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Appendix C: Volume Group Versions and LVM

Configuration Files

Volume Group Version

With the March 2008 release of HP-UX 11i v3, LVM supports a new version of volume group- Version

2.0. Version 1.0 is the version supported on all current and previous versions of HP-UX 11i.

A Version 2.0 volume group is a volume group whose metadata layout is different from the one used

for Version 1.0 volume groups. Version 2.0 enables the configuration of larger volume groups (up to

512), logical volumes (up to 511), physical volumes (up to 511) and several other volume group

parameters. A Version 2.0 volume group can be managed the same way as a Version 1.0 volume

group, using the same user interface. But features such as sparing, bad block relocation, cluster lock,

boot, dump, and primary swap are not supported on Version 2.0 volume groups. Also, the

vgmodify, pvck, lvlnboot and lvrmboot commands are not supported on Version 2.0

volume groups.

With the September 2008 release of HP-UX 11i v3, LVM supports another version of volume group-

version 2.1. You can manage a Version 2.1 volume group the same way as a Version 1.0 volume

group, using the same user interface. Version 2.1 is similar to Version 2.0, but allows configuration of

much greater number of volume groups (up to 2048), physical volumes (up to 2048) and logical

volumes (up to 2047). With this release, cluster lock is supported on Version 2.x volume groups.

Device Special Files

With the new volume group version, LVM device special files have changed. For Version 1.0 volume

groups, procedures to create the device files will not need to change. For Version 2.x volume groups,

there are a few differences illustrated in the following figure:

 Device special files for Version 1.0 volume groups are unchanged

 Device special files for Version 2.x volume groups have a new major number (128)

 Device special files for Version 2.x volume groups have a different minor number encoding scheme

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Seagate ST34572WC Spezifikationen Seite 46