Basic Installing and Configuring of GPFS Cluster (Part 2)


This is a continuation of Installing and configuring of GPFS Cluster (Part 1).

Step 4b: Verify License Settings (mmlslicense)

# mmlslicense
Summary information
---------------------
Number of nodes defined in the cluster:                         33
Number of nodes with server license designation:                 3
Number of nodes with client license designation:                30
Number of nodes still requiring server license designation:      0
Number of nodes still requiring client license designation:      0

Step 5a: Configure Cluster Settings

# mmchconfig maxMBps=2000,maxblocksize=4m,pagepool=2000m,autoload=yes,adminMode=allToAll
  • maxMBps specifies the limit of LAN bandwidth per node. To get peak rate, set it to approximately 2x the desired bandwidth. For InfiniBand QDR, maxMBps=6000 is recommended
  • maxblocksize specifies the maximum file-system blocksize. As the typical file-size and transaction-size are unknown, maxblocksize=4m is recommended
  • pagepool specifies the size of the GPFS cache. If you are using applications that display temporal locality, pagepool > 1G is recommended, otherwise, pagepool=1G is sufficient
  • autoload specifies whether the cluster should automatically load mmfsd when a node is rebooted
  • adminMode specifies whether all nodes allow passwordless root access (allToAll) or whether only a subset of the nodes allow passwordless root access (client).

Step 5b: Verify Cluster Settings

# mmlsconfig
Configuration data for cluster nsd1:
----------------------------------------
myNodeConfigNumber 1
clusterName nsd1-nas
clusterId 130000000000
autoload yes
minReleaseLevel 3.4.0.7
dmapiFileHandleSize 32
maxMBpS 2000
maxblocksize 4m
pagepool 1000m
adminMode allToAll

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

Step 6: Check the InfiniBand communication method and details using the ibstatus command

Infiniband device 'mlx4_0' port 1 status:

       default gid:     fe80:0000:0000:0000:0002:c903:0006:d403
        base lid:        0x2
        sm lid:          0x2
        state:           4: ACTIVE
        phys state:      5: LinkUp
        rate:            40 Gb/sec (4X QDR)        
        link_layer:      InfiniBand

Step 7 (if you are using RDMA): Change the GPFS configuration to ensure RDMA is used instead of IP over IB (double the performance)

# mmchconfig verbsRdma=enable,verbsPorts=mlx4_0/1
mmchconfig: Command successfully completed
mmchconfig: Propagating the cluster configuration data to all
affected nodes. This is an asynchronous process.

More Information

  1. Basic Installing and Configuring of GPFS Cluster (Part 1)
  2. Basic Installing and Configuring of GPFS Cluster (Part 2)
  3. Basic Installing and Configuring of GPFS Cluster (Part 3)
  4. Basic Installing and Configuring of GPFS Cluster (Part 4)
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