Re: else or Debian (Re: ZFS performance (was: Re: deduplicating file systems: VDO with Debian?))
On Thu, 2022-11-10 at 08:48 -0500, Dan Ritter wrote:
> hw wrote:
> > And I've been reading that when using ZFS, you shouldn't make volumes with
> > more
> > than 8 disks. That's very inconvenient.
>
>
> Where do you read these things?
I read things like this:
"Sun™ recommends that the number of devices used in a RAID-Z configuration be
between three and nine. For environments requiring a single pool consisting of
10 disks or more, consider breaking it up into smaller RAID-Z groups. If two
disks are available, ZFS mirroring provides redundancy if required. Refer to
zpool(8) for more details."
That's on https://docs.freebsd.org/en/books/handbook/zfs/
I don't remember where I read about 8, could have been some documentation about
FreeNAS. I've also been reading different amounts of RAM required for
deduplication, so who knows what's true.
> The number of disks in a zvol can be optimized, depending on
> your desired redundancy method, total number of drives, and
> tolerance for reduced performance during resilvering.
>
> Multiple zvols together form a zpool. Filesystems are allocated from
> a zpool.
>
> 8 is not a magic number.
>
You mean like here:
https://pthree.org/2012/12/21/zfs-administration-part-xiv-zvols/
That seems rather complicated. I guess it's just a bad guide. I'll find out if
I use ZFS.
Reply to: