HP 3000 Manuals

Performing System Management Tasks

Managing Permanent and Transient Storage 

Use VOLUTIL, the disk management utility, to allocate permanent storage
and transient storage on system volumes.  The NEWVOL command configures
permanent and transient storage on system volumes, and ALTERVOL changes
the allocation.

   *   Permanent storage is disk space used on both system and nonsystem
       volumes for permanent structures such as files (permanent and
       temporary), the label table, and the free space map.  Permanent
       structures are those that do not need to be re-created when the
       system is rebooted.  Nonsystem volumes may use only permanent
       storage.

   *   Transient storage is used on system volumes for structures such as
       virtual memory and other temporary operating system data
       structures.  Transient structures need to be re-created when the
       system is rebooted.

In the figure below, permanent storage is visualized as filling in from
the bottom toward its maximum.  Transient storage is visualized in the
figure as filling in from the top toward its maximum.


          Figure 9-6.  Permanent and Transient Storage 

In this figure, permanent and transient storage is limited to 75 percent
of the total storage space.  Permanent storage already occupies 20
percent of the total, and transient storage fills 50 percent.  Permanent
storage theoretically could take up another 55 percent, but only 30
percent of the total storage space remains free.  So, permanent storage
is limited to 30 percent more.  Transient storage can take up another 25
percent.  In this case, 5 percent of the space would remain free.


NOTE  You should always configure nonsystem volumes at 100 percent
      permanent, which is the default.  Since the system does not put
      transient objects on nonsystem volumes, any transient storage that
      is configured cannot be used.


To configure disk storage 

Use the NEWVOL command to configure disk storage.  For example, to
configure 65 percent permanent storage and 65 percent transient storage
on the system volume MEMBER4, enter:

     volutil:NEWVOL VNAME=MPEXL_SYSTEM_VOLUME_SET:MEMBER4 PERM=65 TRANS=65 


NOTE  The operating system limits the changes that can be made to
      transient storage space on LDEV 1, the system master volume.  It is
      not recommended that transient space be modified for LDEV 1, but if
      you must do so, plan carefully.  For LDEV1, the default value for
      transient space is 75 percent and the default value for permanent
      storage is 75 percent.


To change the disk storage 

Use the ALTERVOL command to change the permanent and transient disk space
allocation for a particular volume.

To use ALTERVOL, at the volutil:  prompt, enter:

     volutil:ALTERVOL sname:vname percentperm percenttrans 

ALTERVOL has the following parameters:

ALTERVOL {[VNAME] = sname:vname} [[PERM] = percentperm]

[[TRANS] = percenttrans]

For example, to change the permanent and transient storage allocation on
the volume SAMPLE_VOL in the volume set SAMPLE_SET to 100 percent, enter:

     volutil:ALTERVOL SAMPLE_SET:SAMPLE_VOL 100 100 

MPE/iX 5.0 Documentation