A path to a different device was added to an existing mapth

[Ilan Steinberg <ilan.steinberg@kaminario.com>]

[-- Attachment #1.1: Type: text/plain, Size: 8537 bytes --]

Hello,


I have never posted here before but I can across an interesting error.


I have run into a situation were a path (sdag) to LUN 15 with a scsi serial number of ending with 0xd5190010 was added to an mapth (mpathiw) which is for LUN 11 with scsi serial number ending with 0xd5190026 (sdz and sdw)


I would appreciate any help understanding how/why this happened.


Initiator Info:

Linux il-ksm3-044 2.6.32-431.el6.x86_64 #1

device-mapper-multipath version 0.4.9


multipath.conf:

defaults {
                   user_friendly_names     yes
                   polling_interval        10
                    verbosity               2
}
devices {
                    device  {
                             vendor                      "KMNRIO"
                             product                     "K2"
                         path_grouping_policy        multibus
                             getuid_callout          "/lib/udev/scsi_id --whitelisted --device=/dev/%n"
                             path_checker                tur
                             path_selector               "queue-length 0"
                             no_path_retry               fail
                             hardware_handler            "0"
                             rr_weight                   priorities
                             rr_min_io               1
                             failback                15
                             fast_io_fail_tmo        5
                             dev_loss_tmo            8
                             }
}


Since I see that sdz and sdw used to belong to mapthiv (was it renamed to mathiw?)

This might be useful info - in the bindings file I see:

...

mpathiv 20024f400d5190010                      <---------------------------------------- this is the scsi_sn of sdag

mpathiw 20024f400d5190026                     <---------------------------------------- this is the scsi_sn of sdz/w

...


I am adding the relevant host logs (I can add the full logs if needed) - error is in the last log line:

Mar 14 09:44:36 il-ksm3-044 kernel: sdag: detected capacity change from 0 to 322122547200

Mar 14 09:59:35 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] Warning! Received an indication that the LUN reached a thin provisioning soft threshold.

Mar 14 10:00:06 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] Warning! Received an indication that the LUN reached a thin provisioning soft threshold.

Mar 14 10:00:21 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] Warning! Received an indication that the LUN reached a thin provisioning soft threshold.

Mar 14 10:26:31 il-ksm3-044 kernel: end_request: I/O error, dev sdz, sector 167369280
Mar 14 10:26:31 il-ksm3-044 kernel: end_request: I/O error, dev sdz, sector 80032448

Mar 14 10:26:44 il-ksm3-044 multipathd: sdz: remove path (uevent)
Mar 14 10:26:44 il-ksm3-044 multipathd: sdz [65:144]: path removed from map mpathiv
Mar 14 10:26:44 il-ksm3-044 multipathd: sdag: remove path (uevent)
Mar 14 10:26:44 il-ksm3-044 multipathd: sdag [66:0]: path removed from map mpathks

Mar 14 10:26:44 il-ksm3-044 multipathd: mpathiv: load table [0 209715200 multipath 0 0 1 1 queue-length 0 1 1 65:96 1]
Mar 14 10:26:44 il-ksm3-044 multipathd: mpathks: load table [0 629145600 multipath 0 0 1 1 queue-length 0 1 1 65:240 1]

Mar 14 10:53:50 il-ksm3-044 kernel: sd 8:0:1:11: [sdz] 209715200 512-byte logical blocks: (107 GB/100 GiB)
Mar 14 10:53:50 il-ksm3-044 kernel: sd 8:0:1:11: [sdz] Write Protect is off
Mar 14 10:53:50 il-ksm3-044 kernel: sd 8:0:1:11: [sdz] Write cache: disabled, read cache: enabled, supports DPO and FUA
Mar 14 10:53:50 il-ksm3-044 kernel: sdz:
Mar 14 10:53:50 il-ksm3-044 kernel: sd 8:0:1:11: [sdz] Attached SCSI disk
Mar 14 10:53:50 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] 629145600 512-byte logical blocks: (322 GB/300 GiB)
Mar 14 10:53:50 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] Write Protect is off
Mar 14 10:53:50 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] Write cache: disabled, read cache: enabled, supports DPO and FUA
Mar 14 10:53:50 il-ksm3-044 kernel: sdag: unknown partition table
Mar 14 10:53:50 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] Attached SCSI disk
Mar 14 10:53:50 il-ksm3-044 multipathd: sdag: add path (uevent)
Mar 14 10:53:50 il-ksm3-044 multipathd: mpathks: failed in domap for addition of new path sdag
Mar 14 10:53:50 il-ksm3-044 multipathd: sdz: add path (uevent)
Mar 14 10:53:50 il-ksm3-044 multipathd: sdz [65:144]: path added to devmap mpathiv

Mar 14 10:53:50 il-ksm3-044 multipathd: mpathiv: load table [0 209715200 multipath 0 0 1 1 queue-length 0 2 1 65:96 1 65:144 1]

Mar 14 12:29:12 il-ksm3-044 multipathd: sdw: remove path (uevent)
Mar 14 12:29:12 il-ksm3-044 multipathd: mpathiv: load table [0 209715200 multipath 0 0 1 1 queue-length 0 1 1 65:144 1]
Mar 14 12:29:12 il-ksm3-044 multipathd: sdw [65:96]: path removed from map mpathiv

Mar 15 12:45:59 il-ksm3-044 kernel: sd 8:0:1:11: [sdz] Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatically remap LUN assignments.

