User`s guide

Checking mpxio status for driver mpt
WARNING: This operation will require a reboot.
Do you want to continue ? [y/n] (default: y) y
The changes will come into effect after rebooting the system.
Reboot the system now ? [y/n] (default: y) y
Note – During the reboot, /etc/vfstab and the dump conguration are updated to reect the
device name changes.
(Optional) After the reboot, if necessary, congure your applications to use new device names
as described by Device Name Change Considerations in
“Multipathing Considerations”on
page 42
.
Enabling or Disabling Multipathing on a Per-Port Basis
Multipathing can be enabled or disabled on specic Fibre Channel Host Bus Adapter (HBA)
controller ports. If you enable multipathing on a specic HBA port controller port, all
supported devices connected to that controller port will be enabled for multipath operation.
The following procedure applies to both SPARC and x86 based machines.
Port Conguration Considerations
Before you start conguring the software by port, consider the following:
■
FC global and per-port multipath settings are specied in the le /kernel/drv/fp.conf.
Per-port multipath settings have priority over the global setting. This means that if global
multipathing is enabled by a specic port has been disabled for multipathing, the port will
not be available in the multipathing conguration. Conversely, even if global multipathing
has been disabled, specic ports may be enabled for multipathing if they are listed in the
appropriate driver.conf(4) le.
■
Load balancing is controlled by the global load-balance property in
/kernel/drv/scsi_vhci.conf le and is not controlled on a per-port basis.
■
If a device has more than one path to the host, all paths to the device must be congured
with multipathing enabled or disabled.
■
Conguring multipathing by port enables the multipathing software to coexist with other
multipathing solutions like Symantec (VERITAS) Dynamic Multipathing (DMP), or EMC
PowerPath. However, devices and paths should not be shared between the multipathing
software and other multipathing solutions.
2
Enabling or Disabling Multipathing on a Per-Port Basis
Chapter 4 • Conguring Multipathing Software 45