[dm-devel] [PATCH 06/57] Use ALUA for HP 3PAR

[Hannes Reinecke]

On 04/29/2016 12:25 AM, Sebastian Herbszt wrote:
> Hannes Reinecke wrote:
>> Signed-off-by: Hannes Reinecke <hare at suse.de>
>> ---
>>  libmultipath/hwtable.c | 12 ++++++------
>>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> You missed to also change multipath.conf.defaults.
>  
>> diff --git a/libmultipath/hwtable.c b/libmultipath/hwtable.c
>> index 28ee595..4549268 100644
>> --- a/libmultipath/hwtable.c
>> +++ b/libmultipath/hwtable.c
>> @@ -65,13 +65,13 @@ static struct hwentry default_hw[] = {
>>  		.vendor        = "3PARdata",
>>  		.product       = "VV",
>>  		.features      = DEFAULT_FEATURES,
>> -		.hwhandler     = DEFAULT_HWHANDLER,
>> -		.pgpolicy      = MULTIBUS,
>> -		.pgfailback    = FAILBACK_UNDEF,
>> +		.hwhandler     = "1 alua",
>> +		.pgpolicy      = GROUP_BY_PRIO,
>> +		.pgfailback    = -FAILBACK_IMMEDIATE,
>>  		.rr_weight     = RR_WEIGHT_NONE,
>> -		.no_path_retry = NO_PATH_RETRY_UNDEF,
>> -		.checker_name  = DEFAULT_CHECKER,
>> -		.prio_name     = DEFAULT_PRIO,
>> +		.no_path_retry = 18,
>> +		.checker_name  = TUR,
>> +		.prio_name     = PRIO_ALUA,
>>  		.prio_args     = NULL,
>>  	},
>>  	{
> 
> Can you please elaborate on this?
> I think the correct setting depends on the configured
> "host persona". Currently the expected value would be
> "Generic / 1". The patch changes it to "Generic-ALUA / 2".
> Does the above change still work if the "host persona" is
> not modified and still set to "Generic / 1"?
> 
I have never ever _seen_ an 3Par array, so I wasn't aware that you
could switch host 'persona'. So I have to rely on our partners (ie
HPE) for correct configuration here.
But given that fact we should better switch back to use the default
hw_handler and use the 'retain_attached_hw_handler' option.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare at suse.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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