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