[zfs-discuss] Root ZFS boot slow - ubuntu 12.04

phil marsh marsh.pf at gmail.com
Wed Aug 21 22:03:15 EDT 2013

Hi Darik and all again,
However, I now suspect (just a guess) that if one changes the Zpool
configuration of the boot directory, that then the ZFS kernal module must
be re-installed because I think that the ZFS kernal is imprinted with the
local ZFS pool environment at the time of building and not after. After
building, one can construct new ZFS pools but the ZFS module and kernal
won't know about them and would not be able to use them to boot. I wonder
how else could the ZFS kernal module discover and retain the "knowledge" of
the ZFS pools between reboots?
Would mean that one could not change the structure of ZFS pools that
existed at the time of ZFS module building because the ZFS kernal module
would think they're there - even if they'd been changed?
I'm curious.

On Wed, Aug 21, 2013 at 5:01 PM, phil marsh <marsh.pf at gmail.com> wrote:

> Thanks so much Darik,
> I'm also planning to move the / directory, except for /boot (which will be
> on the thumbdrive of course) from my RAIDZ2 to a new mirrored ZFS /
> directory by just copying the directories in the original / to the new
> mirrored ZFS /. Since the ZFS package apparently customizes itself to the
> system, I'm hoping that I don't need to reinstall it for my proposed
> changes.
> I'll try it and let you know.
> Thanks,
> Phil
> On Wed, Aug 21, 2013 at 12:19 AM, phil marsh <marsh.pf at gmail.com> wrote:
>> I am running Ubuntu 12.04 with ZFS on the root directory boot / except
>> that the MBR and /boot/grub are on a hard drive (sda). The system had been
>> installed as in:
>> https://github.com/zfsonlinux/pkg-zfs/wiki/HOWTO-install-Ubuntu-to-a-Native-ZFS-Root-Filesystem
>> My fstab is set up with only the /boot/grub entry mounting onto sda as in
>> the website above.
>> and I notice that the boot is very slow -as though grub is searching for
>> the kernel for a long time.
>> I would therefore like to put all of /boot including the kernel onto a
>> USB thumbdrive or sda as I think this might solve the problem.
>> But how would I do this such that the system would boot? What if I used a
>> regular non-ZFS grub version and hosted the kernel in a non-zfs drive?
>> Would the kernel not be able to find it's files necessary to boot? What is
>> the minimum I could put onto the non-ZFS drive to satisfy the kernel boot
>> until ZFS is mounted? Basically, I would like to boot my system with most
>> of the system under the root drive of ZFS but the essentials, which are
>> needed prior to the ZFS mount, on the non-ZFS drive.
>> Please kindly advise.
>> Also, I am currently seeing problems with my Ubuntu 12.04 locking up
>> where the cursor and display are frozen. In this state, Ubuntu 12.04 still
>> responds to pinging over the LAN. I have just set up ssh to log in should
>> this freeze happen again.
>> Thanks,
>> Phil

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