IBM Hub/Switch 2.10.3.2.8 Disk Space Requirements for Running NFS Daemon, 2.10.3.2.9 Disk Space Requirements for Running SSM

Chapter 2 HPSS Planning

134 September 2002 HPSS Installation Guide

Release 4.5, Revision 2

2.10.3.2.8 Disk Space Requirements for Running NFS Daemon

The HPSS NFS server memory and disk space requirements are largely determined by the

conﬁguration of the NFS request processing, attribute cache, and data cache. Data cache memory

requirementscan be estimated by multiplying the data cache buffer size by the number of memory

data cache buffers.

Attribute cache memory requirements can be estimated by combining requirements for directory

namewith ﬁle attribute memory requirements. The total number of name space objects kept in the

NFS attribute cache is determined by the maximum number of entries in the attribute cache least

recently used (LRU) list. A portion of these entries will be directories, and the rest will be bitﬁles,

symbolic links, or hard links.

Directory name memory requirements are determined by multiplying the estimated number of

cacheddirectories by the directory size conﬁguration. Estimating the number of cached directories

canbe done by multiplying the number of entries in the attribute cache LRU list by the percentage

of directories to ﬁles at the site. For example, if the LRU list maximum is set to 100 and the

percentageof directories at the site is 1 directory to 10 ﬁles (10%), the estimated number of cached

directories is 10.

File attribute memory requirements are determined by subtracting the number of cached

directoriesfrom the maximum number of entries on the LRU list and multiplying the result by 100.

Request processing memory requirements can be estimated by multiplying the number of ONC

remote procedure call threads by 65 KB.

The HPSS NFS Server requires disk storage for ﬁve UNIX ﬁles:

• Exports ﬁle—a text ﬁle that speciﬁes how NFS access is offered.

• Remotemount (rmtab) ﬁle—this ﬁle, in thesame directory as the exports ﬁle, is a text ﬁle

that identiﬁes what clients have mounted HPSS directories.

• Credentials map ﬁle—a text ﬁle that is used to checkpoint the NFS credentials map. The

credentials map ﬁle size will be based on the number of entries in the credentials map

cache.

• Checkpointﬁle—required by the data cache. The data cache checkpoint ﬁle size is related

to the number of cache entries, but is much smaller than the cache entry ﬁle.

• Entry ﬁle—required by the data cache. Disk storage for the data cache entry ﬁle is

determinedby multiplying the number of cache entries by the data cache buffer size. The

data cache entry ﬁle should be placed in its own disk partition to avoid disk contention.

2.10.3.2.9 Disk Space Requirements for Running SSM

IfSSM is conﬁgured to buffer alarm and event messages in a disk ﬁle, each SSM Data Server process

will require an alarm ﬁle approximately 5MB in size. This ﬁle may be placed wherever it is

convenient. There is normally only one Data Server process.