Re: Fwd: Moving ZFS root popol to a virtual server was: ZFS: Suspended Pool due to allegedly uncorrectable I/O error

On 8/25/24 19:25, Pamela Ballantyne wrote:
> On Sun, Aug 25, 2024 at 2:30 AM Ronald Klop wrote:
>> [Replicating pools] is certainly possible but small details can result in a non-bootable
>> pool on the target.
>>
>> Can you provide some information on how you moved the root pool to the
>> virtual server?
>> Did you dd the whole disk to a file? Or did you zfs send | zfs receive a
>> snapshot? Or ... ?
>> What boot-loader was used on the old server and what on the new one? Is
>> the partitioning the same on both?
>> I remember the old server had mirrored disks, how did you setup the
>> virtual server?
>>
> Thank you, Ronald.  I still need to get the new server, I have a meeting
> with the engineers at the hosting company tomorrow.
> I will see what they have to offer.
> 
> To prepare for a migration, I've tried setting up a 13.4 server on
> VirtualBox and then creating a second one as a target.
> I've successfully done a ZFS send/recv and duplicated the original
> installation on the target server.
> 
> But something quite strange did happen. I created the original with a
> single two-disk mirror, but just made a single disk
> pool on the target. Once the OS was successfully transferred, I configured
> another virtual disk, identical to the pool disk
> and tried to attach it. ZFS rejected it with "cannot attach ada0p3 to
> ada1p3: can only attach to mirrors and top-level disks"
> 
> I looked around and found a suggestion to change vfs.zfs.min_auto_ashift
> from 12 to 9, which I did (without understanding why), allowing me to add
> the mirror successfully.
> 
> But this is strange because the original installation was created directly
> from the FreeBSD install files, which should have set it to 12? It
> certainly was for the creation of everything on the second system.
> 
> Hopefully, I will be able to duplicate this experience with the new host,
> munis the shift setting!
> 
> Thank you *so* *much*
> Pammy


The freebsd-fs mailing list page does not indicate the scope of this 
mailing list:

https://lists.freebsd.org/subscription/freebsd-fs


I am wondering if this thread should be moved to freebsd-questions, as 
this thread is about advanced use of file systems rather than file 
system development and issues (?).


Prose descriptions of actions performed on a computer are useful for 
understanding "who" and "why", but console sessions provide facts that 
are useful for understanding "what", "where", "when", and "how".  A good 
post may contain both.  Please run the following commands on your 
colocated server and post the complete console session (prompt, commands 
entered, output displayed):

# freebsd-version -kru ; uname -a

# geom disk list

# gpart show -l -p

# zpool list

# zpool iostat -v

# zpool status

# zpool get all | sort


David