[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: [dm-devel] multibus / failover and EMC CX600

nothing that looks really bedrohlich in the syslog.
What I have done:
9:47 multipathd -v 6 started
9:50 2:0:0:0 and 1:0:1:0 blocked (both paths to SP-A of the SAN)
9:52 2:0:0:0 and 1:0:1:0 re-enabled
I have attached my syslog.
I am on a gentoo with multipath 0.4.7
----- Original Message -----
Sent: Thursday, October 18, 2007 9:12 AM
Subject: Re: [dm-devel] multibus / failover and EMC CX600

On Thu, Oct 18, 2007 at 08:55:52AM +0200, Gerald Nowitzky wrote:
> Hannes,
> so is this behavior by design? In this case, patching in the scsi subsystem won't
> help to much, will it?
No, not really.
> Manually updating the multipath information - well, yes, that will work I guess,
> but in the end that should work without manual intervention. Thus, I'd need to have
> a job checking the multipath table if there are stale devices, and, if there are,
> rerun multipath to get them out. Not exactly smooth, is it?
Why, we do have interns for this kind of work :-)

No, really: Normally this should be done by multipathd / udev. With the mainline
multipathd it reads from the kernel netlink socket and will get a uevent if
a device is removed. And it should update the tables accordingly.

There have been problems with device-mapper itself (older versions required to
flush all outstanding I/O before the table could be modified), but that should
be resolved by now.

So maybe have multipathd running in verbose mode (ie -v 6 or somesuch) and see
what's going on. Especially why it isn't updating the device-mapper tables.

BTW, which distribution are you running? multipath & udev seem to be a tricky
area for most.

Not ours, of course :-)


Dr. Hannes Reinecke       zSeries & Storage
hare suse de       +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nrnberg
GF: Markus Rex, HRB 16746 (AG Nrnberg)

dm-devel mailing list
dm-devel redhat com

Attachment: syslog.zip
Description: Zip compressed data

[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]