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Topic: Need another reason to watch your movies before showing them to customers?
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Marcel Birgelen
Film God
Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012
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posted 09-04-2017 07:59 AM
Hollywood just has no clue about day to day operations. You can't just dump some content somewhere and expect it to play flawlessly the first run.
Regarding those RAID glitches. It is pretty unfortunate they still need to happen. Seemingly only the most expensive storage systems know how to handle those kind of situations. In case a RAID array with parity, instead of waiting for the lagging disk to return the data, the controller or software RAID should immediately reconstruct it from parity data and flag the affected sector for further inspection during a background operation. Once too many of those time-outs on a single disk occur, it should flag that disk for replacement, before permanent failure occurs. That way, the playback can continue uninterrupted and the operator gets informed about possible issues with a disk.
Like I indicated, those systems do exist, but are usually reserved for enterprise grade storage appliances. Apparently, cinema equipment isn't deemed to be "enterprise grade".
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Marcel Birgelen
Film God
Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012
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posted 09-04-2017 05:29 PM
The problem here is that off-the-shelf RAID systems are usually more tuned to data consistency than to continuous throughput.
For normal business and database applications, you don't want to give up on a disk, just because of an occasional timeout. A timeout could be caused by the disk remapping a bad sector to a spare one, for example.
If this would've been a normal business application, the impact would be rather minimal, maybe you'd experience a few seconds of non-responsiveness. But for real-time applications, like the streaming of a movie for playout, those hiccups can be killing.
To fix this, the manufacturers like Dolby/GDC/etc. would need to alter the RAID implementation or replace those off-the-shelf solutions with one of those expensive storage manufacturers. Obviously they're not really keen on doing that, it's also not really their core business anyway.
You can already see where it's heading though. Integrated Media Servers are becoming the norm now for new installs, they usually don't have a lot of on-board storage. So, handling storage the "correct" way will become the responsibility of your NAS supplier.
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