| --- |
| title: Optimizing a System with Disk Stores |
| --- |
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| |
| Optimize availability and performance by following the guidelines in this section. |
| |
| 1. <%=vars.product_name_long%> recommends the use of `ext4` filesystems when operating on Linux or Solaris platforms. The `ext4` filesystem supports preallocation, which benefits disk startup performance. If you are using `ext3` filesystems in latency-sensitive environments with high write throughput, you can improve disk startup performance by setting the `maxOplogSize` (see the `DiskStoreFactory.setMaxOplogSize`) to a value lower than the default 1 GB and by disabling preallocation by specifying the system property `gemfire.preAllocateDisk=false` upon <%=vars.product_name%> process startup. |
| 2. When you start your system, start all the members that have persistent regions at roughly the same time. Create and use startup scripts for consistency and completeness. |
| 3. Shut down your system using the gfsh `shutdown` command. This is an ordered shutdown that positions your disk stores for a faster startup. |
| 4. Configure critical usage thresholds (`disk-usage-warning-percentage` and `disk-usage-critical-percentage`) for the disk. By default, these are set to 80% for warning and 99% for errors that will shut down the cache. |
| 5. Decide on a file compaction policy and, if needed, develop procedures to monitor your files and execute regular compaction. |
| 6. Decide on a backup strategy for your disk stores and follow it. You can back up a running sytem by using the `backup disk-store` command. |
| 7. If you remove any persistent region or change its configuration while your disk store is offline, consider synchronizing the regions in your disk stores. |
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