# LustreReadCacheConfiguration


 The configuration for the optional provisioned SSD read cache on Amazon FSx for Lustre file systems that use the Intelligent-Tiering storage class. 

## Contents


 ** SizeGiB **   <a name="FSx-Type-LustreReadCacheConfiguration-SizeGiB"></a>
 Required if `SizingMode` is set to `USER_PROVISIONED`. Specifies the size of the file system's SSD read cache, in gibibytes (GiB).   
The SSD read cache size is distributed across provisioned file servers in your file system. Intelligent-Tiering file systems support a minimum of 32 GiB and maximum of 131072 GiB for SSD read cache size for every 4,000 MB/s of throughput capacity provisioned.  
Type: Integer  
Valid Range: Minimum value of 0. Maximum value of 2147483647.  
Required: No

 ** SizingMode **   <a name="FSx-Type-LustreReadCacheConfiguration-SizingMode"></a>
 Specifies how the provisioned SSD read cache is sized, as follows:   
+ Set to `NO_CACHE` if you do not want to use an SSD read cache with your Intelligent-Tiering file system.
+ Set to `USER_PROVISIONED` to specify the exact size of your SSD read cache.
+ Set to `PROPORTIONAL_TO_THROUGHPUT_CAPACITY` to have your SSD read cache automatically sized based on your throughput capacity.
Type: String  
Valid Values: `NO_CACHE | USER_PROVISIONED | PROPORTIONAL_TO_THROUGHPUT_CAPACITY`   
Required: No

## See Also


For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon SDK for C\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/fsx-2018-03-01/LustreReadCacheConfiguration) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/fsx-2018-03-01/LustreReadCacheConfiguration) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/fsx-2018-03-01/LustreReadCacheConfiguration)