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| Required configuration for SmartIO writeback caching for a VxFS file system | ||
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| Required configuration for SmartIO writeback caching for a VxFS file system | ||
|---|---|---|
| Prev | About SmartIO writeback caching for applications running on VxFS file systems | Next |
You must have an Enterprise license to use SmartIO with writeback caching for Storage Foundation or Storage Foundation High Availability.
You can set up SmartIO for writeback caching for a VxFS file system with the following configurations:
A Storage Foundation Cluster File System High Availability (SFCFSHA) cluster with exactly 2 nodes. Writeback caching is not enabled if the cluster has more than 2 nodes. If another node is added while writeback caching is configured, writeback caching is disabled. Caching continues in read mode.
If the cluster file system is unmounted on one of the two nodes while writeback caching is configured, then writeback caching is disabled. Caching continues in read mode. If the cluster file system on the second node is remounted, then writeback caching is enabled automatically.
Local mount configuration.
In the case of CFS, writeback caching uses LLT transport to mirror the writeback data. Application writes that are cached are also written to the remote cache before the write is returned. Symantec recommends that you configure LLT over RDMA to avoid impact to the throughput.
For information on configuring LLT, see the Symantec Storage Foundation Cluster File System High Availability Installation Guide.
The file system must have the following characteristics: