HP P10000 HP 3PAR HP-UX 11i v2, v3 Implementation Guide (QL226-96021, August 2 - Page 19

Restrictions on Volume Size and Number, Restrictions on Dynamic LUN Expansion

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Restrictions on Volume Size and Number Follow the guidelines for creating virtual volumes (VVs) and Virtual LUNs (VLUNs) in the HP 3PAR InForm OS CLI 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 (e.g. 0, 5, 7, 3). • The HP 3PAR Storage System supports the exportation of VLUNs with LUNs in the range from 0 to 16838. Testing was limited to 256 LUNs per storage server port (target) using LUN numbers 1 to 256. • The maximum LUN size that can be exported to a HP-UX host is 16TB when the installed InForm OS version is 2.3.x. or later. The upper limits on a HP-UX host is dependant 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 11iv2 on http://www.hp.com. Restrictions on Dynamic LUN Expansion Dynamic LUN Expansion (DLE) is currently not supported on HP-UX 11iv3 and HP 3PAR Storage systems. • Beginning with HP-UX 11iv3 March 2009 Update, administrators can use the online vgmodify command to invoke Dynamic LUN Expansion (DLE) on LVM versions 2.x and 1.0. While HP 3PAR Storage Systems allow a LUN to be dynamically resized, the HP-UX Logical Volume Manager DLE feature is currently not supported with HP 3PAR Storage Systems. • As a temporary workaround, 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 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 WorldWide Identifier (WWID) or serial number which correlates to an HP 3PAR Storage System VV (VV WWN). This WWN is unique and is not affected by LUN path changes; the DSF is called 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 available at http://docs.hp.com. 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 block device paths) that are required to access the devices are created as part of the ioscan command by internally executing the insf -e command. # ioscan # tail -f /var/adm/sy slog/syslog.log vmunix: 0/0/4/1/0.0x20420002ac000036.0x400a000000000000 eslpt vmunix: 0/0/4/1/1.0x21520002ac000036.0x400a000000000000 eslpt vmunix: 64000/0xfa00/0x243 esdisk Restrictions on Volume Size and Number 19

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Restrictions on Volume Size and Number
Follow the guidelines for creating virtual volumes (VVs) and Virtual LUNs (VLUNs) in the
HP 3PAR
InForm OS CLI 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 (e.g. 0, 5, 7, 3).
•
The HP 3PAR Storage System supports the exportation of VLUNs with LUNs in the range from
0 to 16838. Testing was limited to 256 LUNs per storage server port (target) using LUN
numbers 1 to 256.
•
The maximum LUN size that can be exported to a HP-UX host is 16TB when the installed
InForm OS version is 2.3.x. or later. The upper limits on a HP-UX host is dependant 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 11iv2 on
h
t
tp://w
w
w
.hp
.co
m
.
Restrictions on Dynamic LUN Expansion
Dynamic LUN Expansion (DLE) is currently not supported on HP-UX 11iv3 and HP 3PAR Storage
systems.
•
Beginning with HP-UX 11iv3 March 2009 Update, administrators can use the online
vgmodify
command to invoke Dynamic LUN Expansion (DLE) on LVM versions 2.x and 1.0. While HP
3PAR Storage Systems allow a LUN to be dynamically resized, the HP-UX Logical Volume
Manager DLE feature is currently not supported with HP 3PAR Storage Systems.
•
As a temporary workaround, 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 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
WorldWide Identifier (WWID) or serial number which correlates to an HP 3PAR Storage
System VV (VV WWN). This WWN is unique and is not affected by LUN path changes; the
DSF is called 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 available at
h
t
tp://doc
s
.hp
.co
m
.
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
block device paths) that are required to access the devices are created as part of the
ioscan
command by internally executing the
insf -e
command.
# ioscan
# tail -f /var/adm/sy slog/syslog.log
vmunix: 0/0/4/1/0.0x20420002ac000036.0x400a000000000000 eslpt
vmunix: 0/0/4/1/1.0x21520002ac000036.0x400a000000000000 eslpt
vmunix: 64000/0xfa00/0x243 esdisk
Restrictions on Volume Size and Number
19