HP 3PAR HP-UX Implementation Guide

5. For the HP-UX host to use the SES LUN 254, a data VV LUN 254, if presented, must be
unpresented and steps 3 and 4 above executed.
For more detail and other variations of using the HP-UX 11.31 scsimgr utility, see the SCSI
Management and Diagnostics utility white paper, available on the HP Support Center.
HP Support Center
Restrictions on Volume Size and Number
Follow the guidelines for creating virtual volumes (VVs) and Virtual LUNs (VLUNs) in the HP 3PAR
Command Line Interface Administrator’s Manual while adhering to these cautions and guidelines:
• This configuration supports sparse LUNs (meaning that LUNs may be skipped). LUNs may
also be exported in non-ascending order (for example 0, 5, 7, 3).
• For HP-UX hosts, the HP 3PAR StoreServ supports the exportation of VLUNs with LUNs in the
range of 1 to 16838.
• Supported LUN size limits by an HP-UX host is dependent on the LVM version. See LVM Version
2.0 Volume Groups in HP-UX 11i v3 and LVM Version 1.0 Volume Groups in HP-UX 11i v2
on the HP Support Center.
Restrictions on Dynamic LUN Expansion and Contraction
Dynamic LUN expansion (DLE) is currently supported on HP-UX 11i v3 and HP 3PAR StoreServ
Storage systems with HP 3PAR OS 3.1.2, 3.1.1 MU1, or 2.3.1 MU5 software. Dynamic LUN
contraction (DLC) is not supported on HP 3PAR StoreServ Storage systems.
• Beginning with HP-UX 11i v3 March 2009 Update, administrators can use the online
vgmodify command to invoke DLE on LVM versions 2.x and 1.0.
• As a temporary workaround for HP 3PAR StoreServ Storage systems running HP 3PAR OS
versions older than HP 3PAR OS 3.1.1 MU1 or HP 3PAR OS 2.3.1 MU5, administrators can
leverage the HP-UX diskinfo command to trigger detection of the LUN expansion by the
operating system.
# diskinfo /dev/rdisk/disk100
Setting Up Multipathing Software on HP-UX 11i v3
HP 3PAR supports the HP-UX native multipathing solution.
1. In Agile Addressing Mode, the persistent DSF maps /dev/disk/diskXX to the device World
Wide Identifier (WWID) or serial number which correlates to an HP 3PAR StoreServ Storage
VV (VV WWN). This WWN is unique and is not affected by LUN path changes; the DSF is
using Agile addressing.
NOTE: Additional information on Agile Addressing Mode is provided in the Next Generation
Mass Storage Stack, HP-UX 11i v3 Native Multipathing for Mass Storage, and other documents
about storage area management for HP-UX 11i v3 are available at the HP SC:
HP Support Center
2. By default, the Agile Addressing Mode is enabled. After exporting, new VLUNs that are
exported while the host server is running will not be registered on the host until you issue the
ioscan command. This command scans the hardware for all the new and usable devices.
You can consult /var/adm/syslog/syslog.log during the discovery process to verify
that the new devices are being discovered. Special device files for the new devices (raw and
Restrictions on Volume Size and Number 21