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Date:      Tue, 21 Apr 2020 12:41:59 +0700
From:      Victor Sudakov <vas@sibptus.ru>
To:        freebsd-questions@freebsd.org
Subject:   ZFS used space (mis)calculation?
Message-ID:  <20200421054159.GA99203@admin.sibptus.ru>

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Dear Colleagues,

How can it happen that the sum total of all space occupied by snapshots does
not equal USEDSNAP?

130+21.4+20.2+19.8=3D191.4, not 219G. Where are my missing 150G ?

Please look (a complete picture, nothing redacted):

# zfs list -t all -o space
NAME                                       AVAIL   USED  USEDSNAP  USEDDS  =
USEDREFRESERV  USEDCHILD
fastdrive                                   371G   784G       52K     23K  =
            0       784G
fastdrive@2020-04-17_00.05.00--5d              -    13K         -       -  =
            -          -
fastdrive@2020-04-17_12.05.00--5d              -      0         -       -  =
            -          -
fastdrive@2020-04-18_00.05.00--5d              -      0         -       -  =
            -          -
fastdrive@2020-04-18_12.05.00--5d              -      0         -       -  =
            -          -
fastdrive@2020-04-19_00.05.00--5d              -      0         -       -  =
            -          -
fastdrive@2020-04-19_12.05.00--5d              -      0         -       -  =
            -          -
fastdrive@2020-04-20_00.05.00--5d              -      0         -       -  =
            -          -
fastdrive@2020-04-20_12.05.00--5d              -      0         -       -  =
            -          -
fastdrive/pg_data                           371G   783G      219G    565G  =
            0          0
fastdrive/pg_data@2020-04-19_00.05.00--5d      -   130G         -       -  =
            -          -
fastdrive/pg_data@2020-04-19_12.05.00--5d      -  21.4G         -       -  =
            -          -
fastdrive/pg_data@2020-04-20_00.05.00--5d      -  20.2G         -       -  =
            -          -
fastdrive/pg_data@2020-04-20_12.05.00--5d      -  19.8G         -       -  =
            -          -



--=20
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
2:5005/49@fidonet http://vas.tomsk.ru/

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