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

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Agi
hysical location of the
LUN remains the
ved from one HBA to another, moved from one switch/hub port to another,
presented via a different target port to the host, or configured with multiple hardware paths. Also referred
as
persistent LUN binding.
Agile View
The representation of LUNs using lunpath hardware paths, LUN hardware paths, and persistent DSFs,
Hardware Path
ies of numbers representing the physical or virtualized location of a device. The path is a sequence
ight not correspond to
ght represent only a “handle” to a device rather than a physical path
Leg
es prior to HP-UX 11i v3.
xists in releases prior to HP-UX 11i v3. It is composed of a
series of bus-nexus addresses separated by ‘/’ leading to the HBA; beneath the HBA, additional address
elements (such as domain, area, port, target, and LUN) are separated by ‘.’. The string
y DSF
ded in the file’s
minor name and file name, such as
/dev/dsk/c2t3d4.
LU
refers to an end storage device such as a disk, tape, floppy, or CD. This is the
gical unit itself and does not represent the path to the logical unit.
The physical hardware path leading to a SCSI logical unit. A SCSI LUN can have more than one lunpath.
Persistent DSF
A DSF conforming to the naming model introduced in HP-UX 11i v3 to support agile addressing. The
device file name contains an instance number, such as
/dev/disk/disk#, and the minor number has
no hardware path information.
Metadata
The on-disk structures that LVM uses to manage a volume group. This space is not available for
application data.
Glossary
le Addressing
The ability to address a LUN with the same device special file regardless of the p
LUN or the number of paths leading to it. In other words, the device special file for a
same even if the LUN is mo
to
introduced in HP-UX 11i v3.
DSF
Device Special File. A file associated with an I/O device. DSFs are read and written the same as
ordinary files, but requests to read or write are sent to the associated device.
A ser
of I/O addresses that share a hierarchical relationship. The address elements m
physical hardware addresses, and mi
to it.
acy View
The representation of legacy hardware paths and legacy DSFs, as in releas
Legacy Hardware Path
The representation of a hardware path as it e
“0/2/1/0.1.4.0.0.2.7” is an example of a legacy hardware path.
Legac
A DSF with the hardware path information such as SCSI bus, target, and LUN embed
N
A SCSI logical unit. This
lo
Lunpath