Error trying to promote ZFS clone - what do I need to do to troubleshoot this? Post: 303014233

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Operating Systems Solaris Error trying to promote ZFS clone - what do I need to do to troubleshoot this? Post 303014233 by Peasant on Wednesday 7th of March 2018 11:14:21 PM

03-08-2018

Moderator

Which is understandable.
You have created a clone of rpool/ai filesystem as a descendant filesystem of of rpool/ai filesystem.
While this is possible and working, you will not be able to promote that filesystem rpool/ai/my_new_ai_clone due to above condition.
But you will be able to use it as you see fit.

This will work, as you noticed :

Code:

somezpool/ai/filesystem1 # filesystem1 is mounted under /somezpool/ai/filesystem1 and contains data.
somezpool/ai/filesystem1@today # take snap
somezpool/ai/filesystem1_clone # create clone under somezpool/ai/filesystem1_clone

zfs promote of filesystem1_clone to filesystem1 will now work.

Do not confuse directories and filesystems in zfs.
zfs will create nested filesystems on top of each other and mount them like that due to mount point inheritance behavior.
/mypool -> zfs create mypool/dump/somefilesystem

Result :

A zfs filesystem mypool/dump/somefilesystem is created and mounted under /mypool/dump/somefilesystem, unless overridden with -o mountpoint=/some/other/mountpoint during zfs create command.

Of course, mountpoint can be changed anytime with zfs set, as long as nothing is accessing the mountpoint.

rollback/promotion/cloning of entire filesystem hierarchy (dataset) is not possible, only one filesystem at the time.
While snapshots, destroy and sending will work on entire dataset recursively if -r is ran against the parent dataset.

Hope that helps
Regards
Peasant.

Peasant

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LEARN ABOUT FREEBSD

zfsloader

ZFSLOADER(8)						    BSD System Manager's Manual 					      ZFSLOADER(8)

NAME

     zfsloader -- kernel bootstrapping final stage

DESCRIPTION

     zfsloader is an extended variant of loader(8) with added support for booting from ZFS.  This document describes only differences from
     loader(8).

ZFS FEATURES

     zfsloader supports the following format for specifying ZFS filesystems which can be used wherever loader(8) refers to a device specification:

     zfs:pool/filesystem:

     where pool/filesystem is a ZFS filesystem name as described in zfs(8).

     If /etc/fstab does not have an entry for the root filesystem and vfs.root.mountfrom is not set, but currdev refers to a ZFS filesystem, then
     zfsloader will instruct kernel to use that filesystem as the root filesystem.

ZFS COMMAND EXTENSIONS

     lsdev [-v]
	     Lists ZFS pools in addition to disks and partitions.  Adding -v shows more ZFS pool details in a format that resembles zpool status
	     output.

     lszfs filesystem
	     A ZFS extended command that can be used to explore the ZFS filesystem hierarchy in a pool.  Lists the immediate children of the
	     filesystem.  The filesystem hierarchy is rooted at a filesystem with the same name as the pool.

FILES

     /boot/zfsloader  zfsloader itself.

EXAMPLES

     Set the default device used for loading a kernel from a ZFS filesystem:

	   set currdev=zfs:tank/ROOT/knowngood:

SEE ALSO

     gptzfsboot(8), loader(8), zfs(8), zfsboot(8), zfsloader(8), zpool(8)

HISTORY

     The zfsloader first appeared in FreeBSD 7.3.

AUTHORS

     This manual page was written by Andriy Gapon <avg@FreeBSD.org>.

BSD
								September 15, 2014							       BSD