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Operating Systems Solaris Understanding ZFS Snapshots - why will it utilize space ? Post 303013387 by Peasant on Tuesday 20th of February 2018 03:34:50 PM
Old 02-20-2018
After the deletion of file1 USEDSNAP is telling you that there are pointers to 100MB of data.
In that time, 2 references exist in point in time for 100M of data.
snap1 - file1
snap2 - file1, file2

USED space in zpool has not changed after the deletion of file1.

Now, tank@snap1 is destroyed.
zfs list is telling you if you destroy the renaming snapshot (snap2), you will reclaim 100M of space as free space.
Since snap2 contains both files (one being 'live' one, other being referenced to) it is using 100M of space in zpool.

During the practice on the blog USEDSNAP column will always be 100M, after first snapshot creation, deletion of file1, second snapshot creation, first snapshot destroy.
This is not displayed clearly on the blog entry.

A good tehnical read Is it magic? | Oracle Matthew Ahrens' Blog

Hope that helps
Regards
Peasant.
This User Gave Thanks to Peasant For This Post:
 

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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
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