Long-time maintenance of Hammer2 on HDD

[Justin Sherrill]

synth is here:

https://github.com/jrmarino/synth

dsynth is in DragonFly:

https://gitweb.dragonflybsd.org/dragonfly.git/tree/HEAD:/usr.bin/dsynth

But I don't think either is doing any Hammer-specific actions.  My
note was that just using the filesystem doesn't seem to cause problems
over time.

On Fri, Nov 8, 2019 at 10:29 PM Mikhail Novosyolov
<m.novosyolov at rosalinux.ru> wrote:
>
> Are those scripts available in public? It would be interesting to look
> at examples how Hammer snapshots are managed.
>
> 08.11.2019 20:28, Justin Sherrill пишет:
> > For what it's worth, the many, many bulk builds of dports using
> > poudriere and synth and dsynth are happening on hammer/hammer2 disks,
> > and to my knowledge, there has been no degradation over time.
> >
> > On Thu, Nov 7, 2019 at 5:18 PM Mikhail Novosyolov
> > <m.novosyolov at rosalinux.ru> wrote:
> >> As far as I understand, Hammer2 was designed mainly for flash memory (SSD, NVMe).
> >>
> >> Currently I am using it on a 2 TB HDD.
> >>
> >> Imagine that a lot of files and snapshots are created and deleted and there are multiple MySQL databases there.
> >>
> >> How will Hammer2 consistency and performance degrade over time in this use case?
> >>
> >> Did not find information about HDDs and defragmentation in sys/fs/Hammer2/DESIGN.