FSS works with SmartIO to provide caching services for nodes that do not have local SSD devices.
In this scenario, Flexible Storage Sharing (FSS) exports SSDs from nodes that have a local SSD. FSS then creates a pool of the exported SSDs in the cluster. From this shared pool, a cache area is created for each node in the cluster. Each cache area is accessible only to that particular node for which it is created. The cache area can be of type, VxVM or VxFS.
The cluster must be a CVM cluster.
The volume layout of the cache area on remote SSDs follows the simple stripe layout, not the default FSS allocation policy of mirroring across host. If the caching operation degrades performance on a particular volume, then caching is disabled for that particular volume. The volumes that are used to create cache areas must be created on disk groups with disk group version 200 or later. However, data volumes that are created on disk groups with disk group version 190 or later can access the cache area created on FSS exported devices.
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CFS write-back caching is not supported for cache areas created on remote SSDs. |
For more information, see the document Veritas InfoScale SmartIO for Solid State Drives Solutions Guide.
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