HP CIFS Client A.02.01 Administrator's Guide

Configuration File
Configuration Parameters
Chapter 7108
This strategy derives the NFS file handle as a hash
value from the path. The hash is chosen in a way
that makes efficient lookups possible, as long as the
depth of the file in the directory hierarchy is lower
than 27. The advantage of this strategy is the low
memory consumption: Files can be looked up on
demand, nothing has to be stored. The main
disadvantage is that NFS file handles change when
files are renamed. This leads to a conflict with Unix
semantics when open files are renamed: After
renaming, the handle of the open file is stale and
the file can not be accessed without reopening. It
also conflicts with a bug in the caching code of the
Solaris NFS client where the writeback occurs only
after closing the file, not during closing the file.
• database
In this strategy all NFS file handle to file path
relations are stored in an internal database. This is
the most secure and most compatible approach.
The disadvantage is that all this information must
be kept in memory. The HP CIFS Client needs
about 500kB more real memory and about 10MB
more virtual memory for each share that uses this
strategy.
The database strategy is the default.
nfsTimeout This integer variable defines the initial timeout in 1/10
seconds that is used by the kernel when it requests
data from HP CIFS Client. This value is doubled on
each retry. Together with nfsRetransmit, this defines
the absolute timeout for NFS requests. A value of 50 (5
seconds) avoids frequent retries of already running
(slow) requests and ensures a total timeout of about 2
minutes. This should be sufficient even for the slowest
devices and links. If you use a jukebox, it may also be
necessary to increase requestTimeout.
nfsRetransmit This integer variable defines the number of retries the
kernel attempts when HP CIFS Client does not reply in
time. The timeout starts with nfsTimeout and is
doubled on each retry. Retransmissions should not be
necessary, because HP CIFS Client should not lose any