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Topic: What would cause a jitter?

David Buckley
Jedi Master Film Handler

Posts: 525
From: Oxford, N. Canterbury, New Zealand
Registered: Aug 2004

posted 02-03-2015 03:24 PM

quote: Steve Guttag
...you'll get a clunker of a disc and the others in the same batch will run seemingly forever.

And sometimes an entire batch of disks all start failing at about the same time...

Not too bad in a cinema context, lose a couple of shows, yeah, that's really annoying, but when several disks in a big array with business information go bad almost simultaneously and take the array out, it can be very ugly...

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Marcel Birgelen
Film God

Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012

posted 02-03-2015 07:09 PM

That's why it's a good idea to mix batches of disks. I even advocate mixing suppliers or series for anything "business critical". Unfortunately, many hardware storage solutions are still picky in accepting disks from multiple vendors, if sector sizes don't match up.

Also, RAID-5 might still be mostly fine for a single screen, but with ever-increasing disk sizes, it's even becoming a liability in those kinds of applications.

For DCI, future playout systems should have better I/O monitoring and reporting per disk, just like many modern SAN systems already have. Such monitoring could identify and tackle defective disk issues rather easily and much more reliable than stuff like SMART. But since we seem to steadily move to some sort of centralized storage / NAS solution, often done with cheapo hardware, I expect throughput and other I/O related issues to become ever more common in the future.

Also, once every projector is hooked to some central storage, you will now not only lose one auditorium once stuff goes haywire, but all the other rooms as well.

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