Description of problem:
I have noticed this problem during my test on RHEL 6 snapshot 2. 
I have tried to change the default "no_path_retry" parameter for LSI storate.
This is how my devices section in multipath.conf looks like. 

devices {
 device {
  vendor                  "LSI"
  product                 "INF-01-00"
  path_grouping_policy    group_by_prio
  getuid_callout          "/lib/udev/scsi_id --whitelisted --device=/dev/%n"
  path_checker            rdac
  path_selector           "round-robin 0"
  hardware_handler        "1 rdac"
  failback                15
  rr_weight               priorities
  no_path_retry           fail
  }
}

My intention was only to change no_path_retry from quueing to fail. 

I re-started the multipath deamon but the parameter did not change. Multipath -ll showed like this.

mpathax (360080e50001b0982000059ab4be886b0) dm-36 LSI,INF-01-00
size=4.0G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 rdac' wp=rw
|-+- policy='round-robin 0' prio=6 status=active
| `- 8:0:0:44  sdcq 69:224  active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
  `- 9:0:0:44  sdcp 69:208  active ghost running


Version-Release number of selected component (if applicable):
RHEL 6 snopshot 2

How reproducible:

Always
Steps to Reproduce:
1. Install RHEL 6
2. Present some Luns from LSI storage
3. update the multipath.conf
4. restart the multipathd deamon.
  
Actual results:

Multipath -ll output did not show the updated no_path_retry parameter.

Expected results:
Multipath  -ll should show the updated no_path_retry parameter.

Additional info:

However, I did a little experimenet. I changed the vendor parameter in multipath.conf as below. 

 vendor                "(LSI|ENGENIO)"

This worked. I am sure this issue is related how the vendor id is present in the hwtable.c. I have looked at the hwtable.c entry. It is as below. Notice the 
.vendor parameter. 

 /* LSI Generic rdac storage */
        {
                .vendor        = "(LSI|ENGENIO)",
                .product       = "INF-01-00",
                .getuid        = DEFAULT_GETUID,
                .features      = "2 pg_init_retries 50",
                .hwhandler     = "1 rdac",
                .selector      = DEFAULT_SELECTOR,
                .pgpolicy      = GROUP_BY_PRIO,
                .pgfailback    = -FAILBACK_IMMEDIATE,
                .rr_weight     = RR_WEIGHT_NONE,
                .no_path_retry = 15,
                .minio         = DEFAULT_MINIO,
                .checker_name  = RDAC,
                .prio_name     = PRIO_RDAC,
        },