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Chapter 3 Multipath Driver Functions and Operation
3.1 Path Management
●
Example 1
Path status progression when a continuing error is detected by a normal active path I/O process.
Time
passed
-
0
1 minutes
:
10 minutes
:
14 minutes
15 minutes
●
Example 2
Auto path recovery operation after a failed path is replaced.
Time
passed
-
0 to 10
minutes
1 minutes
:
5 minutes
:
9 minutes
10 minutes
■
Transition to fatal fail
In the following cases, it is judged that the appropriate check cannot be performed and the path status
changes to fatal fail, after which the path will not be checked. A "forcible path degrade" message is sent to the
console.
•
Path stays in warning status for one hour.
•
Within one hour the path status changes from active/standby to warning and back 10 times.
Path 1 status
Path 2 status
active
standby
warning (50)
active
warning (60)
active
:
:
warning (150)
active
:
:
warning (190)
active
fail
active
Path 1 status
Path 2 status
fail
active
warning (100)
active
warning (90)
active
:
:
warning (50)
active
:
:
warning (10)
active
active
standby
FUJITSU Storage ETERNUS Multipath Driver V2 User's Guide for Linux
Copyright 2014 FUJITSU LIMITED
Operation
-
Error in normal I/O process on Path 1. Path 1 status changes
to warning, and the error counter is set by the error cause (the
minimum value of 50 in this example).
Retry after setting Path 2 active for the I/O process.
Check error. 10 added.
:
Check error. 10 added.
:
Check error. 10 added.
Check error. 10 added. Error counter reaches 200 and the
status changes to fail.
Path degradation message is sent to the console.
Operation
Maintenance replacement procedure completes.
Check is performed 10 minutes after completion of the
maintenance replacement.
Post replacement check gives a normal result, so status
changes to warning and the error counter is set to 100.
Check normal. 10 deducted.
:
Check normal. 10 deducted.
:
Check normal. 10 deducted.
Check normal. 10 deducted. Error counter reaches 0 and the
status changes to active.
Path 2 reverts to standby.
43
P2U3-0031-15ENZ0
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