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Chapter 6 HPSS Configuration
364 September 2002 HPSS Installation Guide
Release 4.5, Revision 2
Expire Credentials A flag that indicates
whether the credentials
map entries will be expired
and removed based on the
grace and purge intervals.
ON,
OFF
ON
Header Cache. The following fields are used to cache names and attributes of the HPSS file objects.
Class of Service The name of the COS used
when creating the NFS
files.
Any configured COS name from
the pop-up list.
First
configured
COS name
found in the
SFS file.
Advice: The hierarchy associated with this COS should have disk at its top storage
level.
Table Entries The number of entries in a
hash table used to hold
cached attributes for HPSS
bitfiles, directories, and
symbolic links.
Any positive 32-bit integer value. 97
Advice: This value should be set to a prime number greater than or equal to the
number of HPSS objects used through NFS at any one time.
LRU Maximum Length The maximum number of
HPSS objects to cache.
Any positive 32-bit integer value. 300
Advice: This value should be equal to the number of HPSS objects in use through
NFS for a period specified by the hold time. Generally, this value should not be
greater than three times the number of table entries.
Hold Time The interval, in seconds,
for which cached attributes
remain valid.
Any positive 32-bit integer value. 99
Advice: Smaller hold times reduce the effectiveness of the cache; larger hold times
result in attributes not being updated as often.
Directory Size The size of the cache for
directory name entries.
Any positive 32-bit integer value. 1024
Advice: This value should be based on average file size (fsize) and the average
number of files (fnum). The value = 4(44 + fsize) * fnum.
Disk and Memory Data Cache. The following fields are used by the NFS Daemon to cache bitfile data.
Table 6-28 NFS Daemon Configuration Variables (Continued)
Display Field Name Description Acceptable Values
Default
Value