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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 303044633 by Peasant on Friday 28th of February 2020 10:10:48 AM
Old 02-28-2020
If you are using LVM, you can use logical volume snapshot ability to achieve want you want.

BRTFS i have not used, but i did read some horror stories some time ago.
Probably nothing to worry about for home use, since those bugs were about raid protection.

ZFS in ubuntu, for instance, is openzfs (OpenZFS)
This is a mature and high quality file system & volume manager, but i would not use it for root just yet.

For data disks, i see no reason to reap the benefits of snapshots, compression and deduplication.
Just be sure those dedup tables fit in memory Smilie

Here is a quick example of LVM snapshots from my home box which is filesystem agnostic :
Code:
root@box:~# vgdisplay  dumpvg
  --- Volume group ---
  VG Name               dumpvg
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <1.82 TiB
  PE Size               4.00 MiB
  Total PE              476931
  Alloc PE / Size       262144 / 1.00 TiB
  Free  PE / Size       214787 / 839.01 GiB
  VG UUID               Qtrbm7-GEAz-CcgA-JOUV-6eZ1-qrZ6-L4ey3h
root@box:~# mount | grep dumpvg
/dev/mapper/dumpvg-dumpvol on /srv/dump type xfs (rw,noatime,attr2,inode64,noquota)
cd /srv/dump/some_files
root@box:/srv/dump/some_files# ls -rlt
total 4
-rw-r--r-- 1 root root 19 Feb 28 15:49 file1.txt
root@box:/srv/dump/some_files# cat file1.txt 
Some stuff written
root@box:/srv/dump/some_files#

You need to have free space in volume group to create a snapshot, as i do, so lets create a snapshot.
We also specify that 5GB of total space in VG that can be consumed by system to maintain snapshot.
Code:
root@box:/srv/dump/some_files# lvcreate -L 5G -s -n lv_snap_$(date "+%Y%m%d%H%M") /dev/dumpvg/dumpvol
  Logical volume "lv_snap_202002281552" created.
root@box:/srv/dump/some_files# rm -f file1.txt
root@box:/srv/dump/some_files# mount -o ro,nouuid /dev/dumpvg/lv_snap_202002281552 /srv/dump_snap/
root@box:/srv/dump/some_files# ls -lrt /srv/dump_snap/some_files/
total 4
-rw-r--r-- 1 root root 19 Feb 28 15:49 file1.txt

Hope that helps
Regards
Peasant.
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