Unbalance and Zero'ing multiple drives at once?

[danimal86]

Now that i've finally got my parity drives all upgraded to WD Gold 16tb and am clearing my last 14tb drive (it was a parity drive at one point, now a data drive), i'm wanting to remove two 2tb & two 3tb drives out of the array.  I've already removed 2 drives using the Unbalance -> zero'ing script ->new config method....doing this one at a time.  

 

My question:

is it safe to use unbalance multiple to move data off the drives at the same time?  If i select "From" the 4 drives to be removed and "To" the 4 14tb drives, will it bottle neck down like crazy? 

 

With the zero'ing, i think the 2tb drives i did took around 4-5hrs, can i set 4 drives to do the zero'ing and then let it run overnight and hopefully be able to use plex the following morning? 

[itimpi]

The chances are that if you start multiple array operations at the same time you will get contention for the drives which slows them down and that the elapsed time could easily be more than doing them one at a time.

[danimal86]

34 minutes ago, itimpi said:

The chances are that if you start multiple array operations at the same time you will get contention for the drives which slows them down and that the elapsed time could easily be more than doing them one at a time.

One at a time it is.

Thanks!