wiped disk - no longer bootable

[Liam Proven]

On Mon, 15 Jul 2019 at 12:48, compdoc <compdoc at hotrodpc.com> wrote:

> I don't use it either, which is why I don't know a lot about it. Way
> back when, lots of utilities that I used to repair system wouldn't work
> with it.

True.

> However, many have used LVM and encryption successfully for years, and
> the Ubuntu installer defaults to it for encryption. And lots of
> utilities will work with it now. Therefore, I have to declare it safe
> and sound

Oh, yes, I think it is. Overcomplex and difficult, but safe, sure.

The thing is,  if you only have 1 or even 2 disks, it really doesn't
give you anything useful.

Therefore, I can't agree with:

> and a reasonable choice.

I think that only applies if you're juggling enough drives to make not
just RAID viable, but RAID 6 or above.

RAID 0 (striping) and RAID 1 (mirroring) aren't true RAID. RAID 5 is
minimum 3 disks. RAID 6 is 2 parity disks -- an array can lose 2
drives and keep running -- and only works with 4+ drives. It's only
really worth doing with 5+ drives.

Which is where stuff starts to get complex. It needs effort to plan
and to implement.

If you are into that zone of complexity, then LVM pays back the effort.

OTOH, I would prefer something that integrates LVM into partitioning
and formatting. Such as XFS, or Stratis when it becomes stable and
mature enough.

There *was* something like that, called EVMS:

https://en.wikipedia.org/wiki/Enterprise_Volume_Management_System

But LVM was simpler at implementation level, so EVMS never made it
into the kernel. The EVMS team gracefully backed down.

The problem is that sometimes the thing that is simpler to implement
is more complex to use. This is called the "worse is better" approach
and all of *nix is a direct result of it:

https://www.jwz.org/doc/worse-is-better.html

> Its the using of a 500Gig drive as
> cache that's stupid when SSDs are so fast and reliable, and OSes and
> programs will cache intelligently for you these days.

Agreed. I would not use a word so strong as "stupid" but I don't see the point.

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