11.14.1 How to manage available space in the data storage (using only memory caches)

(a) Deleting unneeded data

Increase the available space in the data storage by deleting unneeded data.

(b) Adding EADS servers to the cluster

If enough space cannot be obtained from (a), add EADS servers to the cluster. Adding EADS servers to the cluster enables you to reduce the number of data items stored in each EADS server.

For details about how to add EADS servers to a cluster, see 11.1.1 How to add EADS servers to a cluster without stopping the cluster (scale-out processing) or 11.1.2 How to add EADS servers to a cluster after stopping the cluster (using only memory caches).

Note that because the total data restriction function is disabled during scale-out processing, sufficient space (at least twice the number of data items and capacity that are added during scale-out processing) is required.

(a) Check the storage that has reached the maximum amount of data that can be stored on EADS servers

Execute the eztool storeusage command to determine from the number of keys and amount of memory usage the storage that has reached the maximum amount of data that can be stored on EADS servers.

(b) Terminate all EADS servers in the cluster (after exporting data to files)

Export data to files and then terminate all EADS servers in the cluster.

For details about this procedure, see 10.5 Terminating the EADS servers (after exporting data from memory to files).

(c) Change the properties

Re-estimate the Java heap size and the explicit heap size, and then change the properties based on the estimation results. If necessary, add server machines and memory.

For details about how to estimate these values, see the following:

• Estimating the Java heap size

  4.1.2 Estimating the Java heap size

• Estimating the explicit heap size

  4.1.3 Estimating the explicit heap size

For details about how to change the properties, see 11.4 Changing the properties.