Geli and ZFS
terje at elde.net
Thu Oct 10 18:08:48 UTC 2013
On Oct 9, 2013, at 6:43 AM, yudi v <yudi.tux at gmail.com> wrote:
> Generally, it's recommended to let ZFS manage the whole disk if possible,
> so I was wondering if the second option is better.
> I will be using couple of 3TB HDDs mirrored for data and want to encrypt
IIRC, there is/was a major performance-difference on Solaris between using ZFS on a partition, or a whole disk. FreeBSD is happy with either.
The two alternatives you mentioned were:
ZFS over GELI over disk
ZFS over GELI over ZFS over disk
While ZFS wouldn't get the raw disk in setup #1, the left-most ZFS wouldn't get it in the second scenario either.
> I am hoping someone with an in-depth understanding of ZFS will be able to
> offer some insight.
What I usually do and recommend is using GPT with labels for the partitions you'll put GELI/ZFS on.
There's a couple of different reasons for this:
* It'll let you create your zpool on /dev/gpt/label, which will make it easy to find even when the device moves (harddisk-renumbering, changes from internal ATA to USB enclosure… )
* You don't run things through ZFS twice.
* The disk is fully encrypted.
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