[Bug 1013724] Re: Setting "prio const" in multipath.conf has no effect

[Peter Petrakis]

Please provide the entire multipath.conf file, in the meanwhile try stopping the
daemon, perform a table flush (multipath -F) , then simply run multipath -v4
(no daemon) and observe the results.


** Changed in: multipath-tools (Ubuntu)
       Status: New => Incomplete

** Changed in: multipath-tools (Ubuntu)
     Assignee: (unassigned) => Peter Petrakis (peter-petrakis)

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Title:
  Setting "prio const" in multipath.conf has no effect

Status in “multipath-tools” package in Ubuntu:
  Incomplete

Bug description:
  We are trying to activate the active/active configuration in
  multipathd, for 2 paths between an AMS2100 array and a Ubuntu 12.04
  Server.

  We set "prio const" in /etc/multipath.conf. After starting the multipath daemon, we observe the following:
  a) # multipath -ll
  mpath0 (360060e80104dac0004f349c800000000) dm-0 HITACHI,DF600F
  size=100G features='1 queue_if_no_path' hwhandler='0' wp=rw
  |-+- policy='round-robin 0' prio=1 status=active
  | `- 8:0:0:0 sdc 8:32 active ready running
  `-+- policy='round-robin 0' prio=0 status=enabled
    `- 7:0:0:0 sdb 8:16 active ready running

  Paths have different priorities.

  b) multipath -v4
  Jun 15 16:39:01 | sdb: not found in pathvec
  Jun 15 16:39:01 | sdb: mask = 0x1f
  Jun 15 16:39:01 | sdb: dev_t = 8:16
  Jun 15 16:39:01 | sdb: size = 209715200
  Jun 15 16:39:01 | sdb: subsystem = scsi
  Jun 15 16:39:01 | sdb: vendor = HITACHI
  Jun 15 16:39:01 | sdb: product = DF600F
  Jun 15 16:39:01 | sdb: rev = 0000
  Jun 15 16:39:01 | sdb: h:b:t:l = 7:0:0:0
  Jun 15 16:39:01 | sdb: serial = 830530000000
  Jun 15 16:39:01 | sdb: get_state
  Jun 15 16:39:01 | loading /lib/multipath/libchecktur.so checker
  Jun 15 16:39:01 | sdb: path checker = tur (controller setting)
  Jun 15 16:39:01 | sdb: state = running
  Jun 15 16:39:01 | sdb: state = 3
  Jun 15 16:39:01 | loading /lib/multipath/libpriohds.so prioritizer
  Jun 15 16:39:01 | sdb: prio = hds (controller setting)
  Jun 15 16:39:01 | sdb: prio args = (null) (controller setting)
  Jun 15 16:39:01 | sdb: hds prio: VENDOR: HITACHI
  Jun 15 16:39:01 | sdb: hds prio: PRODUCT: DF600F
  Jun 15 16:39:01 | sdb: hds prio: SERIAL: 0x3000
  Jun 15 16:39:01 | sdb: hds prio: LDEV: 0x0000
  Jun 15 16:39:01 | sdb: hds prio: CTRL: 1
  Jun 15 16:39:01 | sdb: hds prio: PORT: E
  Jun 15 16:39:01 | sdb: hds prio: CTRL ODD, LDEV EVEN, PRIO 0 <---------------- PRIO HERE
  Jun 15 16:39:01 | sdb: hds prio = 0
  Jun 15 16:39:01 | sdb: getuid = /lib/udev/scsi_id --whitelisted --device=/dev/%n (controller setting)
  Jun 15 16:39:01 | sdb: uid = 360060e80104dac0004f349c800000000 (callout)
  Jun 15 16:39:01 | Discover device /sys/block/sdc
  Jun 15 16:39:01 | sdc: not found in pathvec
  Jun 15 16:39:01 | sdc: mask = 0x1f
  Jun 15 16:39:01 | sdc: dev_t = 8:32
  Jun 15 16:39:01 | sdc: size = 209715200
  Jun 15 16:39:01 | sdc: subsystem = scsi
  Jun 15 16:39:01 | sdc: vendor = HITACHI
  Jun 15 16:39:01 | sdc: product = DF600F
  Jun 15 16:39:01 | sdc: rev = 0000
  Jun 15 16:39:01 | sdc: h:b:t:l = 8:0:0:0
  Jun 15 16:39:01 | sdc: serial = 830530000000
  Jun 15 16:39:01 | sdc: get_state
  Jun 15 16:39:01 | sdc: path checker = tur (controller setting)
  Jun 15 16:39:01 | sdc: state = running
  Jun 15 16:39:01 | sdc: state = 3
  Jun 15 16:39:01 | sdc: prio = hds (controller setting)
  Jun 15 16:39:01 | sdc: prio args = (null) (controller setting)
  Jun 15 16:39:01 | sdc: hds prio: VENDOR: HITACHI
  Jun 15 16:39:01 | sdc: hds prio: PRODUCT: DF600F
  Jun 15 16:39:01 | sdc: hds prio: SERIAL: 0x3000
  Jun 15 16:39:01 | sdc: hds prio: LDEV: 0x0000
  Jun 15 16:39:01 | sdc: hds prio: CTRL: 2
  Jun 15 16:39:01 | sdc: hds prio: PORT: E
  Jun 15 16:39:01 | sdc: hds prio: CTRL EVEN, LDEV EVEN, PRIO 1 <--------------- PRIO HERE
  Jun 15 16:39:01 | sdc: hds prio = 1
  Jun 15 16:39:01 | sdc: getuid = /lib/udev/scsi_id --whitelisted --device=/dev/%n (controller setting)
  Jun 15 16:39:01 | sdc: uid = 360060e80104dac0004f349c800000000 (callout)

  In this output, the 2 paths have different priorities and even if we
  have set "prio const" in our configuration file, multipathd sets prio
  hds on its own.

  c) # echo "show config" | multipathd -k
   device {
    vendor "HITACHI "
    product "DF600F.*"
    path_grouping_policy multibus
    getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n"
    path_checker tur
    checker tur
    prio const
    no_path_retry queue
   }
  This is the last device entry in the configuration of the running daemon.

  d) iostat -m 2
  Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtn
  sda 0.00 0.00 0.00 0 0
  dm-0 775.50 96.72 0.00 193 0
  dm-1 0.00 0.00 0.00 0 0
  dm-2 0.00 0.00 0.00 0 0
  dm-3 0.00 0.00 0.00 0 0
  sdb 0.00 0.00 0.00 0 0
  sdc 775.50 96.72 0.00 193 0 <----- All I/O on one device only.

  NOTE: AMS2100 and higher models support active/active architecture and
  all paths are considered owner paths and can accept I/O from all
  available/assigned ports.

  Below are system specifics:
  1) lsb_release -rd
  Description:	Ubuntu 12.04 LTS
  Release:	12.04

  2) Package version
  multipath-tools:
    Installed: 0.4.9-3ubuntu5
    Candidate: 0.4.9-3ubuntu5
    Version table:
   *** 0.4.9-3ubuntu5 0
          500 http://gr.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
          100 /var/lib/dpkg/status

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