Re: SDD puzzle -- *maybe* solved

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Anno domini 2021 Fri, 20 Aug 15:16:02 +0000
 dep scripsit:
> said Dr. Nikolaus Klepp:
> | Anno domini 2021 Fri, 20 Aug 13:40:03 +0000
> |
> |  dep scripsit:
> 
> | > If it boots reliably from sdc1, as it does now, why would I want to do
> | > that?
> |
> | Good question :) Let's call it habit. When you have more than one
> | computer with more than one harddrive and each of them may or may not be
> | able to boot from each harddive it's good to ensure that each machine
> | can boot from the first device on sata1, otherwise you start cursing
> | your younger self for beeing such a moron playing the
> | find-the-boot-drive-guess-game with your older self.
> 
> I have this thing on my hard drives called GRUB that presents upon reboot a
> selection from which I can choose.<g> And I'm not running a computer farm
> here -- keeping track of which is which is pretty easy.
> 
> | > | And get rid of the old OS on sda1 :)
> | >
> | > I may not have been clear as to my purpose. The OS on sda1 is
> | > *identical* to the one on the SSD, sdc1. I hope to take advantage of
> | > the improved speed of the SSD, but I do not utterly trust SSDs (nor
> | > hard drives, but I come closer to trusting those). By having both,
> | > should the SSD fail I can simply boot an identical system by making
> | > that choice in the GRUB menu. So in this case it really is a feature,
> | > not a bug.
> |
> | Sure. But why not put that (old) sda in cold storage? In your scenario
> | you won't need it till things get "interesting". Or do you plan to keep
> | both devices in sync? e.g. do any config twice, repeate any os upgrade?
> 
> There are several reasons. The first is that the machine would be limited
> in its usefulness without a /home directory, which resides on the 6tb
> sda1. Yes, I coupld move cables around, after which I could also spend
> hours changing links that rely currently on it being on sda1 and on the
> other drives that rely on their being where they currently are.

Ah, ok, I somehow missed the part with /home still on sda1 ... sounds like a good reason to keep that drive :)

Nik

> And yes, I do intend to keep them in sync, which simply requires booting to
> the hard drive once every couple of weeks and doing an #apt update and
> upgrade. Most configurations I need to do are in userspace, and in that
> both boot partitions point to the same ~/, the configurations will work on
> either one. The switch to SSD for daily use as / is a calculated tradeoff
> of reliability for speed, and maintaining a boot partition on sda1 -- as
> you note, the default for most everybody -- is a way of mitigating the
> risk. In that I'm often on deadline, the ability to keep going despite an
> SSD failure and dealing with a failed SSD at my later convenience is
> preferable to going to cold storage and taking the computer apart, then
> updating the Linux onboard, before I can do what I need to do right now.
> That was my design and, with the help of you and others here, I've been
> able to achieve it. (The problem at the top of this thread, it's now
> pretty clear, was due to the BIOS being . . . awful.)
> 
> And I don't do a full OS upgrade all that often, every couple of years at
> most. I used to get all excited and burn every new kernel that Linus
> released -- I remember the exciting Christmas of 2000, which I spent
> building and testing a release candidate for 2.4.0 (and which I didn't
> mind -- the inlaws were visiting) -- but I haven't done that for many
> years. Though having a machine like the one I have now would have made
> that easier, because I'd have a pretty easy out when the damned new kernel
> blew up!
> --
> dep
> 
> Pictures: http://www.ipernity.com/doc/depscribe/album
> Column: https://ofb.biz/author/dep/
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