Re: RHEL6.2: path failures during good path I/O

[Christian May <cmay@linux.vnet.ibm.com>]

Sorry, I did a mistake when testing with RHEL6.1....the multipath daemon 
was stopped.
So, also with RHEL6.1. I've noticed path failures. I'm trying to do some 
more testing - maybe it's related to
I/O workload. For my regular tests I'm attaching 10 SCSI LUns to the 
host system via two pathes.
On each multipath device 4 partitions will be created. Five multipath 
devices are going to be used for filesystem I/O, the remaining five for 
block I/O.
Currently I have just fs-I/O started and so far - 1h - no path failures 
occured. I will start block I/O later....

My guess why it could be device-mapper related is based on SLES11SP1 
bugzilla 62249 multipath-tools: multipath device path failure without 
error injection.



Am 14.06.2012 23:19, schrieb Mike Snitzer:
> On Thu, Jun 14 2012 at  3:15pm -0400,
> Christian May<cmay@linux.vnet.ibm.com>  wrote:
>
>> I couldn't recreate the path failures on the exact same test setup
>> with RHEL6.1.
>>
>> Something must have been changed in the device-mapper package!?
> It is good to know 6.1 works and 6.2 doesn't for you.  But I'm not
> understanding why you're thinking it is a device-mapper-multipath
> issue (not kernel issue).
>
> You could do a couple things:
> 1) run the RHEL6.2 kernel on a RHEL6.1 install
> 2) install RHEL6.1 device-mapper-multipath package on RHEL6.2 install
>
> If both work then it implicates the RHEL6.2 device-mapper-multipath
> package.
>
> But all being said, please just file a BZ at bugzilla.redhat.com
>