Technical data

Secure Path for Active-Active disk arrays with LVM PVLINKS
Secure Path takes control of the d evice configured under LVM with PVLINKS for alternate paths, and
overrides LVM PVLINKS to provide automatic I/O path failover and failback functionality. LVM PVLINKS
provides an alt
ernate path for the device during system reboot.
HP recommendations
HP recommends that you specify the physical volume paths while configuring LVM with PVLINKS and
using LVM PVLINKS with Secure Path for Active-Active disk arrays. The alternate physical paths a re a
combination of paths that emerge from different HBAs, pass through different switches, a nd map to
different controller p orts on the disk a rray.
In this configuration:
• Secure Path provides high availability and load balancing to the volume group when the system is
up and running.
• LVM PVLINKS provides high availability if the LVM primary pa th fails during system boot.
The following example shows the list of devices managed by Secure Path:
# autopath discover
# autopath display
==================================================================
HPswsp Version : A.3.0F.03F.00F
==================================================================
Auto Discover : OFF
==================================================================
Array Type : EVA-AA
Array WWN : 5000-1FE1-0015-3530
Read Optimize : ON
Path Verification Period : 00:10
==================================================================
Lun WWN : 6005-08B4-0010-735A-0000-5000-0082-0000
Virtual Device File : /hpap/dsk/hpap0
Load Balancing Policy : No Load Balancing
Lun Timeout : Infinite Retry (-1)
==================================================================
Device Path Status
==================================================================
/dev/dsk/c10t0d1 Active
/dev/dsk/c12t0d1 Active
/dev/dsk/c14t0d1 Active
/dev/dsk/c16t0d1 Active
==================================================================
The following example shows how to set the load balancing policy for all devices managed by Secure
Path:
# autopath set_lbpolicy < {policy name} {path} >
Policy name: The load balancing policy to set. Valid policies are
RR : Round Robin.
SST : Shortest Service Time.
SQL : Shortest Queue Length.
NLB/OFF : No load balancing.
Path: Device Special File e.g./dev/dsk/c#t#d#
Example: autopath set_lbpolicy RR /dev/dsk/c30t0d1
HPStorageWorksSecurePath3.0FServicePack3forHP-UX11iv1.0and11iv2.0
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