Create a Storage Node Pool

Once you have created your Administration process, you can create a Storage Node Pool. This pool is used to contain all the Storage Nodes in your data store. A Storage Node pool is used for resource distribution when creating or modifying a data store. You use the pool create command to create this pool, then you join Storage Nodes to the pool using the pool join command.

Note that a default pool called AllStorageNodes will be created automatically and all SNs will be added to it during the topology deployment process. Therefore, the pool commands are optional if you use the AllStorageNodes pool as the default pool during deployment. You may have multiple kinds of Storage Nodes in different zones that vary by processor type, speed and/or disk capacity. So the Storage Node pool lets you define a logical grouping of Storage Nodes by whatever specification you pick.

Note:

This section is only to demonstrate how to explicitly create a Storage Node pool. Skip this section if you want to use the default pool AllStorageNodes during the topology deployment process.

Remember that you already have a Storage Node created. You did that in the previous step where you used the deploy-sn command to deploy the Storage Node. Therefore, after you add the pool, you can immediately join that first Storage Node to the pool.

The pool create command only requires you to provide the name of the pool.

The pool join command requires the name of the pool to which you want to join the Storage Node, and the Storage Node's ID. You can obtain the Storage Node's ID using the show topology command.

For example:

kv-> pool create -name BostonPool

Output:

Added pool BostonPool

kv-> show topology

Output:

store=mystore  numPartitions=0 sequence=2
zn: id=zn1 name=Boston repFactor=1 type=PRIMARY 
allowArbiters=false masterAffinity=false
sn=[sn1] zn:[id=zn1 name=Boston] <hostname>:5000 capacity=1 RUNNING

kv-> pool join -name BostonPool -sn sn1

Output:

Added Storage Node(s) [sn1] to pool BostonPool