On Feb 21, 2010, at 6:40 PM, Andrey Kuzmin wrote: > I don't see why this couldn't be extended beyond metadata (+1 for the > idea): if zvol is compressed, ARC/L2ARC could store compressed data. > The gain is apparent: if user has compression enabled for the volume, > he/she expects volume's data to be compressable at good ratio, > yielding significant reduction of ARC memory footprint/L2ARC usable > capacity boost.
I think something similar was discussed by Jeff and Bill in the ZFS keynote as KCA, Just-in-time decompression. Keeping prefetched data in memory but without decompressing it. I'll guess you would want the data decompressed it it's going to be used, at least frequently. The also discussed that unused data in the ARC might be able to be compressed in the future. Henrik http://sparcv9.blogspot.com
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