Re: How to use dmsetuup?
On 11/5/23 01:46, David Christensen wrote:
On 11/4/23 21:05, gene heskett wrote:
On 11/4/23 23:15, David Christensen wrote:
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)
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.
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
.
Amanda is now been able the use big disk storage for a couple decades,
separate from the computers main drive. These disks then contain
tarball, compressed if possible, that can be read on a rebuilt machine
with a bare metal install for recovery. One must be fam with how it
works, and w/o its database but it can be done. I'm also into 3d
printers, and that has made me fam with the arm64 sbc cards such as the
bananapi-m5 which has 4 ub3 ports on a 2GHz 4 core cpu. Startech makes a
usb3 to sata adapter that can do 500M/sec to an SSD. I am doing it on an
rpi4b. So I am tempted to build my own NAS by using all 4 of those
ports to hook 4 of these 2T gigastones up as a 4G raid10. Run it
headless by an ssh login, setup amanda server on it, setup amanda-client
on the rest, setup amanda to do any compression on the clients which are
fast enough to do it and let the pi handle the actual storage, including
its database which makes a recovery a matter to telling it which file
and how old. I normally setup for 60 to 90 days of retention. It won't
be fast but it will be isolated from anything that fails on the rest of
my net,
Fast is relative, running on an older mobo in this machines original
incarnation, it backed up itself and 4 other machines on my local net in
30 to 45 minute sessions everynight. Using a separate drive, but that
drive, one of two 2T seagates went off line forever at about 6 weeks
runtime, followed 3 days later by its twin which was the boot drive in
this machine, leading to a 22 install disaster because the installer at
the time was or still is busted.
Buster and bullseye both worked great, bookworm has been a disaster from
the gitgo for me. I absolutely own every byte of /home/gene, but
something is getting in the way that didn't for buster or bullseye, and
I have a hard time believing I am the only one on the planet with such a
problem. The evidence says I am. opening a write requester to select
where the file is to be put takes from 30 seconds to 5 minutes, once its
drawn on screen, things are instant. Where is that delay? And better
yet, how do I fix it?
I can recall, 35 years ago, running os9 on a trs-80 color computer, a
mini unix at the time that could run on a 64k machine, would get laggy
when the floppy disk was getting full because it was scanning the file
allocation table for open space, but those lags weren't anything like
this. Is the sheer size of the system creating a similar problem?
So my first experiment will be to move /home off the raid to a single 2T
SSD. Unfortunately my partner for the last 34 years in the crime of
marriage has passed, so I don't have anyone to tell, "here, hold my beer
and watch this". ;o)>
I just gotta get off my bum and do it. At 89 yo, my body doesn't always
want to do what my brain tells it to. Next project is finding the bottom
of a rafter and drilling a hole to drive a screw eye into the ceiling so
I can pick an 81 lb 3d printer up, swing it over a table and set it
down. Hopefully yet today. I've drug in everything but the stepladder to
drill the hole and install the skyhook.
Thanks all.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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