Mar 14 12:59:18 il-ksm3-044 kernel: sd 7:0:1:11: [sdw] 209715200 512-byte logical blocks: (107 GB/100 GiB)
Mar 14 12:59:18 il-ksm3-044 kernel: sd 7:0:1:11: [sdw] Write Protect is off
Mar 14 12:59:18 il-ksm3-044 kernel: sd 7:0:1:11: [sdw] Write cache: disabled, read cache: enabled, supports DPO and FUA
Mar 14 12:59:18 il-ksm3-044 kernel: sd 7:0:1:11: [sdw] Attached SCSI disk

Mar 14 12:59:18 il-ksm3-044 multipathd: sdw: add path (uevent)
Mar 14 12:59:18 il-ksm3-044 multipathd: mpathiv: load table [0 209715200 multipath 0 0 1 1 queue-length 0 2 1 65:144 1 65:96 1]
Mar 14 12:59:18 il-ksm3-044 multipathd: sdw [65:96]: path added to devmap mpathiv

Mar 15 11:45:27 il-ksm3-044 kernel: sdz: detected capacity change from 0 to 107374182400

Mar 15 11:45:33 il-ksm3-044 multipathd: mpathiw: event checker started
Mar 15 11:45:33 il-ksm3-044 multipathd: mpathiw: devmap dm-13 added

Mar 15 12:28:12 il-ksm3-044 multipathd: mpathiw: event checker exit

Mar 15 12:28:15 il-ksm3-044 multipathd: mpathiw: event checker started
Mar 15 12:28:15 il-ksm3-044 multipathd: mpathiw: devmap dm-13 added

Mar 15 12:56:35 il-ksm3-044 kernel: end_request: I/O error, dev sdz, sector 204563968
Mar 15 12:56:35 il-ksm3-044 kernel: end_request: I/O error, dev sdz, sector 193484032
Mar 15 12:56:35 il-ksm3-044 multipathd: mpathiw: remaining active paths: 1

Mar 15 12:56:48 il-ksm3-044 multipathd: sdz: remove path (uevent)
Mar 15 12:56:48 il-ksm3-044 multipathd: mpathiw: load table [0 209715200 multipath 0 0 1 1 queue-length 0 1 1 65:96 1]
Mar 15 12:56:48 il-ksm3-044 multipathd: sdz [65:144]: path removed from map mpathiw
Mar 15 12:56:48 il-ksm3-044 multipathd: sdag: remove path (uevent)

Mar 15 13:27:00 il-ksm3-044 kernel: sd 8:0:1:11: [sdz] 209715200 512-byte logical blocks: (107 GB/100 GiB)
Mar 15 13:27:00 il-ksm3-044 kernel: sd 8:0:1:11: [sdz] Write Protect is off
Mar 15 13:27:00 il-ksm3-044 kernel: sd 8:0:1:11: [sdz] Write cache: disabled, read cache: enabled, supports DPO and FUA
Mar 15 13:27:00 il-ksm3-044 kernel: sdz: unknown partition table
Mar 15 13:27:00 il-ksm3-044 kernel: sd 8:0:1:11: [sdz] Attached SCSI disk
Mar 15 13:27:00 il-ksm3-044 multipathd: sdz: add path (uevent)
Mar 15 13:27:00 il-ksm3-044 multipathd: mpathiw: failed in domap for addition of new path sdz

Mar 15 15:20:41 il-ksm3-044 multipathd: mpathiw: devmap dm-13 added

Mar 15 17:38:36 il-ksm3-044 kernel: sd 8:0:1:11: [sdz] Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatically remap LUN assignments.

Mar 15 18:44:54 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] 629145600 512-byte logical blocks: (322 GB/300 GiB)
Mar 15 18:44:54 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] Write Protect is off
Mar 15 18:44:54 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] Write cache: disabled, read cache: enabled, supports DPO and FUA
Mar 15 18:44:54 il-ksm3-044 kernel: sdag: unknown partition table
Mar 15 18:44:54 il-ksm3-044 kernel: sd 8:0:1:15: [sdag] Attached SCSI disk

Mar 15 18:44:55 il-ksm3-044 multipathd: sdag: add path (uevent)
Mar 15 18:44:55 il-ksm3-044 multipathd: mpathiw: load table [0 209715200 multipath 0 0 1 1 queue-length 0 3 1 65:96 1 65:144 1 66:0 1]
Mar 15 18:44:55 il-ksm3-044 multipathd: sdag [66:0]: path added to devmap mpathiw

Thank you,
Ilan Steinberg

[-- Attachment #1.2: Type: text/html, Size: 13518 bytes --]

[-- Attachment #2: Type: text/plain, Size: 0 bytes --]