MPE/iX Intrinsics Reference Manual (32650-90875)

Chapter 8 463
Command Definitions (HPMERGEEND-LOGSTATUS)
HPVOLINFO
Function = MPE/iX, MPE V: DSTAT
Returns the volume set name corresponding to the passed LDEV. An
LDEV can be associated with only one volume set. This item is a character
array and must be specified with a length of 32 bytes.
13 Logical device number
Returns the logical device number of the specified volume. This item
returns a 16-bit signed integer containing the logical device number.
On MPE/iX, mirrored disks maintain identical copies of the same
information on two disks. Information is returned for only one of the disks.
Which is returned is random.
14 & 15 Volume capacity
Function = MPE/iX: VOLUTIL command
Returns the volume capacity.
Item 14 returns a 64-bit signed integer containing the volume capacity in
sectors. Item 15 returns the capacity as a 64-bit real.
When the specifier is 1 or 4, the volume capacity consists of the capacity of
the volume whose LDEV or volume name was specified.
When the specifier is 2 or 3, the capacity of the volumes that make up the
volume set or class are totalled. This total value is returned.
16 & 17 Total MPE overhead
Returns the total MPE overhead, which consists of everything on a volume
that is not set aside for file space use. This is the volume space used for
operating system purposes.
Item 16 returns a 64-bit signed integer containing the total MPE
overhead. Item 17 returns the overhead as a 64-bit real.
Files that compose the code for the operating system are not included in
this overhead. Some of the space that is considered overhead includes:
MPE V - volume label, virtual memory, directory, defective tracks/sectors
table, initial segments, disk coldload information table, volume table, free
space map, and channel programs.
MPE/iX - volume label, file label table, directory, volume set information
table, free space map, transient space, and transaction management
overhead.
A subset of the overhead is returned through
itemnum s 18 through 29:
18 & 19 - MPE transient space
20 & 21 - MPE/iX configured transient space
22 & 23 - MPE V virtual memory
24 & 25 - Directory
26 & 27 - MPE/iX file label tables
28 & 29 - MPE/iX transaction management