Re: ZFS LZ4 Upgrade

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On 06/03/13 11:52, Kenta Suzumoto wrote:
> Hi. I'm planning on doing a ZFS root installation on a remote
> server very soon. The company only offers a 9.0 and 9.1
> installation and "rescue" (nfs/pxe boot with ramdisk basically)
> system. I'd like to use LZ4 with the ZFS root pool, so I'm going to
> be upgrading to -STABLE once I have the initial system installed.
> Here's what I'll do:
> 
> - install the 9.1 system - svn source, buildworld/kernel, install, 
> reboot - upon booting the -STABLE system, begin enabling LZ4 
> compression on /usr/ports /usr/src etc.
> 
> Will this work, or do I need to find some way to initially create
> the zpool with a -STABLE system? Is it just a matter of running
> "zfs upgrade" and "zpool upgrade" before enabling LZ4, or am I
> missing something? Thanks

This should work, you don't have to have the pool created on a -STABLE
system and can always do 'zpool upgrade' when necessary.

Please note that if you want to upgrade the root pool, make sure that
you have a fresh bootblock before rebooting ("zpool upgrade" should
give you a reminder).  The FreeBSD ZFS boot code supports booting from
LZ4 compressed datasets.

I would recommend using a dedicated root pool by the way, it have a
lot of advantages, like you can use a separate ZIL device for the
non-root pool, etc. and have the flexibility of using different RAID-Z
layout for different purpose (e.g. mirror for boot pool and RAID-Z for
the rest), so your remote hands would be able to just remove one disk
and your system is bootable, in the case when the first disk's boot
partition is physically damaged.

Cheers,
- -- 
Xin LI <delphij@delphij.net>    https://www.delphij.net/
FreeBSD - The Power to Serve!           Live free or die
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