Hi,
I'd like to compress quite well compressable (~4x) data on a file server using ZFS compression, and still get good transfer speed. The users are transferring several GB of data (typically, 8-10 GB). The host is a X4150 with 16 GB of RAM. Looking at ZFS layer described at http://www.opensolaris.org/os/community/zfs/source/ , it seems that the ZIL can play this role, as it is able to store the data uncompressed on a disk before passing the data to ZIO for the compression and the transfer to the final drives.
Fortunately, I got two idle drives in the server that I can use as log devices for my data pool. Unfortunately, it has no effect on write performances, so I guess I was wrong in thinking that the ZIL can cache the data before compression.
So is it possible to use the ZIL cache the data before compression? Did I miss an option somewhere?
Thanks! Gaëtan -- Gaëtan Lehmann Biologie du Développement et de la Reproduction INRA de Jouy-en-Josas (France) tel: +33 1 34 65 29 66 fax: 01 34 65 29 09 http://voxel.jouy.inra.fr http://www.itk.org http://www.mandriva.org http://www.bepo.fr
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