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Top Forums UNIX for Beginners Questions & Answers Should I use a CoW filesystem on my PC if I only wanted snapshot capabilities ? Post 303045040 by sreyan32 on Wednesday 11th of March 2020 05:30:17 AM
Old 03-11-2020
Quote:
Originally Posted by stomp
Encryption makes the backup task more difficult.
Unfortunately I need it, I can't avoid it.

Quote:
Originally Posted by stomp
Since you're a beginner, a CloneZilla can be a fallback solution until you're famillar enough with your linux os. With CloneZilla you can save and restore the os partition without knowing very much about linux.
Okay Clonezilla is not an option for me. Simply because I don't have that much of space to spare. It seems I am not getting the answer that I want because I am not asking the right questions.

So let me apologize for that, and let me ask if the following workflow is possible on Linux.
  1. I have a single 1 TB SATA hard disk.
  2. I will be using an encrypted LVM with ext4 formatting.
  3. Now lets say before an update or a dist-upgrade I take a snapshot of the root partition and store that snapshot in the root partition itself.
  4. The upgrade or update fails or is causing problems, and the system is no longer bootable to my desktop.
  5. I boot into a live CD.
  6. Mount my encrypted partitions, and /proc, /sys and /dev from the live CD.
  7. Chroot into my system.
  8. Find the saved snapshot.
  9. Revert it.
  10. Exit from Live CD environment and boot back to the reverted system.

Main Challenges:
  1. Will the backup process work ?
  2. Will the Live CD of my OS contain CLI tools to decrypt encrypted partitions ?

As you can see, I cannot forego full-disk encryption nor do I have that much space or time for a full cold boot snapshot of a partition.

So is the above workflow possible ?
 

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NetApp::Snapshot(3pm)					User Contributed Perl Documentation				     NetApp::Snapshot(3pm)

NAME
NetApp::Snapshot -- OO class for creating and managing snapshots SYNOPSIS
use NetApp::Filer; use NetApp::Snapshot; my $filer = NetApp::Filer->new( .... ); DESCRIPTION
This class encapsulates a single NetApp snapshot, and provides methods for querying information about the snapshot, as well as methods for managing it. METHODS
get_parent Returns the NetApp::Aggregate or NetApp::Volume object for the aggregate or volume for which object is a snapshot. get_name Returns a string representing the name of the snapshot. get_date Returns the date the snapshot was created. get_used Returns the percentage of space used by snapshot. get_total Returns the percentage of total space used by the snapshot. get_snapshot_deltas Returns an array of NetApp::Snapshot:Delta objects, each representing a single delta for this snapshot. get_reclaimable Returns the amount of reclaimable space, if the snapshot is deleted. Note that experimentally, this command has a lot of failure scenarios, most of which are reasonable (there are a lot of cases where you can't query this data). Therefore, unlike most of the methods in this API, it doesn't raise a fatal exception if it can't query the information, it simply generates warnings. rename( $newname ) Renames the snapshot to the specified name. restore( %args ) This method is an interface to the "snap restore" command. The argument syntax is: $snapshot->restore( type => 'vol' | 'file', # Defaults to vol from_path => $from_path, to_path => $to_path, ); The 'type' argument maps to the -t CLI argument, and the 'to_path' argument maps to the -r CLI argument. Refer to the na_snap(1) man page, and the "snap restore" documentation for further information. perl v5.14.2 2008-11-26 NetApp::Snapshot(3pm)
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