Should I Verify eatch copy & Transfuring to multiple HDs at same time

Anything and everything to do with DCP-o-matic.
funkytwig
Posts: 72
Joined: Mon Jul 28, 2014 9:37 am

Should I Verify eatch copy & Transfuring to multiple HDs at same time

Post by funkytwig »

I've just been asked to make 8 NTFS DCPs of a 2.5-hour feature. I generally load the DCP using the DCP Player and od a verify but the last bit takes a while x 8. Is it necessary or can I replay on just loading to test.

Also is there a util to easily copy a folder onto multiple HDs at the same time? This would be very usefull.
Carsten
Posts: 2804
Joined: Tue Apr 15, 2014 9:11 pm
Location: Germany

Re: Should I Verify eatch copy & Transfuring to multiple HDs at same time

Post by Carsten »

There are dedicated tools for multiple copies, but the time needed to find them and read the documentation is usually not worth the effort for a single use. Mostly these are command line utilities, usually running in linux.
If you have your original DCP on an internal fast SSD, just issue multiple manual copies to as many discs as you can connect simultaneously. This is not a good idea if your source is located on a spinning disc. In theory, caching should improve multiple read throughput even on spinning discs, but the result in my experience does not live up to expectations.

In Windows, you could try N2Ncopy. I haven't tested it so far. It may be an easy GUI app for parellel copies, but I don't know wether it performs multiple target copies more efficiently than plain multiple manual OS type copying.

You should probably dig up an older version of DCP-o-matic player (e.g. 2.14.x), so only the hash check is performed on the copies, not the additional time consuming tests introduced with 2.16. Only hash checking is needed to confirm transfer integrity. A full verification is only recommended for the source files.
macuser
Posts: 11
Joined: Mon Mar 10, 2014 4:28 pm
Location: Switzerland

Re: Should I Verify eatch copy & Transfuring to multiple HDs at same time

Post by macuser »

Hello everybody,

might be an unusual workflow but I have done that in the past:

Take the first copy from the master dcp, copy that copy onto the next HDD, now take this 'new' copy and copy that on the next HDD and so on until you reach the last HDD. Now you have to verify only the last copy and if that copy is OK all other copy's must be OK too!

Kind regards
Max