TMF Planning and Configuration Guide (H06.05+)
Reconfiguring TMF Processes
HP NonStop TMF Planning and Configuration Guide—540136-002
6-8
Changing Process File Segment (PFS) Sizes
On systems with a large number of data volumes or a large number of files accessed
by a single transaction, the backout, volume recovery, or file recovery processes might
not be able to perform their recovery operations with the current memory allocation. In
relation to the default extended segment size, for example, 250 volumes could be
considered a large number of volumes. In such cases, you might need to increase the
extended segment size for these processes.
The default backout process extended segment size is (5,40). The default file recovery
or volume recovery process extended segment size is (40,40). Changing the
configured value for a recovery process requires manually stopping the process or a
STOP TMF operation.
Table 6-1 gives the recommended recovery process extended segment sizes for
various S-series systems.
For further sizing guidelines, contact your service provider.
Changing Process File Segment (PFS) Sizes
In the G06.00 and subsequent G-series release version updates (RVUs), you do not
need to specify the PFS size of a new process. If you do, the specification is ignored.
Instead, all processes have a PFS size that can grow up to 8 MB. Note that if you
include the PFSSIZE parameter in an ALTER PROCESS command, the specified
values must be correct even though they are ignored.
Table 6-1. Recommended Recovery Process Extended Segment Sizes
Number of Data
Volumes
Backout Extended
Segment Size
File/Volume Recovery
Extended Segment Size
1-199 (5,40) (40,40)
200-299 (5,50) (50,50)
For each additional
100 volumes add 10
MB to the maximum
segment size
(5,x) where x is 40 + (
(numvols - 200) / 10 )
(x,x) where x is 40 + (
(numvols - 200) / 10 )
Caution. Consider the operations and values described in the following discussion very
carefully, because the basis for them is subject to ongoing change. If such changes were
implemented in TMF since this manual was published with RVU G06.26, they will be described
in TMF Supplement for Limits and Defaults Changed After RVU G06.26. If that Supplement
currently exists, please read it for new information about this topic.