Since a week, I'm testing backup on a powerful server (32G RAM / 4 CPU).
I do a full backup on weekends and incremental every day of the week.
Why my dedup rate is so low?
[root@Bacula fs01]# zdb -DD bacula
DDT-sha256-zap-unique: 17612028 entries, size 295 on disk, 154 in core
DDT histogram (aggregated over all DDTs):
bucket allocated referenced
______ ______________________________ ______________________________
refcnt blocks LSIZE PSIZE DSIZE blocks LSIZE PSIZE DSIZE
------ ------ ----- ----- ----- ------ ----- ----- -----
1 16.8M 2.10T 1.95T 1.95T 16.8M 2.10T 1.95T 1.95T
Total 16.8M 2.10T 1.95T 1.95T 16.8M 2.10T 1.95T 1.95T
dedup = 1.00, compress = 1.07, copies = 1.00, dedup * compress / copies =
1.07
[root@Bacula fs01]# zpool iostat
capacity operations bandwidth
pool alloc free read write read write
---------- ----- ----- ----- ----- ----- -----
bacula 1,96T 1021G 133 55 3,54M 4,27M
Best regards
Antoine
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