Re: [PATCH 1/2] multipath-tools: change default failback from manual to immediate

[Xose Vazquez Perez <xose.vazquez@gmail.com>]

On 07/28/2016 04:03 PM, Hannes Reinecke wrote:

> On 07/11/2016 11:12 PM, Xose Vazquez Perez wrote:
>> Default value is: manual
>>       1                 .pgfailback    = 15,
>>       2                 .pgfailback    = 30,
>>      24                 .pgfailback    = FAILBACK_UNDEF,
>>      50                 .pgfailback    = -FAILBACK_IMMEDIATE,
>>
>> manual is not used by any device.
>>
>> Cc: Christophe Varoqui <christophe.varoqui@opensvc.com>
>> Cc: device-mapper development <dm-devel@redhat.com>
>> Signed-off-by: Xose Vazquez Perez <xose.vazquez@gmail.com>
>> ---
>>  libmultipath/defaults.h    |  2 +-
>>  libmultipath/hwtable.c     | 50 ----------------------------------------------
>>  multipath/multipath.conf.5 |  2 +-
>>  3 files changed, 2 insertions(+), 52 deletions(-)
>>

> 'immediate' fallback only makes sense if the device has a working
> prioritizer _and_ supports a 'preferred path'.

Then there are, at least, seven misconfigured devices.


What devices have support for referred_path?

Based on:		guess???
PRIO_ALUA		- YES
PRIO_CONST		-  NO
PRIO_EMC		- YES
PRIO_HDS		- YES
PRIO_HP_SW		-  NO
PRIO_ONTAP		- YES
PRIO_RDAC		- YES

Is there a hint anywhere?

> None of which can be assumed for an unknown device, so this patch
> will break automatic configuration.

As I said in my previous e-mail I don't believe in magic.
But this is up to you(plural: Christophe, Hannes, Benjamin, ...)