After searching for dm-crypt and ZFS on Linux and finding too little
information, I shall ask here. Please keep in mind this in the context of
running this in a production environment.

We have the need to encypt our data, approximately 30TB on three ZFS
volumes under Solaris 10. The volumes currently reside on iscsi sans
connected via 10Gb/s ethernet. We have tested Solaris 11 with ZFS encrypted
volumes and found the performance to be very poor and have an open bug
report with Oracle.

We are a Linux shop and since performance is so poor and still no
resolution, we are considering ZFS on Linux with dm-crypt.
I have read once or twice that if we implemented ZFS + dm-crypt we would
loose features, however which features are not specified.
We currently mirror the volumes across identical iscsi sans with ZFS and we
use hourly ZFS snapshots to update our DR site.

Which features of ZFS are lost if we use dm-crypt? My guess would be they
are related to raidz but unsure.
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