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<DIV><FONT face=Arial size=2>Hannes,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>nothing that looks really bedrohlich in the
syslog.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>What I have done:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>9:47 multipathd -v 6 started</FONT></DIV>
<DIV><FONT face=Arial size=2>9:50 2:0:0:0 and 1:0:1:0 blocked (both paths to
SP-A of the SAN)</FONT></DIV>
<DIV><FONT face=Arial size=2>9:52 2:0:0:0 and 1:0:1:0 re-enabled</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have attached my syslog.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I am on a gentoo with multipath 0.4.7 </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>(Gerald)</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=hare@suse.de href="mailto:hare@suse.de">Hannes Reinecke</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=dm-devel@redhat.com
href="mailto:dm-devel@redhat.com">device-mapper development</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, October 18, 2007 9:12
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [dm-devel] multibus /
failover and EMC CX600</DIV>
<DIV><BR></DIV>On Thu, Oct 18, 2007 at 08:55:52AM +0200, Gerald Nowitzky
wrote:<BR>> Hannes,<BR>> <BR>> so is this behavior by design? In this
case, patching in the scsi subsystem won't<BR>> help to much, will
it?<BR>><BR>No, not really.<BR> <BR>> Manually updating the
multipath information - well, yes, that will work I guess,<BR>> but in the
end that should work without manual intervention. Thus, I'd need to
have<BR>> a job checking the multipath table if there are stale devices,
and, if there are,<BR>> rerun multipath to get them out. Not exactly
smooth, is it?<BR>><BR>Why, we do have interns for this kind of work
:-)<BR><BR>No, really: Normally this should be done by multipathd / udev. With
the mainline<BR>multipathd it reads from the kernel netlink socket and will
get a uevent if<BR>a device is removed. And it should update the tables
accordingly.<BR><BR>There have been problems with device-mapper itself (older
versions required to<BR>flush all outstanding I/O before the table could be
modified), but that should<BR>be resolved by now.<BR><BR>So maybe have
multipathd running in verbose mode (ie -v 6 or somesuch) and see<BR>what's
going on. Especially why it isn't updating the device-mapper
tables.<BR><BR>BTW, which distribution are you running? multipath & udev
seem to be a tricky<BR>area for most.<BR><BR>Not ours, of course
:-)<BR><BR>Cheers,<BR><BR>Hannes<BR>-- <BR>Dr. Hannes Reinecke
zSeries & Storage<BR><A
href="mailto:hare@suse.de">hare@suse.de</A> +49
911 74053 688<BR>SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nrnberg<BR>GF:
Markus Rex, HRB 16746 (AG Nrnberg)<BR><BR>--<BR>dm-devel mailing list<BR><A
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