courier New" size=2>I am
building a system with a redundant MDS, that is two MDS sharing a set of disks,
one being Active, the other Standby.</FONT></SPAN></DIV>
<DIV><SPAN class=341551020-10092008><FONT face="Courier New"
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=341551020-10092008><FONT face="Courier New" size=2>If I put the
MGS and MDS on the same system, it appears that they must be on the same
partition as well. Otherwise, when there is a failover, the MGS will not
fail over. Is that true?<BR><BR>Assuming that it is true, then I mount the
MGS/MDT partition first, then all the OSTs.</FONT></SPAN></DIV>
<DIV><SPAN class=341551020-10092008><FONT face="Courier New"
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=341551020-10092008><FONT face="Courier New" size=2>When I
unmount, I usually want to unmount the MDT prior to unmounting the OSTs, because
the MDT is a client of the OSTs. Is that possible here? In other
words, I want to stop the MDT service first, then unmount the OSTs, then unmount
the MGS. How can I stop the MDT service?<BR><BR>If I don't do this, that
is, if I just unmount the OSTs followed by the MGS/MDT, then I get errors like
this:</FONT></SPAN></DIV>
<DIV><FONT face="Courier New" size=2></FONT> </DIV>
<DIV><FONT size=2><FONT face="Courier New">Lustre: raid6-OST0002-osc: Connection
to service raid6-OST0002 via nid </FONT><A href="mailto:10.2.46.74@o2ib"><FONT
face="Courier New">10.2.46.74@o2ib</FONT></A><FONT face="Courier New"> was lost;
in progress operations using this service will wait for recovery to
complete.</FONT></FONT></DIV>
<DIV><FONT><SPAN class=341551020-10092008></SPAN><FONT face="Courier New"
size=2><SPAN class=341551020-10092008>. . .</SPAN></FONT></FONT></DIV>
<DIV><FONT><FONT size=2><SPAN class=341551020-10092008><FONT
face="Courier New">LustreError: 8964:0:(lov_obd.c:418:lov_disconnect_obd())
Target raid6-OST0000_UUID disconnect error -5<BR>LustreError:
8964:0:(lov_obd.c:418:lov_disconnect_obd()) Target raid6-OST0002_UUID disconnect
error -5<BR>Lustre: Request x105 sent from raid6-OST0003-osc to NID </FONT><A
href="mailto:10.2.46.75@o2ib"><FONT
face="Courier New">10.2.46.75@o2ib</FONT></A><FONT face="Courier New"> 5s ago
has timed out (limit 5s).<BR></FONT></SPAN><FONT face="Courier New">.<SPAN
class=341551020-10092008> . .</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT><FONT face="Courier New"><SPAN class=341551020-10092008>Lustre: MGS
has stopped.<BR>Lustre: Mount still busy with 7 refs, waiting for 330
secs...<BR></SPAN><BR></FONT></FONT></DIV>
<DIV><FONT><SPAN class=341551020-10092008></SPAN><FONT size=2><FONT
face="Courier New">S<SPAN class=341551020-10092008>o, my question is: Is
there a way to stop just the MDT function PRIOR to unmounting the
OSTs?</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT><FONT face="Courier New" size=2><SPAN
class=341551020-10092008></SPAN></FONT></FONT> </DIV>
<DIV><FONT><FONT size=2><SPAN
class=341551020-10092008></SPAN></FONT></FONT><FONT><SPAN
class=341551020-10092008><FONT face="Courier New"
size=2>Thanks.</FONT></SPAN></FONT></DIV>
<DIV><FONT face="Courier New"><SPAN
class=341551020-10092008></SPAN></FONT> </DIV>
<DIV><FONT><SPAN class=341551020-10092008></SPAN></FONT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><?xml:namespace prefix = o
ns = "urn:schemas-microsoft-com:office:office" /><o:p><SPAN
class=341551020-10092008>-Roger</SPAN></o:p></SPAN></DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN
class=341551020-10092008></SPAN> </o:p></SPAN></DIV>
<DIV class=MsoNormal><FONT size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Roger
Spellman<o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Staff
Engineer<o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Terascala,
Inc.<o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">508-588-1501<o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><A
title=blocked::http://www.terascala.com/
href="http://www.terascala.com/">www.terascala.com</A><o:p></o:p></SPAN></FONT></DIV></BODY></HTML>