What is the meaning of "show paths" output in multipathd -k

Solution Verified - Updated -

Issue

  • Run multipathd -k, and execute show paths command, for example:
multipathd> show paths
hcil    dev dev_t  pri dm_st   chk_st  next_check      
0:0:0:1 sda 8:0    1   [active][ready] XXXXXXXX.. 16/20
1:0:0:1 sdb 8:16   1   [active][ready] XXXXXXXX.. 16/20
2:0:0:1 sdc 8:32   1   [active][ready] XXXXXXXX.. 16/20
3:0:0:1 sdd 8:48   1   [active][ready] XXXXXXXX.. 16/20
4:0:0:1 sde 8:64   1   [active][ready] XXXXXXXX.. 16/20
5:0:0:1 sdf 8:80   1   [active][ready] XXXXXXXX.. 16/20
7:0:0:1 sdg 8:96   1   [active][ready] XXXXXXXX.. 16/20
6:0:0:1 sdh 8:112  1   [active][ready] XXXXXXXX.. 16/20
#:#:#:# vda 252:0  1   [undef] [ready] [orphan]        
#:#:#:# vdb 252:16 1   [undef] [ready] [orphan]        
  • Need to know what are the meanings of "undef" and "orphan", and the meaning of next_check field

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • device-mapper-multipath

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