Failback Settings By Operating System - HP StorageWorks 6400/8400 - Enterprise Virtual Array User Manual

Setting Point in time
On dual boot or controller resynch
On controller failover
On controller failback
At initial presentation
On dual boot or controller resynch
Path B - Failover/Fail-
On controller failover
back
On controller failback
Table 13 describes the failback default behavior and supported settings when Secure Path is running
with each operating system or when MPIO 2.x or 3.x is running with Windows.
Table 13 Failback settings by operating system
Operating system Default behavior
1
Failback performed on the host
HP-UX
Tru64 UNIX Host follows the unit
OpenVMS Host follows the unit
48 EVA6400/8400 operation
Behavior
If cache data for a LUN exists on a partic-
ular controller, the unit will be brought
online there. Otherwise, the units are
brought online to Controller A.
All LUNs are brought online to the surviv-
ing controller.
All LUNs remain on the surviving control-
ler. After controller restoration, the units
that are online to Controller B and set to
Path A are brought online to Controller A.
This is a one time occurrence. If the host
then moves the LUN using SCSI com-
mands, the LUN will remain where moved.
The units are brought online to Controller
B.
If cache data for a LUN exists on a partic-
ular controller, the unit will be brought
online there. Otherwise, the units are
brought online to Controller B.
All LUNs are brought online to the surviv-
ing controller.
All LUNs remain on the surviving control-
ler. After controller restoration, the units
that are online to Controller A and set to
Path B are brought online to Controller B.
This is a one time occurrence. If the host
then moves the LUN using SCSI com-
mands, the LUN will remain where moved.
Settings supported
No Preference
Path A/B Failover Only
All settings allowed:
No Preference
Path A/B Failover Only
Path A/B Failover/Failback (recommended)
All settings allowed:
No Preference
Path A/B Failover Only
Path A/B Failover/Failback (recommended)