Re: else or Debian (Re: ZFS performance (was: Re: deduplicating file systems: VDO with Debian?))
Am Thu, Nov 10, 2022 at 04:46:12AM +0100 schrieb hw:
> On Wed, 2022-11-09 at 18:26 +0100, Christoph Brinkhaus wrote:
> > Am Wed, Nov 09, 2022 at 06:11:34PM +0100 schrieb hw:
> > [...]
> > > FreeBSD has ZFS but can't even configure the disk controllers, so that won't
> > > work.
> >
> > If I understand you right you mean RAID controllers?
>
> yes
>
> > According to my knowledge ZFS should be used without any RAID
> > controllers. Disks or better partions are fine.
>
> I know, but it's what I have. JBOD controllers are difficult to find. And it
> doesn't really matter because I can configure each disk as a single disk ---
> still RAID though. It may even be an advantage because the controllers have 1GB
> cache each and the computers CPU doesn't need to do command queuing.
>
> And I've been reading that when using ZFS, you shouldn't make volumes with more
> than 8 disks. That's very inconvenient.
>
> Why would partitions be better than the block device itself? They're like an
> additional layer and what could be faster and easier than directly using the
> block devices?
Using the block device is no issue until you have a mirror or so.
In case of a mirror ZFS will use the capacity of the smallest drive.
I have read that a for example 100GB disk might be slightly larger
then 100GB. When you want to replace a 100GB disk with a spare one
which is less larger than the original one the pool will not fit on
the disk and the replacement fails.
With partitions you can specify the space. It does not hurt if there
are a few MB unallocated. But then the partitions of the diks have
exactly the same size.
Kind regards,
Christoph
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