HP EVA P6000 Storage User Manual
Page 37
Table 7 Failback preference settings (continued)
Behavior
Point in time
Setting
Otherwise, the units are brought online to
Controller 2.
All LUNs are brought online to the surviving
controller.
On controller failover
All LUNs remain on the surviving controller.
There is no failback except if a host moves the
LUN using SCSI commands.
On controller failback
The units are brought online to Controller 1.
At initial presentation
Path A -
Failover/Failback
If cache data for a LUN exists on a particular
controller, the unit will be brought online there.
On dual boot or controller resynch
Otherwise, the units are brought online to
Controller 1.
All LUNs are brought online to the surviving
controller.
On controller failover
All LUNs remain on the surviving controller.
After controller restoration, the units that are
On controller failback
online to Controller 2 and set to Path A are
brought online to Controller 1. This is a
one-time occurrence. If the host then moves the
LUN using SCSI commands, the LUN will
remain where moved.
The units are brought online to Controller 2.
At initial presentation
Path B -
Failover/Failback
If cache data for a LUN exists on a particular
controller, the unit will be brought online there.
On dual boot or controller resynch
Otherwise, the units are brought online to
Controller 2.
All LUNs are brought online to the surviving
controller.
On controller failover
All LUNs remain on the surviving controller.
After controller restoration, the units that are
On controller failback
online to Controller 1 and set to Path B are
brought online to Controller 2. This is a
one-time occurrence. If the host then moves the
LUN using SCSI commands, the LUN will
remain where moved.
describes the failback default behavior and supported settings when
ALUA-compliant multipath software is running with each operating system. Recommended settings
may vary depending on your configuration or environment.
Table 8 Failback settings by operating system
Supported settings
Default behavior
Operating system
No preference
Host follows the unit
1
HP-UX
Path A/B – Failover only
Path A/B – Failover/Failback
No preference
Auto failback done by the host
IBM AIX
Path A/B – Failover only
Path A/B – Failover/Failback
No preference
Auto failback done by the host
Linux
Operating tips and information
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