Long-time maintenance of Hammer2 on HDD

Justin Sherrill justin at shiningsilence.com
Sat Nov 9 09:47:55 PST 2019

synth is here:


dsynth is in DragonFly:


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.

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