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Continuous Linux Host DMMP failovers with Oracle ASM, within an E-Series environment

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Applies to

  • E-Series
  • Oracle ASM
  • Device Mapper Multipath (DMMP)

Issue

The following symptoms are possible with the E-Series product:

  • Continuous failovers
  • Implicit volume transfers
  • LUN on non-preferred path messages
  • Performance impact

 

The following error messages is reported repeatedly in the host logs (/var/log/messages):

May 18 03:47:40 hostname kernel: sd 5:0:0:3: rdac: array example, ctlr 0, queueing MODE_SELECT command
May 18 03:47:40 hostname kernel: sd 5:0:0:3: rdac: array example, ctlr 0, MODE_SELECT returned with sense 06/94/01
May 18 03:47:40 hostname kernel: sd 5:0:0:3: rdac: array example, ctlr 0, retrying MODE_SELECT command
May 18 03:47:40 hostname kernel: sd 5:0:0:3: rdac: array example, ctlr 0, MODE_SELECT completed
May 18 03:48:00 hostname multipathd: vol1: load table [0 209715200 multipath 1 queue_if_no_path 1 rdac 2 1 round-robin 0 1 1 8:144 1 round-robin 0 1 1 8:112 1]
May 18 03:48:21 hostname multipathd: vol3: load table [0 629145600 multipath 1 queue_if_no_path 1 rdac 2 1 round-robin 0 1 1 8:80 1 round-robin 0 1 1 8:64 1]
May 18 03:48:21 hostname kernel: sd 5:0:0:1: rdac: array example, ctlr 0, queueing MODE_SELECT command
May 18 03:48:21 hostname kernel: sd 5:0:0:1: rdac: array example, ctlr 0, MODE_SELECT returned with sense 06/94/01May 18 03:48:21 hostname kernel: sd 5:0:0:1: rdac: array example, ctlr 0, retrying MODE_SELECT command
May 18 03:48:21 hostname kernel: sd 5:0:0:1: rdac: array example, ctlr 0, MODE_SELECT completed
May 18 03:48:40 hostname multipathd: vol2: load table [0 209715200 multipath 1 queue_if_no_path 1 rdac 2 1 round-robin 0 1 1 8:160 1 round-robin 0 1 1 8:176 1]
May 18 03:48:40 hostname multipathd: vol2: load table [0 209715200 multipath 1 queue_if_no_path 1 rdac 2 1 round-robin 0 1 1 8:160 1 round-robin 0 1 1 8:176 1]
May 18 03:48:40 hostname kernel: sd 6:0:0:4: rdac: array example, ctlr 1, queueing MODE_SELECT command
May 18 03:48:40 hostname kernel: sd 6:0:0:4: rdac: array example, ctlr 1, MODE_SELECT returned with sense 06/94/01
May 18 03:48:40 hostname kernel: sd 6:0:0:4: rdac: array example, ctlr 1, retrying MODE_SELECT command
May 18 03:48:40 hostname kernel: sd 6:0:0:4: rdac: array example, ctlr 1, MODE_SELECT completed

 

 

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