[pve-devel] ZFS alternatives

[Michael Bellerue]

Online expansion was recently added to OpenZFS for RAID-Z.

https://www.freebsdfoundation.org/blog/openzfs-raid-z-online-expansion-project-announcement/


On Sun, Feb 25, 2018 at 6:47 AM, Gandalf Corvotempesta <
gandalf.corvotempesta at gmail.com> wrote:

> I do that quite often.
> Starting with a small number of expansive disks (like SSDs or NVMEs) and
> being able to expand on the fly when needed, allows me to keep running cost
> as low as possible
>
> With zfs this is not possible (in a simple way) thus you have to start with
> the proper number of disks that you plan to use for some following  years
>
> Il 25 feb 2018 1:42 PM, "Andreas Steinel" <a.steinel at gmail.com> ha
> scritto:
>
> > On Sat, Feb 24, 2018 at 11:16 AM, Gandalf Corvotempesta
> > <gandalf.corvotempesta at gmail.com> wrote:
> > > In example, you can add/remove single disks
> > > You can change from any raid level to any raid level on the fly with no
> > > downtime or loss of redundancy
> > > You can grow /shrink a volume
> >
> > Good points, especially the shrink that, that does indeed currently
> > not work in ZFS. Yet I have to say, I'd never added a single disk in
> > an enterprise setup nor changed a RAID level on the fly. How often did
> > you do the latter? I just add at least one shelf to existing storage
> > boxes.
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-- 
Michael Bellerue
michael.bellerue at gmail.com
651.900.3068