multipath priority value

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can someone tell me how to calculate the priority of path, I just know when we get the priority we can call the function /sbin/mpath_prio_alua, but I don't know what's the relationship between the priority and storage.

as bellow, what's the meaning of prio value 50 for the storage?

cx0154_lun45 (36006016004003e00da14a1e1a6cce511) dm-13 DGC,RAID 10
[size=60G][features=0][hwhandler=1 alua][rw]
_ round-robin 0 [prio=50][active]
_ 3:0:1:12 sdag 66:0 [active][ready]
_ 3:0:3:12 sdbu 68:128 [active][ready]
_ 4:0:0:12 sdco 69:192 [active][ready]
_ 4:0:1:12 sddi 71:0 [active][ready]

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