Re: [PLUG] Is it possible to move data from a SAS drive to the newly installed SSD?

[Rich Freeman via plug <plug@lists.phillylinux.org>]

On Mon, Jan 18, 2021 at 4:33 PM H Mottaleb <h_mottaleb@yahoo.com> wrote:
>
> How about I re-install everything except the Eth1 chain. Would it be possible to copy over just the /var/lib/goetherium volume?
>

That is what I would do.  It wouldn't actually be very difficult.  The
hard part is trying to explain exactly how to do it.

Simplest way would be just to mount the old partition and copy the
files over, preserving permissions on them (cp -a would work).  I'm
not sure if anybody wants to take a stab at that.

If you can set up the new drive and boot from it, the old partition
should be available under /dev/ubuntu-vg/geth.  You should be able to
do something like:

mkdir /mnt/old
mount /dev/ubuntu-vg/geth /mnt/old
cp -a /mnt/old/* /var/lib/goetherium/
umount /mnt/old

Of course, you'd need to be careful to not wipe out your old
partitions when you install ubuntu on the new drive.  (Granted if you
do it just costs you a few days to re-download it all.)  I'm not sure
what ubuntu does if it sees an existing volume group called ubuntu-vg
either.  You'll need to have enough space on root to store those
files, and since your drive is likely going to be smaller now you'll
need to be careful about fragmenting it, so we might deal with that
problem differently from before.

This stuff isn't too hard to do, but it is a bit tricky to do over
email.  If you want to try creating a new host you can again post the
output of df -h, lvs, pvs, vgs, blkid so that we can see what is going
on.

If this is a different host you could potentially just copy the files
over the network.  That isn't too hard, but will happen at network
speed (for hundreds of gigabytes it can take hours even on 1Gb
ethernet), and it requires setting up ssh which will also be tricky
over email...

I'm sure this must all be frustrating.  Usually we try to get people
who are new to linux to do stuff like install a desktop distro and
play around with browsers, text editors, and so on.  Generally you're
not messing around with hardware RAID, LVM, unpackaged services, and
so forth on day one...

Rich


--
Rich
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