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The default is 'off'; the acceptable values are 'on' and 'off'. + compressionAlgorithm: + The algorithm used to compress data. The acceptable values are + 'lz4' and 'zstd'; the default for a new volume is 'lz4'. The + algorithm is recorded when the volume is formatted and cannot be + changed afterward. If specified when loading an existing volume, + it must match the recorded algorithm. + + compressionLevel: + The Zstd compression level. The default is 1; negative levels are + accepted when supported by the kernel Zstd implementation. This + option is invalid with LZ4. The level may be changed after fully + deactivating the volume, but not by reloading an active VDO table. + It does not affect the readability of data written at another level. + Device modification ------------------- @@ -178,6 +192,8 @@ A modified table may be loaded into a running, non-suspended vdo volume. The modifications will take effect when the device is next resumed. The modifiable parameters are , , , , and . +The parameter is a format-time property and is not +modifiable. If the logical device size or physical device size are changed, upon successful resume vdo will store the new values and require them on future @@ -255,7 +271,10 @@ The messages are: config: Outputs useful vdo configuration information. Mostly used by users who want to recreate a similar VDO volume and - want to know the creation configuration used. + want to know the creation configuration used. Output version + 3 contains physicalSize, logicalSize, slabSize, + compressionAlgorithm, the Zstd compressionLevel when applicable, + and index configuration fields. dump: Dumps many internal structures to the system log. This is -- 2.55.0