The DRBD expansion of big data's Migration

Expand the capacity of the master / backup physical data disk:

[root@MySQL02 ~] # drbdadm down data

[root@MySQL02 ~] # mount / dev/sdb1 / mnt/

[root@MySQL02] # df-h

Filesystem Size Used Avail Use% Mounted on

/ dev/sda3 7.2G 1.9G 5.0G 28% /

Tmpfs 242m 0 242m 0% / dev/shm

/ dev/sda1 194M 57M 128m 31% / boot

/ dev/sdb1 380M 11m 350m 3% / mnt # you can see that the disk utilization of the backup node is only 380m

[root@MySQL02 ~] # parted / dev/sdb p

Model: Msft Virtual Disk (scsi)

Disk / dev/sdb: 2147MB

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Number Start End Size Type File system Flags

1 32.3kB 814MB 814MB primary ext4 # however, the true size of the backup node is 814m

2 814MB 979MB 165MB primary

[root@MySQL02 ~] # umount / mnt/

[root@MySQL02 ~] # e2fsck-f / dev/sdb1 # View partition size

E2fsck 1.41.12 (17-May-2010)

Pass 1: Checking inodes, blocks, and sizes

Pass 2: Checking directory structure

Pass 3: Checking directory connectivity

Pass 4: Checking reference counts

Pass 5: Checking group summary information

/ dev/sdb1: 38 non-contiguous 100744 files (0.0% non-contiguous), 22971 Universe 401409 blocks

[root@MySQL02 ~] # resize2fs / dev/sdb1 # reallocate partitions (capacity expansion)

Resize2fs 1.41.12 (17-May-2010)

Resizing the filesystem on / dev/sdb1 to 795184 (1k) blocks.

The filesystem on / dev/sdb1 is now 795184 blocks long.

[root@MySQL02 ~] # mount / dev/sdb1 / mnt/

[root@MySQL02] # df-h

Filesystem Size Used Avail Use% Mounted on

/ dev/sda3 7.2G 1.9G 5.0G 28% /

Tmpfs 242m 0 242m 0% / dev/shm

/ dev/sda1 194M 57M 128m 31% / boot

/ dev/sdb1 752m 11m 703m 2% / mnt # backup node disk space has been increased to maximum

[root@MySQL02 ~] # ls / mnt/