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Digest Name: monthly HP-UX technical tips digest
    Created: Sun Jul 15 3:10:03 PDT 2001

Table of Contents:

Document ID Title
--------------- -----------
3200070937 SYS ADM: How to create Swap or Dump logical volumes

The documents are listed below.
-------------------------------------------------------------------------------


Document ID: 3200070937
Date Loaded: 20010704
      Title: SYS ADM: How to create Swap or Dump logical volumes

PROBLEM

Please describe how to create swap or dump logical volumes
on an HP-UX 11.0 computer.

CONFIGURATION

Operating System - HP-UX
Version - 11.0
Subsystem - SYS ADM

RESOLUTION

To create a dump logical volume, do the following:

     Note: The dump devices have to be part of vg00.

     1. Create a contiguous logical volume inside vg00 with bad
         block reallocation turned off:

         lvcreate -C y -r n /dev/vg00

     2. Turn on the dump device for the logical volume just
         created:

         lvlnboot -d /dev/vg00/lvolX

To create a swap logical volume, do the following:

     Note: The swap and dump can be created on the same logical
            volumes. The swap devices do not need to be part of
            vg00, but they can be.

     1. Create a contiguous logical volume:

         lvcreate -C y /dev/vgX

     2. Turn swap on in the logical volume:

         swapon /dev/vgX/lvolY

     IMPORTANT: The default priority for swap is "1". It is a
                 recommended to have all the swap devices set to
                 the same priority.

     3. Edit the /etc/fstab so that swap will be turned on at
         boot-up; add the following line:

         /dev/vgX/lvolY ... swap defaults 0 2

     NOTE: If you want to remove swap or change the priority of
            swap, then it is necessary to edit the /etc/fstab and
            then reboot the system.

The difference between file system swap and device swap is as
follows:

File system swap:

    o can be configured dynamically.

    o allows a process to use an existing file system if it
       needs more than the designated device swap space.

    o is used only when device swap space is insufficient to
       meet demand-paging needs.

    o consumes a variable amount of space because it only uses
       that portion of a file system that it needs.

Once a file system has been enabled for file system swap, it is
not possible to unmount that file system until the swap is
disabled at the next reboot. It is possible to limit file system
swap to a fixed size to prevent it from consuming too much space.

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-----End of Document ID: 3200070937------------------------------------------

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