Bug#700444: multipath-tools: Automatic path recovery not occurring on IBM Power with dual VIOS served disks.

[Frank Fegert]

Hello,

On Wed, Feb 13, 2013 at 11:47:28AM +0530, Ritesh Raj Sarraf wrote:
> When you said temporary, are you sure when the paths recovered back?

well all other LPARs running AIX got their paths back ;-) So the
backend and the VIOSes were providing multiple paths again. After
the Debian LPAR was rebooted, all paths were back to normal. 

> When you thought the paths were back, were they responding to scsi commands?

Sorry, didn't check that at the time.

> You could use tools from the sg3-utils package or use the scsi_id
> program to  confirm that.

I'll try to setup a test environment.

> Any good reasons for using "no_path_retry 10" ???

At the top of my head, no. Might be a relict from earlier times, or
might be derived from the IBM SVC recommendations for Linux host
attachments ('no_path_retry "5"'). Although in this case the Debian
LPAR gets its SVC backed disks from the two VIOS rather than directly
from the SVC.

Thanks & best regards,

    Frank Fegert