Re: [gentoo-user] [OT] SMR drives (WAS: cryptsetup close and device in use when it is not)

[Frank Steinmetzger]

Am Sun, Aug 01, 2021 at 11:46:02AM +0800 schrieb William Kenworthy:

> >> And you are storing several machines into a single repo? The docs say this
> >> is not supported officially. But I have one repo each for /, /home and data
> >> for both my PC and laptop. Using a wrapper script, I create snapshots that
> >> are named $HOSTNAME_$DATE in each repo.
> > Basicly yes: I use a once per hour snapshot of approximately 500Gib of
> > data on moosefs, plus borgbackups 3 times a day to individual repos on
> > moosefs for each host.  3 times a day, the latest snapshot is stuffed
> > into a borg repo on moosefs and the old  snapshots are deleted.  I
> > currently manually push all the repos into a borg repo on the USB3 SMR
> > drive once a day or so.
> >
> > 1. rsync (and cp etc.) are dismally slow on SMR - use where you have to,
> > avoid otherwise.
> >
>
> > forgot to mention
>
> 1a. borgbackup repos are not easily copy'able - each repo has a unique
> ID and copy'ing via rsync creates a duplicate, not a new repo with a new
> cache and metadata which depending on how you use can cause
> corruption/data loss.  Google it.

Yup. Today I did my (not so) weekly backup and rsynced the repo to the new
drive. After that I wanted to compare performance of my old 3 TB drive and
the new SMR one by deleting a snapshot from the repo on each drive. But Borg
objected on the second deletion, because “the cache was newer”. But that’s
okay. I actually like this, as this will prevent me from chaning two repos
in parallel which would make them incompatible.

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