I've a interesting situation. I've created two pool now and one pool named "Data" and another named "raid5". Check the details here:

bash-3.00# zpool list
NAME                    SIZE    USED   AVAIL    CAP  HEALTH     ALTROOT
Data                   10.7T   9.82T    892G    91%  ONLINE     -
raid5                  10.9T    145K   10.9T     0%  ONLINE     -

As you see, the sizes are approximately the same. If I run the df command, it reports:

bash-3.00# df -h /Data
Filesystem             size   used  avail capacity  Mounted on
Data                    11T   108M   154G     1%    /Data
bash-3.00# df -h /raid5
Filesystem             size   used  avail capacity  Mounted on
raid5                  8.9T    40K   8.9T     1%    /raid5

You see that the Data has 11 TB when zpool reported 10.7 TB and the raid5 has 10.9TB in zpool but only 8.9 TB when using df. Thats a difference of 2 TB. Where did they go?

Any explanation would be find.

Regards,

Lars-Gunnar Persson
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