Re: multibus / failover and EMC CX600

["Gerald Nowitzky" <Nowitzky@igne.de>]

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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 ----- 
  From: Hannes Reinecke 
  To: device-mapper development 
  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
  hare@suse.de       +49 911 74053 688
  SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nrnberg
  GF: Markus Rex, HRB 16746 (AG Nrnberg)

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