BTRFS File System on Red Hat

BTRF FILE SYSTEM ON RED HAT

1.-CREATING A BTRF FILE SYSTEMM

mkfs.btrfs /dev/device

# mkfs.btrfs /dev/sdc1

2.-MOUNTING A BTRF FILE SYSTEM

mount /dev/device /mount-point

 
# mount /dev/sdc1 /btrfstest

3.-RESIZING A BTRF FILE SYSTEM 

You can increase the btrs file system in this case +200M 

btrfs filesystem resize amount /mount-point

#btrfs filesystem resize +500M /btrfstst

Resize '/btrfstest' of '+500M'  

4.-SHRINKING A BTRFS FILE SYSTEM 

btrfs filesystem show /mount-point

+
        devid    1 size 1.00GiB used 224.75MiB path /dev/vda
 devid    2 size 400.00MiB used 204.75MiB path /dev/vdb
 devid    3 size 2.00GiB used 8.00MiB path /dev/vdc
 devid    4 size 3.00GiB used 8.00MiB path /dev/vdd

btrfs filesystem resize devid:amount /mount-point

# btrfs filesystem resize 2:300M /btrfstest 

Resize '/btrfstest' of '2:300M' 

You has reduced the file system to 300M, you will need to know that if you perform this activity and the file system has information you can corrupt the data on the File System

5.-ADDING NEW DEVICE TO BTRSFS

# mkfs.btrfs /dev/device1
# mount /dev/device1

Next, add a second device to the mounted btrfs file system. 

# btrfs device add /dev/device2 /mount-point

 The metadata and data on these devices are still stored only on /dev/device1. It must now be balanced to spread across all devices.

# btrfs filesystem balance /mount-point

6.-REMOVING NEW DEVICE TO BTRSFS

Adding 

# btrfs device add /dev/sdc /mnt

Removing

# btrfs device delete /dev/sdc /mnt 

6.-SCANNING NEW DEVICE TO BTRSFS

To Scan all devices 

# btrfs device scan

To scan a single device, use the following command: 

# btrfs device scan /dev/device