> From: Richard Elling [mailto:rich...@nexenta.com] > > 4% seems to be a pretty good SWAG.
Is the above "4%" wrong, or am I wrong? Suppose 200bytes to 400bytes, per 128Kbyte block ... 200/131072 = 0.0015 = 0.15% 400/131072 = 0.003 = 0.3% which would mean for 100G unique data = 153M to 312M ram. Around 3G ram for 1Tb unique data, assuming default 128K block Next question: Correct me if I'm wrong, if you have a lot of duplicated data, then dedup increases the probability of arc/ram cache hit. So dedup allows you to stretch your disk, and also stretch your ram cache. Which also benefits performance. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
