hardware_handler parameter of MSA2040 at RHEL 7.4

[jclee]

There was a path problem with RHEL 7.4 on server superdome x:

Jul 26 02:47:49 ictasstgdb01 kernel: sd 0:0:0:0: alua: Detached
Jul 26 02:47:49 ictasstgdb01 kernel: sd 0:0:0:0: [sda] Synchronizing SCSI cache
Jul 26 02:47:49 ictasstgdb01 kernel: sd 0:0:0:0: [sda] Synchronize Cache(10) failed: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Jul 26 02:47:49 ictasstgdb01 multipathd: sda: remove path (uevent)

So Linux engineer recommended customer needs to change from hardware_handler "0" to hardware_handler "1 alua" :

# cat /etc/multipath.conf
defaults {
        find_multipaths yes
        user_friendly_names yes
}
devices {
        device{
                                vendor "HP"
                                product "MSA 2040 SAN"
                                path_grouping_policy group_by_prio
                                path_selector "round-robin 0"
                                path_checker tur
                                hardware_handler "0"   -> hardware_handler "1 alua"
                                failback immediate
                                rr_weight uniform
                                rr_min_io_rq 1
                                no_path_retry 3

I tried to find document related with that but I can't.
Can we change the parameter as linux engineer said ?

[SUBHAJIT KHANBARMAN_1]

The document you look for is called "Native Linux Device-Mapper Multipath for HPE Storage Arrays reference Guide",

https://hp--c.na86.content.force.com/servlet/servlet.FileDownload?file=00P1V00000cjcqe

Hope this helps!
Regards
Subhajit

If you feel this was helpful please click the KUDOS! thumb below!

***********************************************************************************

[SUBHAJIT KHANBARMAN_1]

@jclee.........if you are satisfied with the answers then kindly mark it as Solution so that others who are following this forum can get the Solution as well.

Hope this helps!
Regards
Subhajit

If you feel this was helpful please click the KUDOS! thumb below!

***********************************************************************************