HP-UX 11i v3 Installation and Update Guide, September 2009 (Update 5 Release)

11i v3” and “HP-UX 11i v3 Persistent DSF Migration Guide” (http://www.docs.hp.com/
en/oshpux11iv3.html#Storage%20Area%20Management ).
HP-UX 11i v3 device special files (DSF)
In a similar way to hardware paths, there are two types of Device Special Files (DSFs)
for mass storage: legacy DSFs and persistent DSFs. Both can be used to access a given
mass storage device independently, and can coexist on a given system.
DSFs: installing and updating
If you cold-install HP-UX 11i v3, both legacy and persistent DSFs are automatically
created. By default, the installation process will configure system devices like the boot,
root, swap, and dump devices to use persistent DSFs. This means that configuration
files such as/etc/fstab, /etc/lvmtab, and others will contain references to persistent
DSFs.
When you update from HP-UX 11i v2 to 11i v3, existing legacy DSFs are retained and
persistent DSFs will be created. Configuration files are not updated to use agile DSFs.
HP-UX will continue to use the existing legacy DSFs referenced in configuration files.
Legacy DSFs are completely backward compatible, and will not be affected by any
persistent DSFs on the same server. A device can be simultaneously accessed via legacy
and persistent DSFs.
For more information, including definitions of legacy and persistent, see “The Next
Generation Mass Storage Stack: HP-UX 11i v3” and “HP-UX 11i v3 Persistent DSF
Migration Guide” (http://www.docs.hp.com/en/
oshpux11iv3.html#Storage%20Area%20Management).
Special considerations 39