notes/btrfs.md

@@ -10,8 +10,6 @@
   - [Recovery](#recovery)
   - [Drive Manipulation](#drive-manipulation)
     - [Replace Drives](#replace-drives)
-  - [Filesystem Manipulation](#filesystem-manipulation)
-    - [Upgrading Btrfs block group cache to V2](#upgrading-btrfs-block-group-cache-to-v2)
   - [Balances](#balances)
   - [Scrub](#scrub)
   - [Snapshots](#snapshots)
@@ -43,20 +41,6 @@ To get detailed information and serial number of a specific drive:
 smartctl -i /dev/sdc
 ```
 
-**Find the Device Path from UUID**
-
-Using lsblk:
-
-```bash
-lsblk -o NAME,UUID,MOUNTPOINT
-```
-
-Using blkid:
-
-```bash
-blkid | grep <UUID>
-```
-
 ## Information on Filesystem
 
 **Show Basic Filesystem Information**
@@ -132,22 +116,6 @@ To change the default subvolume if a non-standard one is set:
 btrfs subvol set-default 257 /mnt/tmp/
 ```
 
-**Verify Current Cache Version**
-
-To check if your filesystem is using cache V1 by device:
-
-```bash
-btrfs inspect-internal dump-super -f /dev/<device> | grep cache_generation
-```
-
-To check if your filesystem is using cache V1 by UUID:
-
-```bash
-btrfs inspect-internal dump-super -f $(blkid -U <UUID>) | grep cache_generation
-```
-
-- If cache_generation is present, it indicates cache V1 is in use. If it's absent, the filesystem is already using V2.
-
 ## Backup Procedures
 
 **Desktop Backup: Root and Home**
@@ -351,70 +319,6 @@ btrfs replace status -i /mnt/media
 - It can be used for upgrading storage by replacing smaller drives with larger ones, or for replacing failing drives.
 - Ensure that the target drive has enough space to accommodate the data from the source drive.
 
-## Filesystem Manipulation
-
-### Upgrading Btrfs block group cache to V2
-
-**From a running system non-root filesystems**
-
-```bash
-mount -o remount,clear_cache,space_cache=v2 /mnt/<mount-point>
-```
-
-**From a running system on root**
-
-Check if your filesystem is using cache V1:
-
-```bash
-btrfs inspect-internal dump-super -f /dev/<device> | grep cache_generation
-```
-
-Enable Cache V2
-
-```bash
-nano /etc/default/grub
-# Locate the line starting with GRUB_CMDLINE_LINUX_DEFAULT or GRUB_CMDLINE_LINUX and add the following options:
-rootflags=clear_cache,space_cache=v2
-```
-
-Example:
-
-```bash
-GRUB_CMDLINE_LINUX_DEFAULT="quiet splash rootflags=clear_cache,space_cache=v2"
-```
-
-```bash
-update-grub
-reboot
-```
-
-Verify the Change
-
-```bash
-btrfs inspect-internal dump-super -f /dev/<device> | grep cache_generation
-```
-
-Remove `clear_cache` Option
-
-```bash
-nano /etc/default/grub
-# Remove clear_cache from the rootflags.
-update-grub
-```
-
-**From a live system**
-
-```bash
-apt update
-apt install btrfs-progs
-lsblk -o NAME,UUID
-blkid
-mount -o clear_cache,space_cache=v2 /dev/disk/by-uuid/<UUID> /mnt
-btrfs inspect-internal dump-super -f /dev/disk/by-uuid/<UUID> | grep cache_generation
-umount /mnt
-
-```
-
 ## Balances
 
 **Perform a Full Balance with Minimal Usage**