HP-UX 11i v3 LVM New Features in HP-UX 11i v3 (September 2009)

4
y
le view. In this
nk) information. The
s to it. The
legacy
continues to exist. You can use both the DSF types to access a given
r more information, see the The Next
New functionalit
Support for Agile View of Mass Storage
HP-UX 11i v3 introduces a new representation of mass storage devices called the agi
representation, the device special file (DSF) name for each disk no longer contains path (or li
multipathed disk has a single
persistent DSF regardless of the number of physical path
view,
represented by the legacy DSF,
mass storage device independently and both can coexist on a system. Fo
Generation Mass Storage Stack whitepaper.
configuration commands support both DSF naming models.
ombination of
HP recommends the use of persistent DSFs for LVM configurations and encourages configuring new volume
e all the capabilities of the new mass storage stack, HP recommends
migrating volume groups from legacy DSFs to persistent DSFs. HP provides
/usr/contrib/bin/vgdsf to
ore information, see the
Wherever applicable, LVM
LVM enables you to configure volume groups with all persistent DSFs, all legacy DSFs, or a c
persistent DSFs and legacy DSFs.
groups using persistent DSFs. To fully utiliz
facilitate this migration. The script works for both root and non-root volume groups. For m
LVM Migration from Legacy to Agile Naming Model
whitepaper.
Multipathing and Alternate Links (PVlinks)
mass storage stack.
istent DSF for each mass storage device regardless of the number of
e transparent
Management of multipathed devices is available outside of LVM using the next generation
Agile addressing creates a single pers
hardware paths to the disk. The mass storage stack in HP-UX 11i v3 uses that agility to provid
multipathing. For more information, see the The Next Generation Mass Storage Stack
whitepaper.
ty is now redundant, but this functionality is still supported with legacy
they did in previous releases when the mass storage stack native multipathing
feature is disabled with the
scsimgr command.
the use of persistent
sf script, vgscan -N command, or vgimport -s -N commands perform this
conversion. For more information, see the LVM Migration from Legacy to Agile Naming Model
The LVM Alternate Link functionali
DSFs. Alternate links behave as
HP recommends converting volume groups with alternate links to use native multipathing by
DSFs. The
/usr/contrib/bin/vgd
whitepaper.
Some disk arrays allow the dynamic resizing of their LUNs. With HP-UX 11i v3, LVM detects and handles physical
for Version 1.0
VM supports, see the
Dynamic LUN Expansion (DLE)
volume size changes on invocation of the
vgmodify command. This command is supported
volume groups only. For more information on different versions of volume groups that L
“Version 2.x Volume Groups
” section.
vgmodify(1M)
The vgmodify command provides a method to alter the attributes of a physical volume and volume group after
pvcreate and vgcreate operations, respectively. You must run the vgmodify command to update the LVM configuration
to reflect any change to the physical volume size.
Prior to September 2008 release of HP-UX 11i v3, you can alter the attributes of a physical volume or a volume
group using the
vgmodify command only when the volume group is deactivated. Starting with the September
2008 release of HP-UX 11i v3, LVM supports handling dynamic LUN expansion of physical volumes using the
vgmodify command when the volume group is active. This is referred to as online DLE. To support online DLE,