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Chapter 6 HPSS Configuration
HPSS Installation Guide September 2002 327
Release 4.5, Revision 2
Storage Class Statistics
Interval
An interval in seconds that
indicates how often the
BFS needs to contact each
SS to get up-to-date
statistics on each storage
class that the SS manages.
This information is used in
load balancing across
multiple storage classes.
Any positive 32-bit integer value. 180
Advice: For systems with mostly disk or small files, the number should be set to a
short interval (between 30 and 60 seconds). For systems with mostly large or tape
files, this value should be set higher (e.g., 1 to 5 minutes).
Class of Service Change
Retry Limit
Max number of times a
COS change ‘retry
forever’ is processed on a
bitfile before the request to
change the COS of the
bitfile is rejected.
0 - (2
(32)
-1)
0
Note: A SIGUSR1 signal can be sent to the Bitfile Server to toggle emptying the
COS change file and thus rejecting all COS changes. When BFS is initialized, it is
set up to honor all COS change requests. If you send a SIGUSR1 signal to BFS, it
will then delete all COS change file requests that are placed in the COS change file,
until a second SIGUSR1 signal is sent which will reinstate the default behavior of
honoring COS change requests. When the signal is sent, a message will appear in
the Alarms and Events window which will indicate the new status. This feature
should be used very carefully!
The default value of 0 tells the BFS to retry indefinitely.
Table 6-16 Bitfile Server Configuration Variables (Continued)
Display Field Name Description Acceptable Values
Default
Value