On 11/4/23 21:05, gene heskett wrote:
On 11/4/23 23:15, David Christensen wrote:Shudder. Anything mechanical can be destroyed by a smoke particle 100x to small to be seen with a good eye. I am a CET & Electronics in general I understand the physics of, and in electronics the only thing moving is a few electrons here or there. As long as the voltage does not force an electron thru the oxide layer that is the capacitors insulation, forming a leakage path that avalanches thru the oxide film and essentially destroys the device, there is no physical reason that it will not continue to do its jobs for hundreds or thousands of years. It will be external environmental effects that will eventually reach the chip and byproducts of the humidity let in by the breach of the package sealing that finally destroys it.On 11/4/23 17:55, gene heskett wrote:FWIW the rw's I have and that continue to work, are Sony DVD+RW, well over 5 years old now. I understand there is a DVD-RW but I've no experience with them. Today my objection is the size. In comparison to a system driving 3d printers with gcode from Cura-5.4 that is not rolled up into subroutine loops, I have some of the more complex and large parts part files that will not fit on a dvd. So it simply impractical for me to back up to a measly 4.7Gig dvd.That's why they invented Blu-ray: https://en.wikipedia.org/wiki/Blu-ray 25 GB (single-layer) 50, 66 GB (dual-layer) 100, 128 GB (BDXL)The size of a bit that is detectable on a disk is determined by the wavelegth of the light reading that bit, cd's were designed with the IR lasers of the day, which emmit light in the 1100 nanometer range. Far infrared IOW. DVD's were made possible with a shorter visible light laser, then blue rays got that down to abut 400 nanometers. The next gen of those will have a uv laser but we'll have to invent it first. But part of that problem is that decent optical glass for the lenses does not pass UV to a usable amount. Plastic lets it blast on thru but can we make plastic lenses that precisely for the price bleeding edge users will pay? IDK.
Interesting tangent.The point I was trying to make is that proper disaster preparedness involves defenses in depth. AFAIK your data and your backups are on the same computer and you have no other recent backups or archives. If true, then, as you already know, the computer is a single point of failure that could destroy both data and backups.
And, now you are touching HBA's, touching drives, and issuing root commands that are in direct proximity to your data and backups. As you already know, human error is the most common failure mode. I am worried that you are going to make a mistake and suffer a data disaster (partial or total). That is why I suggested that you give the Asus a rest and build a backup server now. If you then trash the Asus, recovery will be possible. A duplicate set of backups is wise in case something happens to the primary backups (notably, human error during recovery).
David