HP-UX Reference (11i v2 07/12) - 1M System Administration Commands N-Z (vol 4)

r
ramutil(1M) ramutil(1M)
NAME
ramutil - utility to create or destroy RAM disk volumes
SYNOPSIS
/usr/sbin/ramutil
[-l] -c -v volume_number
-s volume_size
/usr/sbin/ramutil -d -v
volume_number
/usr/sbin/ramutil -f
DESCRIPTION
The ramutil utility is used to create and destroy RAM disk volumes on the system. The system adminis-
tator must configure additional swap devices and also modify the
maxdsiz_64bit
tunable in order to
create large swappable RAM disk volumes.
Options
ramutil recognizes the following options:
-c Creates the RAM disk volume, the associated node, and the device special files.
The character device special file is created as /dev/rdsk/ram
volume_number. The block
device special file is created as
/dev/dsk/ram volume_number.
The
-v and -s options are mandatory with this option.
The -l option can be used with this option to create a nonswappable RAM disk.
-d Destroy the specified RAM disk volume if there are no applications running on it.
The -v option is mandatory with this option.
-f Recreate any missing RAM disk device special files.
-l Create nonswappable RAM disk. This option should be used with caution since it creates RAM
disk that reserves physical memory on the system equal to its size.
-s volume_size
Specify the size of the RAM disk volume to be created. The size parameter can be given in bytes,
kilobytes, or gigabytes. For bytes, specify the number; for kilobytes, append the number with a
k; for gigabytes, append the number with a g.
If the RAM disk volume size is greater than 64 KB and the volume size is not a multiple of 64
KB blocks, then the size of the RAM disk volume is rounded off to the next 64 KB block. If the
RAM disk volume size is greater than 4 GB and the volume size is not a multiple of 1 GB blocks,
then the size of the RAM disk volume is rounded off to the next 1 GB block.
-v volume_number
Associate a volume number with a RAM disk. Fifteen RAM disk volumes are supported on a sys-
tem. The volume number can be any number in the range of 1 to 14 (certain other volume
numbers are reserved).
EXAMPLES
Create a swappable RAM disk that has a size of 6 GB and volume number 3:
ramutil -c -v 3 -s 6g
Destroy the RAM disk with volume number 3:
ramutil -d -v 3
WARNINGS
HP-UX 11i v2 (11.23) Ramdisc version 1 has not been certified for use with HP’s Logical Volume Manager
(LVM) in mirrored configurations. HP does not support such configurations since there is a possibility of
data loss from a redundancy failure of a physical disk or disk interface component. Other LVM mirrored
configuration failure modes may exist that may further impact data integrity. Note: RAM disk data is not
persistent across system reboots.
HP disclaims all warranties, express or implied, including but not limited to the implied warranties of mer-
chantability, fitness for a particular purpose, and noninfringement, if you use HP-UX 11i v2 (11.23) Ram-
disc version 1 with LVM mirrored configurations, and you assume all responsibility for any problems result-
ing from such usage in these configurations.
HP-UX 11i Version 2: December 2007 Update − 1 − Hewlett-Packard Company 209