With Pivotal GemFire disk stores, you can persist data to disk as a backup to your
in-memory copy and overflow data to disk when memory use gets too high.
How Disk Stores Work
The overflow feature uses disk stores as an extension of the in-memory cache. Persistence uses disk stores to store a redundant copy of the data.
Disk Store File Names and Extensions
Disk store files include store management files, access control files, and the operation log, or oplog, files, consisting of one file for deletions and another for all other operations.
Disk Store Operation Logs
At creation, each operation log is initialized at the disk store's max-oplog-size, with the size divided between the crf and drf files. When the oplog is closed, Pivotal GemFire shrinks the files to the space used in each file.
Configuring Disk Stores
In addition to the disk stores you specify, Pivotal GemFire has a default disk store that it uses when disk use is configured with no disk store name specified. You can modify default disk store behavior.
Disk Store Management
The gfsh command-line tool has a number of options for examining and managing your disk stores. The gfsh tool, the cache.xml file and the DiskStore APIs are your management tools for online and offline disk stores.