Richard Elling <richard.ell...@gmail.com> writes: > On Feb 8, 2010, at 6:04 PM, Kjetil Torgrim Homme wrote: >> the size of [a DDT] entry is much larger: >> >> | From: Mertol Ozyoney <mertol.ozyo...@sun.com> >> | >> | Approximately it's 150 bytes per individual block. > > "zdb -D poolname" will provide details on the DDT size. FWIW, I have a > pool with 52M DDT entries and the DDT is around 26GB.
wow, that's much larger than Mertol's estimate: 500 bytes per block. > $ pfexec zdb -D tank > DDT-sha256-zap-duplicate: 19725 entries, size 270 on disk, 153 in core > DDT-sha256-zap-unique: 52284055 entries, size 284 on disk, 159 in core > > dedup = 1.00, compress = 1.00, copies = 1.00, dedup * compress / copies = > 1.00 how do you calculate the 26 GB size from this? -- Kjetil T. Homme Redpill Linpro AS - Changing the game _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
