12-10-2008
Determine space on a disk
Hello, I am trying to understand how to calculate actual disk space on a logical volume. Based on the output below, how would I convert the total and free PPs to MB and GB? Thank you.
HTML Code:
# lsvg rootvg
VOLUME GROUP: rootvg VG IDENTIFIER: 000a8dac00004c00000000fca4046498
VG STATE: active PP SIZE: 128 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 1092 (139776 megabytes)
MAX LVs: 256 FREE PPs: 307 (39296 megabytes)
LVs: 18 USED PPs: 785 (100480 megabytes)
OPEN LVs: 17 QUORUM: 1
TOTAL PVs: 2 VG DESCRIPTORS: 3
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 2 AUTO ON: yes
MAX PPs per VG: 32512
MAX PPs per PV: 1016 MAX PVs: 32
LTG size: 128 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY: relocatable
# lsvg -p rootvg
rootvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk0 active 546 232 11..00..03..109..109
hdisk3 active 546 75 15..00..02..00..58
David
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LEARN ABOUT HPUX
prealloc
prealloc(1) General Commands Manual prealloc(1)
NAME
prealloc - preallocate disk storage
SYNOPSIS
name size
DESCRIPTION
preallocates at least size bytes of disk space for an ordinary file name, creating the file if name does not already exist. The space is
allocated in an implementation-dependent fashion for fast sequential reads and writes of the file.
fails and no disk space is allocated if name already exists and is not an ordinary file of zero length, if insufficient space is left on
disk, or if size exceeds the maximum file size or the file size limit of the process (see ulimit(2)). The file is zero-filled.
DIAGNOSTICS
returns one of the following values upon completion:
0 Successful completion.
1 name already exists and is not an ordinary file of zero length.
2 There is insufficient room on the disk.
3 size exceeds file size limits.
EXAMPLES
The following example preallocates 50000 bytes for the file
WARNINGS
Allocation of file space is highly dependent on current disk usage. A successful return does not indicate how fragmented the file actually
might be if the disk is approaching its capacity.
AUTHOR
was developed by HP.
SEE ALSO
prealloc(2), ulimit(2).
prealloc(1)