Re: [PLUG] How to Store Video Files for 25 Years?

[Steve Litt <slitt@troubleshooters.com>]

On Fri, 7 Dec 2018 14:02:14 -0500
Rich Freeman <r-plug@thefreemanclan.net> wrote:

> On Fri, Dec 7, 2018 at 1:31 PM Keith C. Perry
> <kperry@daotechnologies.com> wrote:
> > I strongly recommend RAID 10 because its easy to upgrade mirror
> > sets.  To be clear and avoid storage arguments, what I am
> > recommending in whatever you do, is mirroring so you have more that
> > one complete set of your archives.  
> 
> While RAID might be a component of this, I want to urge some caution
> with relying solely on conventional RAID1/10 implementations.  Most do
> not handle silent data corruptions, and if you're talking 25 years I
> would not count on those not happening.

That's a good point. And like you mention later in this email, some
reliable way of checksumming is necessary. I don't have ZFS, so what I
do on backups is .tgz all the files, use a tar command to verify that
the tarball data matches the disk data, then perform an md5sum on the
tarball, and put the md5sum, in a file, on every optical disk
containing the tarball. That way, 100 years from now, assuming my great
great great great granddaughter can mount my Blu-ray and decipher
a .tgz, she can simply md5sum the tarball, match it to the md5sum file,
and know right away whether the tarball is accurate.

My experience tells me that if you record on good optical media and
store in climate controlled dark, whole tarballs are usually 100%
accurate after 10 to 15 years. I have no data on longer periods.
 
SteveT

Steve Litt 
December 2018 featured book: Rapid Learning for the 21st Century
http://www.troubleshooters.com/rl21
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