HP NonStop G-Series - Manual (Page 57)

Configuring and Managing SMF Processes
HP NonStop Storage Management Foundation User's Guide—523562-008
3-7
Considerations for Data
reasons. In some cases, leaving data directly accessible can reduce the overall size
and resource requirements of the SMF configuration.
The total number of virtual disks needed to manage a large amount of data depends
on the size of the drives used inside a storage pool. The G06 and later product
versions of SMF support the creation of format 2 files. Under SMF, each partition
requires a virtual disk process. Therefore, the size of each partition depends on the
free space available on the drive in a storage pool on which the virtual disk is
configured.
Data that must be left directly accessible due to SMF restrictions includes:

$SYSTEM files

Swap files

TMF audit trail files

DSM/SCM files

OSS file systems

Data that must be accessible from OSS through its /G interface. This restriction
does not apply for H06.26, J06.15, or later RVUs.

Data that must be network accessible from a remote system running a version of
the operating system prior to D38

Files with large labels that cannot be converted (see Expanding File Labels on
page 4-6)
Data that should be left directly accessible for performance or operational reasons
includes:

Program files where application start-up time is critical

Data that must be backed up by using volume mode backup (see Section 7, File
Protection and Recovery for Virtual Disks )
Data can also be left directly accessed to reduce the overall size of the SMF
configuration. For example, a 500 GB SQL table must be split into partitions of no more
than 2 GB each, resulting in 250 partitions. Under SMF, each partition requires a virtual
disk process. If only 8 CPUs are available for SMF use, more than 30 VDPs per CPU
will have to be configured. This number can be reduced by leaving one partition per
disk directly accessed. Further, if the system uses 8 GB drives, four SQL partitions can
be placed on each drive. If one of these partitions remains directly accessed, the
number of VDPs will be reduced by 25 percent. Another alternative to reduce the
overall size of the SMF configuration is to identify disks full of static data and leave
them directly accessed.