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 CENTOS

amzfs-sendrecv

AMZFS-SENDRECV(8)					  System Administration Commands					 AMZFS-SENDRECV(8)

NAME

       amzfs-sendrecv - Amanda script to create zfs sendrecv

DESCRIPTION

       amzfs-sendrecv is an Amanda application implementing the Application API. It should not be run by users directly. It create a zfs snapshot
       of the filesystem and backup the snapshot with 'zfs send'. Snapshot are kept after the backup is done, this increase the disk space use on
       the client but it is neccesary to be able do to incremental backup. If you want only full backup, you can disable this feature by setting
       the KEEP-SNAPSHOT property to 'NO'. Only the restoration of the complete backup is allowed, it is impossible to restore a single file.

       The application is run as the amanda user, it must have many zfs priviledge:

	   zfs allow -ldu AMANDA_USER mount,create,rename,snapshot,destroy,send,receive FILESYSTEM

       Some system doesn't have "zfs allow", but you can give the Amanda backup user the rights to manipulate ZFS filesystems by using the
       following command:

       usermod -P "ZFS File System Management,ZFS Storage Management" AMANDA_USER
       This will require that your run zfs under pfexec, set the PFEXEC property to YES.

       The format of the diskdevice in the disklist (DLE) must be one of:

       Desciption	       Example
       ----------	       -------
       Mountpoint	       /data
       ZFS pool name	       datapool
       ZFS filesystem	       datapool/database
       ZFS logical volume      datapool/dbvol

       The filesystem doesn't need to be mounted.

PROPERTIES

       This section lists the properties that control amzfs-sendrecv's functionality. See amanda-applications(7) for information on the
       Application API, application configuration.

       DF-PATH

	   Path to the 'df' binary, search in $PATH by default.

       KEEP-SNAPSHOT

	   If "YES" (the default), snapshot are kept after the backup, if set to "NO" then snapshot are no kept and incremental backup will fail.

       ZFS-PATH

	   Path to the 'zfs' binary, search in $PATH by default.

       PFEXEC-PATH

	   Path to the 'pfexec' binary, search in $PATH by default.

       PFEXEC

	   If "NO" (the default), pfexec is not used, if set to "YES" then pfexec is used.

EXAMPLE

       In this example, a dumptype is defined to use amzfs-sendrecv application to backup a zfs filesystem.
	define application-tool amzfs_sendrecv {
	  comment "amzfs-sendrecv"
	  plugin "amzfs-sendrecv"
	  #property "DF-PATH"  "/usr/sbin/df"
	  #property "KEEP-SNAPSHOT" "YES"
	  #property "ZFS-PATH" "/usr/sbin/zfs"
	  #property "PFEXEC-PATH" "/usr/sbin/pfexec"
	  #property "PFEXEC" "NO"
	}

	define dumptype user-zfs-sendrecv {
	  program "APPLICATION"
	  application "amzfs_sendrecv"
	}

SEE ALSO

       amanda(8), amanda.conf(5), amanda-client.conf(5), amanda-applications(7)

       The Amanda Wiki: : http://wiki.zmanda.com/

AUTHOR

       Jean-Louis Martineau <martineau@zmanda.com>
	   Zmanda, Inc. (http://www.zmanda.com)

Amanda 3.3.3							    01/10/2013							 AMZFS-SENDRECV(8)