I agree with Tim.  Honestly it seems that the KB article has the wrong command listed, or maybe just not enough info listed about using said command.  I imagine if you were to add a disk count that would put the aggr over 16TB then the command in the KB might work. 

Here is a test from my lab box where the check was performed.

FAS3270A> priv set advanced
Warning: These advanced commands are potentially dangerous; use
         them only when directed to do so by NetApp
         personnel.
FAS3270A*>
FAS3270A*>
FAS3270A*> aggr 64bit-upgrade start aggrtest -mode check
Checking for additional space required to upgrade all writable 32-bit
volumes in aggregate aggrtest (Ctrl-C to interrupt)......

Upgrading a volume to 64-bit consumes additional free space in the volume. The
following table shows the space usage after each volume is upgraded to 64-bit:

Volume Name             Total          Used           Available      Capacity
-----------             -----          ----           ---------      --------
 voltest                100MB          5448KB         94MB           5%

To initiate the 64-bit upgrade of aggregate aggrtest, run this
command with the "normal", "grow-reserved", or "grow-all" option.

If you use the "grow-reserved" or "grow-all" option, volume sizes
will be increased automatically as needed during the upgrade.

If I ran the commands from the KB I got the same output you did.  Running the command as seen above was the only way I could get the check to run.

-Brad

On Tue, May 23, 2017 at 11:15 PM, tmac <tmacmd@gmail.com> wrote:

what about this:

priv set advanced

aggr 64bit-upgrade start Aggr1 

or 

aggr 64bit-upgrade start Aggr1 -mode check

--tmac

Tim McCarthy, Principal Consultant

Proud Member of the #NetAppATeam

I Blog at TMACsRack

On Tue, May 23, 2017 at 9:54 PM, Iluhes <iluhes@yahoo.com> wrote:

Tim,

Thanks for fast response

     online          raid_dp, aggr         nosnap=on, raidsize=11

                                32-bit  

On Tuesday, May 23, 2017 8:18 PM, tmac <tmacmd@gmail.com> wrote:

Is the volume already 64-bit? Maybe it is being ignored because it is already 64-bit?

--tmac

Tim McCarthy, Principal Consultant

Proud Member of the #NetAppATeam

I Blog at TMACsRack

On Tue, May 23, 2017 at 8:40 PM, Iluhes <iluhes@yahoo.com> wrote:

Hi Folks,

NetApp Release 8.2.4P6 7-Mode

Running 

#aggr add Aggr1 -64bit-upgrade check

aggr add: Neither a count of disks nor a list of disks to add

to the aggregate was specified.

Running with # of disk seem to be also not running check

#aggr add Aggr1 -64bit-upgrade check 6 

Note: preparing to add 4 data disks and 2 parity disks.

Continue? ([y]es, [n]o, or [p]review RAID layout) p

Is "check" no longer an option in 8.2.4?

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