Dedup was introduced in NAS 5.6.43.8, which version are you using?

Jonathan,

from command line run:

nas_fs -info

output will look something like this:

id = 23
name = fs01
acl = 0
in_use = True
type = uxfs
worm = off
volume = v98
pool = clarata_archive
member_of = root_avm_fs_group_10
rw_servers= server_2
ro_servers=
rw_vdms = secure
ro_vdms =
auto_ext = hwm=90%,max_size=1258291M,virtual_provision=no
deduplication = On
stor_devs = APM00084902216-000D,APM00084902216-000C
disks = d16,d12
disk=d16 stor_dev=APM00084901234-000D addr=c16t1l9 server=server_2
disk=d16 stor_dev=APM00084901234-000D addr=c0t1l9 server=server_2
disk=d12 stor_dev=APM00084901234-000C addr=c0t1l5 server=server_2
disk=d12 stor_dev=APM00084901234-000C addr=c16t1l5 server=server_2

Its on the properties page of the filesystem

I have already looked on this page and there is no mention of deduplication.

Version running is 5.6.41.2. How do you go about upgrading ?

Open a SR and ask for an uograde because you want to use dedup