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Re: Access ZFS pool in debian 10 single user mode

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> On Wed, 2 Sep 2020 at 22:06, Dan Ritter <dsr@randomstring.org> wrote:
> 
>> James Allsopp wrote:
>>> Hi,
>>> Just trying to move var to a zfs partition. Rebooted into recovery mode,
>>> but could access the zfs pool. I tried to modprobe zfs, but still
>> nothing.
>>> Is there something else I should be doing?
>>>
>>
>> Does your recovery mode have the zfs kernel modules and zfsutil?
>>
>> Without it, you'll never mount things.

On 2020-09-03 01:34, James Allsopp wrote:
 > This is just debian grub recovery mode so on the same machine, so 
hopefully
 > zfsutil will be there. Looked at this;
 > zfs                  4214784  9
 > zunicode              335872  1 zfs
 > zlua                  172032  1 zfs
 > zavl                   16384  1 zfs
 > icp                   331776  1 zfs
 > zcommon                98304  2 zfs,icp
 > znvpair                90112  2 zfs,zcommon
 > spl                   122880  5 zfs,icp,znvpair,zcommon,zavl
 >
 > So if I just modprobe those from the column on the left, it should work?


[Top posted reply moved to bottom.]


I am unable to find a canonical Debian policy on the subject of posting 
style for Debian mailing lists:

https://www.debian.org/MailingLists/#codeofconduct

https://www.debian.org/code_of_conduct


Most readers of this list seem to prefer attributed, indented, trimmed, 
interleaved posting style, but this response is bottom posted:

https://en.wikipedia.org/wiki/Posting_style


This is a popular essay on the subject:

http://www.catb.org/~esr/faqs/smart-questions.html


[Back to the technical discussion.]


I appears that Debian single-user mode does not load the kernel modules 
you need.  I assume this is by design, so that you can boot the system 
when you have a bad module.


Loading modules by hand in single user mode might work, but there is the 
chicken-and-egg question starting with "can you boot into single user 
mode without a /var filesystem?".


I find it is very useful to have a complete Debian installation on a USB 
flash drive with all the software I need to do system administration on 
Debian machines.  Using such, I could easily move /var to ZFS.  But, I 
don't know if the target system would work correctly.


If I wanted /var on ZFS on a Debian system, I would "go the whole way" 
and STFW for a guide on building a Debian system with ZFS-on-root.  Or, 
I would look for a Linux distribution (Ubuntu?) that can do ZFS-on-root 
OOTB.  But, the best answer I have found for ZFS is FreeBSD.


David

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Thread

Access ZFS pool in debian 10 single user mode James Allsopp <jamesaallsopp@googlemail.com> - 2020-09-02 22:50 +0200
  Re: Access ZFS pool in debian 10 single user mode Dan Ritter <dsr@randomstring.org> - 2020-09-02 23:10 +0200
    Re: Access ZFS pool in debian 10 single user mode James Allsopp <jamesaallsopp@googlemail.com> - 2020-09-03 10:40 +0200
      Re: Access ZFS pool in debian 10 single user mode Alex Mestiashvili <amestia@rsh2.donotuse.de> - 2020-09-03 12:00 +0200
      Re: Access ZFS pool in debian 10 single user mode David Christensen <dpchrist@holgerdanske.com> - 2020-09-04 00:50 +0200
        Netiquette Guidelines (was: Re: Access ZFS pool in debian 10 single  user mode) Charles Curley <charlescurley@charlescurley.com> - 2020-09-04 05:40 +0200

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