Hi,
Created a zpool with 64k recordsize and enabled dedupe on it.
zpool create -O recordsize=64k TestPool device1
zfs set dedup=on TestPool
I copied files onto this pool over nfs from a windows client.
Here is the output of zpool list
Prompt:~# zpool list
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
TestPool 696G 19.1G 677G 2% 1.13x ONLINE -
When I ran a "dir /s" command on the share from a windows client cmd, I see the
file size as 51,193,782,290 bytes. The alloc size reported by zpool along with
the DEDUP of 1.13x does not addup to 51,193,782,290 bytes.
According to the DEDUP (Dedupe ratio) the amount of data copied is 21.58G
(19.1G * 1.13)
Here is the output from zdb -DD
Prompt:~# zdb -DD TestPool
DDT-sha256-zap-duplicate: 33536 entries, size 272 on disk, 140 in core
DDT-sha256-zap-unique: 278241 entries, size 274 on disk, 142 in core
DDT histogram (aggregated over all DDTs):
bucket allocated referenced
______ ______________________________ ______________________________
refcnt blocks LSIZE PSIZE DSIZE blocks LSIZE PSIZE DSIZE
------ ------ ----- ----- ----- ------ ----- ----- -----
1 272K 17.0G 17.0G 17.0G 272K 17.0G 17.0G 17.0G
2 32.7K 2.05G 2.05G 2.05G 65.6K 4.10G 4.10G 4.10G
4 15 960K 960K 960K 71 4.44M 4.44M 4.44M
8 4 256K 256K 256K 53 3.31M 3.31M 3.31M
16 1 64K 64K 64K 16 1M 1M 1M
512 1 64K 64K 64K 854 53.4M 53.4M 53.4M
1K 1 64K 64K 64K 1.08K 69.1M 69.1M 69.1M
4K 1 64K 64K 64K 5.33K 341M 341M 341M
Total 304K 19.0G 19.0G 19.0G 345K 21.5G 21.5G 21.5G
dedup = 1.13, compress = 1.00, copies = 1.00, dedup * compress / copies = 1.13
Am I missing something?
Your inputs are much appritiated.
Thanks,
Giri
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