HP NonStop G-Series - Manual (Page 59)

Configuring and Managing SMF Processes
HP NonStop Storage Management Foundation User's Guide—523562-008
3-9
Managing SMF
Conversely, if you do not want co-location, you can spread data across the entire pool
with RESTORE by omitting the PHYSVOL option and allowing SMF to choose the file
locations. If you later find that certain files are not located correctly, you can use the
FUP RELOCATE command to move them to a new location within the pool.
When using SMF to migrate data to newer, larger disks, it is important to avoid head
contention. If several files containing frequently accessed data formerly located on
separate disks are all placed on the same large disk, performance degrades. Such files
should be spread across all the disks in the pool. You can also use your knowledge of
data access patterns to distribute the data. Suppose the data is stored by date and you
must produce reports that do year-to-year comparisons. If each month's data is on a
different volume than the data from 12 months earlier, you will avoid head contention.
Managing SMF
All SMF processes run as privileged, multithreaded process pairs. Only one $ZSMS
process pair executes on any node, but multiple storage pool and virtual disk
processes can execute on a system. Each storage pool process manages one storage
pool, and each virtual disk process is associated with a particular storage pool. This
subsection summarizes operations using COUP and PUP and SCF to define and
manage SMF processes and their associated storage pools.
Starting SMF Processes
Before defining storage pools and virtual disks or starting the processes that manage
them, $ZSMS must be configured and started. As
Figure 3-2 indicates, you use the
COUP START PROCESS command for D-series versions, or the SCF START MON
command for G-series versions, to start $ZSMS.
Storage pool processes and virtual disk processes that have been configured are also
started by using the COUP START command for D-series versions, or the SCF START
command for G-series versions.
After it is started, an SMF process is automatically restarted whenever the primary
processor in which it runs is loaded or reloaded.
Figure 3-2. Starting $ZSMS
005 CDT .CDD
DSC/COUP or SCF
COUP command: START PROCESS $ZSMS
$ZSMS
SCF command: START MON $ZSMS