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<p>Hello,</p>
<p><br>
</p>
<p>I have never posted here before but I can across an interesting error.</p>
<p><br>
</p>
<p>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)<br>
</p>
<p><br>
</p>
<p>I would appreciate any help understanding how/why this happened.<br>
</p>
<p><br>
</p>
<p>Initiator Info:<br>
</p>
<p>Linux il-ksm3-044 2.6.32-431.el6.x86_64 #1</p>
<p>device-mapper-multipath version 0.4.9</p>
<p><br>
</p>
<p>multipath.conf:</p>
<p><span style="font-size: 8pt;">defaults {<br style="">
user_friendly_names yes<br style="">
polling_interval 10<br style="">
verbosity 2<br style="">
}<br style="">
devices {<br style="">
device {<br style="">
vendor "KMNRIO"<br style="">
product "K2"<br style="">
path_grouping_policy multibus<br style="">
getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n"<br style="">
path_checker tur<br style="">
path_selector "queue-length 0"<br style="">
no_path_retry fail<br style="">
hardware_handler "0"<br style="">
rr_weight priorities<br style="">
rr_min_io 1<br style="">
failback 15<br style="">
fast_io_fail_tmo 5<br style="">
dev_loss_tmo 8<br style="">
}<br style="">
}<br style="">
</span></p>
<p><br>
</p>
<p>Since I see that sdz and sdw used to belong to mapthiv (was it renamed to mathiw?)<br>
</p>
<p>This might be useful info - in the bindings file I see:</p>
<p><span style="font-size: 10pt;">...</span></p>
<p><span style="font-size: 10pt;">mpathiv 20024f400d5190010 <---------------------------------------- this is the scsi_sn of sdag</span></p>
<p><span style="font-size: 10pt;">mpathiw 20024f400d5190026 <---------------------------------------- this is the scsi_sn of sdz/w</span></p>
<p><span style="font-size: 10pt;">...<br style="">
</span></p>
<p><br>
</p>
<p>I am adding the relevant host logs (I can add the full logs if needed) - error is in the last log line:<br style="font-size: 8pt;">
</p>
<pre class="bz_comment_text" id="comment_text_6"><span style="font-size: 8pt;">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: <strong>failed in domap for addition of new path sdz</strong>
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 <strong>66:0</strong> 1]
<strong>Mar 15 18:44:55 il-ksm3-044 multipathd: sdag [66:0]: path added to devmap mpathiw</strong></span></pre>
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<br>
Thank you,<br>
Ilan Steinberg<br>
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