Lists the parameters for the MapR NFS server.
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 list
shows the parameters of interest:
- Compression
- Default Value:
true
- Description: Indicates whether compression is on (
true) or off
(false).
- ChunkSize
- Default Value:
67108864 bytes (64 MB)
- Description: Size of each chunk.
- CompThreads
- Default Value:
2
- Description: Number of threads for compression or decompression.
- DrCacheSize
- Default Value:
20480
- Description: Duplicate request cache size.
- DrCacheTimeout
- Default Value:
62 seconds
- Description: Duplicate request cache timeout in seconds.
- DRCacheTimeOutOpt
- Default Value:
0.5
- Description: If the operations take more than
DrCacheTimeout *
DRCacheTimeOutOpt, the operations are not cached. For example, by default, if
the operation takes more than 31 seconds — (62 * .5) = 31 seconds — the
operation is not cached. A value of 0 disables the cache.
- HighMemLimitMB
- Default Value:
disabled (Parameter is commented out in the
file)
- Description: The maximum amount of memory (in MB) that the NFS server process
can use. If the NFS server process uses more memory than this value, then the server is
automatically shutdown, and a Core file is generated for debugging.
For example:
HighMemLimitMB=10000 indicates that the NFS server is shutdown if
it consumes more than 10GB of memory.
This parameter is effective only if you
enable the MemDebugEnable parameter.
- LogLevel
- Default Value:
INFO
- Description: Sets the level of log messages displayed in the output. Levels
include:
- DEBUG
- INFO
- WARN
- ERROR
- CRITICAL
- OFF
- MaxLogFileSize
- Default Value:
1024 MB
- Description: 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 consumeMAX_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.
- MemDebugEnable
- Default Value:
false (Parameter is commented out in the
file)
- Description: Set this parameter to
true to enable memory
tracking for the NFS server. This parameter works along with the
HighMemLimitMB parameter.
- MinLenForDeserialization
- Default Value:
8192
- Description: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..
- RamfsMntDir
- Default Value:
/ramfs/mapr
- Description: Mount point for the
ramfs file for
mmap.
- RamfsSize
- Default Value:
0.25
- Description: Size of the ramfile to use (percent of total physical memory). A
value of
0 disables the use of ramfs.
- WindowsAceSupport
- Default Value:
false
- Description: Allow (
true) or deny (false)
access to a Windows client when ACEs are set. If true, the mode bits
are set to 777, the Windows client is granted access, and the operation
is allowed based on the permissions enforced using mode bits and/or ACEs. If value is
false, the mode bits are set to 000 and the Windows client is denied
access. For more information, see Mounting NFS on a Windows Client. TIP Use separate NFS servers for Windows clients and non-Windows
clients.