Mass storage stack manages I/O devices. In HP-UX 11i v3, the mass storage stack provides native multipathing and agile naming.
With agile naming, rather than being named by the hardware path to the object, I/O devices are named for actual object names. Because these device paths change dynamically, native multipathing provides a single virtualized path that represents multiple paths to single device.
To support the mass storage stack and native multipathing of HP-UX version 11.31, the type attribute of related host objects must be specified as hpux. Although Device Special File (DSF) naming and physical volume links (PVLinks) are supported by HP-UX version 11.31, use the agile naming and native multipathing with the system. For more information about native multipathing support and mass storage stack support for HP-UX version 11.31, see the related Hewlett-Packard publications.
To discover and show all hardware paths and persistent DSFs of the attached disks, use the HP-UX version 11.31 command ioscan –fnNC disk. Lenovo Storage V7000volumes are discovered as IBM2145 disks.
To determine the open or closed state of paths to a system volume, use the HP-UX version 11.31 command scsimgr get_info all_lpt. The value for the worldwide ID (WWID) in the output of scsimgr matches the unique identifier (UID) of the volume on the system (volume_UID). Also, HP-UX version 11.31 September 2007 release and later implements the T10 ALUA support. Implicit ALUA support is integrated to the HP-UX host type of Lenovo Storage V7000 releases.
# scsimgr get_info all_lpt -D /dev/rdisk/disk1484 STATUS INFORMATION FOR LUN PATH : lunpath993 Generic Status Information SCSI services internal state = STANDBY Open close state = STANDBY Protocol = fibre_channel EVPD page 0x83 description code = 1 EVPD page 0x83 description association = 0 EVPD page 0x83 description type = 3 World Wide Identifier (WWID) = 0x600507680184000060000000000005d4 Total number of Outstanding I/Os = 0 Maximum I/O timeout in seconds = 30 Maximum I/O size allowed = 2097152 Maximum number of active I/Os allowed = 8 Maximum queue depth = 8 Queue full delay count = 0 Asymmetric state = ACTIVE/NON-OPTIMIZED Device preferred path = No Relative target port identifier = 256 Target port group identifier = 1 STATUS INFORMATION FOR LUN PATH : lunpath990 Generic Status Information SCSI services internal state = ACTIVE Open close state = ACTIVE Protocol = fibre_channel EVPD page 0x83 description code = 1 EVPD page 0x83 description association = 0 EVPD page 0x83 description type = 3 World Wide Identifier (WWID) = 0x600507680184000060000000000005d4 Total number of Outstanding I/Os = 0 Maximum I/O timeout in seconds = 30 Maximum I/O size allowed = 2097152 Maximum number of active I/Os allowed = 8 Maximum queue depth = 8 Queue full delay count = 0 Asymmetric state = ACTIVE/OPTIMIZED Device preferred path = No Relative target port identifier = 0 Target port group identifier = 0
The Dynamic LUN expansion feature in HP-UX version 11.31 supports system volume expansion. To use this feature, the system expandvdisksize command expands the capacity of a volume. For more information about host-side operations, see the Hewlett-Packard publication HP-UX System Administrator's Guide: Logical Volume Management: HP-UX 11i Version 3 .