nfsserver.conf

The file /opt/mapr/conf/nfsserver.conf controls parameters related to MapR services and the warden. Most of the parameters are not intended to be edited directly by users. The following table shows the parameters of interest:

Parameter	Default Value	Description
Compression	`true`	Indicates whether compression is on (`true`) or off (`false`).
`ChunkSize`	`67108864`	Size of each chunk. Default is 64M.
`CompThreads`	`2`	Number of threads for compression or decompression.
`RamfsMntDir`	`/ramfs/mapr`	Mount point for the `ramfs` file for `mmap`.
`RamfsSize`	`0.25`	Size of the ramfile to use (percent of total physical memory). If set to 0, disables the use of ramfs.
`Loglevel`	`INFO`	Sets the level of log messages displayed in the output. Levels include: DEBUG INFO WARN ERROR CRITICAL OFF
`DrCacheSize`	`20480`	Duplicate request cache size.
`DrCacheTimeout`	`62`	Duplicate request cache timeout in seconds.
`DRCacheTimeOutOpt`	`0.5`	If the operations take more than `DrCacheTimeout * DRCacheTimeOutOpt`, the operations will not be cached. For example, by default, if the operation takes more than 31 seconds — `(.5 * 62) = 31` seconds — the operation is not cached. It can be disabled by setting value to `0`.
`MaxLogFileSize`	1024 MB	The maximum amount of disk space that the NFS server logs can consume before the oldest log file is deleted, based on the following calculation: `maxSizePerLogFile = maxLogFileSize / MAX_NUM_OF_LOG_FILES` where: `maxLogFileSize` is the total amount of space that NFS server log files may consume `MAX_NUM_OF_LOG_FILES` is the total number of NFS server log files Logrotate support for both the `.log` and the `.err` files honor this setting. ATTENTION: `MaxLogFileSize` is not a combined size of `.log` and `.err` files. The `.log` and `.err` files can individually grow up to this size.
`MinLenForDeserialization`	`8192`	Deserialize (if value is > 0) or do not deserialize (if value = 0) the response in the compression thread. If value is greater than 0, MapR deserializes requests with length >= value in the compression thread. If value is 0, requests of length < value are deserialized in the RPC thread itself.

The contents of the nfsserver.conf file are shown below.

# Configuration for nfsserver
#
# The system defaults are in the comments
#
# Default compression is true
#Compression = true
 
# chunksize is 64M
#ChunkSize = 67108864
 
# Number of threads for compression/decompression: default=2
#CompThreads = 2
 
#Mount point for the ramfs file for mmap
#RamfsMntDir = /ramfs/mapr
 
# Size of the ramfile to use (percent of total physical memory) default=0.25
#    0: disables the use of ramfs
#RamfsSize = 0.25
 
# Loglevel = DEBUG | INFO | WARN | ERROR | CRITICAL | OFF
#Loglevel = INFO
 
#Duplicate Request cache size & timeout in seconds
#DrCacheSize = 20480
#DrCacheTimeout = 62
# To keep the drcache lean, we only cache the response if the
# time we took to populate is greater than 50% of DrCacheTimeout.
# Set it to 0 to disable this optimization, Note that the DrCacheSize or
# DrCacheTimeout will also need to be changed. Ex: if the nfsserver supports
# 10,000 ops/sec (modification ops): then DrCacheSize will need to change
# to: 10,000*DrCacheTimeout = 620,000
#DRCacheTimeOutOpt = 0.5
 
#NFS fileid, by default the fileid is of 32 bit size.
#Set Use32BitFileId=0 to use 64 bit fileid (inode number)
#Use32BitFileId=0
 
#Auto refresh exports time interval in mins.
#default is 0, means there is no auto refresh.
#AutoRefreshExportsTimeInterval = 5
MinLenForDeserialization=8192