This section is taken from IBM GPFS Tuning Parameters

Option 1: To view GPFS Configuration Parameters

# mmlsconfig

Configuration data for cluster nsd-nas:
----------------------------------------
myNodeConfigNumber 1
clusterName nsd1-nas
clusterId 111111111111
autoload yes
minReleaseLevel 3.4.0.7
dmapiFileHandleSize 32
maxMBpS 2000
maxblocksize 4m
pagepool 1000m
adminMode allToAll

File systems in cluster nsd1-nas:
---------------------------------
/dev/gpfs1

Option 2: Detailed Dump of configuration

# mmfsadm dump config

afmAsyncDelay 15
afmAtimeXattr 0
afmDirLookupRefreshInterval 60
afmDirOpenRefreshInterval 60
afmDisconnectTimeout 60
afmExpirationTimeout disable
afmFileLookupRefreshInterval 30
afmFileOpenRefreshInterval 30
afmLastPSnapId 0
afmMode 1
afmNumReadGWs 0
afmNumReadThreads 1
afmParallelReadChunkSize 134217728
afmParallelReadThreshold disable
afmReadBufferSize 33554432
afmReadPrefetchThreshold 2
.....
.....

Option 3: Change Configuration Parameters

# mmchconfig pagepool=256M

Use -i to make the change permanent and affect the running GPFS daemon immediately.
Use -I to affect the GPFS daemon only (reverts to saved settings on restart)

Parameters
(For more information, see GPFS Tuning Parameters)

leaseRecoveryWait
logfile size
GPFSCmdPortRange
maxBufferDescs
maxFilesToCache
maxMBpS
maxMissedPingTimeout
maxReceiverThreads
maxStatCache
minMissedPingTimeout
nfsPrefetchStrategy
nsdMaxWorkerThreads
numaMemoryInterleave
pagepool
opensslLibName
prefetchPct
prefetchThreads
readReplicaPolicy
seqDiscardThreshold
sharedMemLimit
socketMaxListenConnections
socketRcvBufferSize
socketSndBufferSize
verbsLibName
verbsrdmasperconnection
verbsrdmaspernode
worker1Threads
worker3Threads
writebehindThreshold