[zfs-discuss] L2ARC and SLOG on HW RAID with writeback cache

Richard Yao ryao at gentoo.org
Sun Apr 29 18:09:49 EDT 2018


Davik Horn told me years ago that people did it on Ubuntu/Debian. Due to technical issues (HFS+ as the rootfs was hardcoded into XNU), the first Mac OS X rootfs on a public version of ZFS was HFS+ on a zvol. I am not sure if the situation there has changed.

> On Apr 29, 2018, at 6:05 PM, Gordan Bobic <gordan.bobic at gmail.com> wrote:
> 
> 
> 
>> On Sun, 29 Apr 2018, 23:03 Richard Yao, <ryao at gentoo.org> wrote:
>> On Apr 29, 2018, at 5:51 PM, Gordan Bobic <gordan.bobic at gmail.com> wrote:
>> 
>>>> Another option is to put / on a zvol, have an initramfs import the pool and then mount / from the zvol. That is not very common, but I am told that Ubuntu/Debian users do it.
>>> 
>>> 
>>> It's generic and works on most distros. I've been using ZFS for rootfs for years.
>> 
>> By rootfs on zfs, do you mean on a zfs posix filesystem or a zfs zvol?
> 
> 
> ZFS POSIX. I don't quite get the use case for the rootfs on zvol.
> 
> 
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