B |
|---|
| block | | A unit of space for data on a disk, typically having
a size of 1024-bytes.
|
|---|
D |
|---|
| Dirty Region Logging | | Dirty Region Logging (DRL) is an optional property
of a volume, used to provide a speedy recovery of mirrored volumes
after a system failure. DRL keeps track of the regions that have changed
due to I/O writes to a mirrored volume.
|
|---|
F |
|---|
| file system | | The organization of files on storage devices. The
term file system can refer either to the entire file system or to
a subsection of that file system, contained within a disk section
or a logical volume that can be mounted or unmounted from that tree.
|
|---|
L |
|---|
| LIF | | The Logical Interchange Format (LIF) is a HP mass-storage
format that can be used for interchange of files among various HP
computer systems. Each boot disk has a LIF directory that contains
boot programs.
|
|---|
| logical Extent | | A set of logical blocks that maps to one physical
extent and is a basic unit of access in a logical volume.
|
|---|
| logical volume | | A logical structure that is a map of storage areas
on physical volumes. A logical volume can be conceptualized as a
storage device of flexible size. The data in a logical volume can
be mapped to one or more physical volumes. A virtual disk device
that represents a contiguous virtual disk space that maps to single
or multiple areas on a single or multiple physical volumes.
|
|---|
| LVM | | The Logical Volume Manager (LVM) is a subsystem
for managing disk space. LVM is an HP-UX product, similar to VxVM.
|
|---|
M |
|---|
| Mirror Write Cache (MWC) | | A MirrorDisk/UX mechanism whose use is optional,
that tracks outstanding mirror write requests and provides a basis
for the resynchronization of data blocks after a system crash.
|
|---|
| MirrorDisk/UX | | HP-UX software product that allows disk mirroring
as part of LVM functionality. MirrorDisk/UX allows up 2 mirror copies
in a volume.
|
|---|
P |
|---|
| physical extent | | A set of physical disk blocks on a physical volume
that forms a basic unit of access in LVM. This also forms the allocation
unit for logical volumes.
|
|---|
| physical volume | | A disk that has been initialized by LVM becomes known
as a physical volume.
|
|---|
| private region | | A region of a physical disk used to store private, structured
VxVM information. The private region contains a disk header, a table of contents, and
a configuration database. The table of contents maps the contents
of the disk.
|
|---|
| public region | | A region of a physical disk managed by VxVM that contains
available space and is used for allocating subdisks.
|
|---|
S |
|---|
| set of continuous physical extents [PEs] | | Set of physical sectors (blocks) contained within
a single physical volume. A physical extent is a specific, contiguous
region of the disk where data resides. This is of a constant size
usually of 4 MB and has no partitions.
|
|---|
| snapshot | | A temporary extra copy (plex/mirror) created in
a volume. A separate volume is created once its contents are brought
in sync with the original volume.
|
|---|
V |
|---|
| volume group | | The collective identity of a set of physical volumes, which
provide disk storage for the logical volumes. A set of physical volumes
whose space can be combined and logically divided up into logical
volumes. Only logical volumes and physical volumes that are a part
of a volume group can map together, a physical volume can belong
to only one volume group.
|
|---|
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