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QNAP TS-253A: 2x 3TB, Raid 1 = 1TB "storage"?

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I'm confused...

I have 2x 3TB WD Red drives installed into a QNAP TS-253A. During initial setup, I stuck to the defaults presented - including Raid1, 20% "snapshot" space, and did not perform "bad sector" check.

Upon completion, I am only seeing 1TB of space available - I was expecting in the neighborhood of 3TB. Even 2.5 - but a paltry 1TB?

df -h reports the following, on Ext4 filesystem:

[~] # df -h
Filesystem                Size      Used Available Use% Mounted on
none                    200.0M    177.3M     22.7M  89% /
devtmpfs                  1.9G      8.0k      1.9G   0% /dev
tmpfs                    64.0M    328.0k     63.7M   1% /tmp
tmpfs                     1.9G         0      1.9G   0% /dev/shm
tmpfs                    16.0M         0     16.0M   0% /share
cgroup_root               1.9G         0      1.9G   0% /sys/fs/cgroup
/dev/md9                493.5M    105.3M    388.1M  21% /mnt/HDA_ROOT
/dev/md13               355.0M    275.1M     79.9M  77% /mnt/ext
/dev/mapper/cachedev1     1.0T     16.1G      1.0T   2% /share/CACHEDEV1_DATA
tmpfs                     1.0M         0      1.0M   0% /mnt/rf/nd

Am I doing something wrong? Am I being impatient? (the activity lights on the unit for the HDDs are going nuts, though the system health check reports "totally fine").

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