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




Hannes,
 
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
 
(Gerald)
----- 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 :-)

Cheers,

Hannes
--
Dr. Hannes Reinecke       zSeries & Storage
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SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nrnberg
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Attachment: syslog.zip
Description: Zip compressed data


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