Resending as my previous email didn`t get through the list. Can someone please advice how we can improve compression ratio here? Thanks!
---------- Forwarded message ---------- From: Krishna PMV <[email protected]> Date: Fri, Oct 28, 2011 at 10:41 AM Subject: poor zfs compression ratio To: [email protected] Hey, We are trying to backup our emails by copying (via rsync) them to a different storage server where we have recently installed openindiana[1] so we can take advantage of inbuilt compression and deduplication features of zfs but to our surprise, the compression ratio seem to be pretty low. We ran different tests as follows[2] but none of them were anywhere close to vanilla compression (with gzip command) of mdbox ( dovecot`s own mailbox format) files themselves or dovecot`s inbuilt compression[3] . Any ideas how we could improve zfs`s compression ratio here? Thanks! [1] uname -a SunOS backup-us1 5.11 oi_148 i86pc i386 i86pc Solaris [2]. a) default compression (=lzjb) and dedup=on zfs get compressratio tank/testingdeduponfromjr1 NAME PROPERTY VALUE SOURCE tank/testingdeduponfromjr1 compressratio 1.13x - b) default compression (=lzjb) and dedup=off zfs get compressratio tank/testingdedupofffromjr1 NAME PROPERTY VALUE SOURCE tank/testingdedupofffromjr1 compressratio 1.12x - c) compression=gzip(=gzip6) and dedup=on zfs get compressratio tank/testingdeduponandgzipfromjr1 NAME PROPERTY VALUE SOURCE tank/testingdeduponandgzipfromjr1 compressratio 1.61x - d) compression=gzip-9 and dedup=on zfs get compressratio tank/testingdedupoffandgzip9fromjr1 NAME PROPERTY VALUE SOURCE tank/testingdedupoffandgzip9fromjr1 compressratio 1.66x - 3) http://wiki2.dovecot.org/Plugins/Zlib _______________________________________________ OpenIndiana-discuss mailing list [email protected] http://openindiana.org/mailman/listinfo/openindiana-discuss
