大数据迁移之DRBD扩容
扩容主/备物理数据盘：# drbdadm down data
# mount /dev/sdb1 /mnt/
# df -h
Filesystem SizeUsed Avail Use% Mounted on
/dev/sda3 7.2G1.9G5.0G28% /
tmpfs 242M 0242M 0% /dev/shm
/dev/sda1 194M 57M128M31% /boot
/dev/sdb1 380M 11M350M 3% /mnt # 可以看到备节点磁盘利用率只有380M
# parted /dev/sdb p
Model: Msft Virtual Disk (scsi)
Disk /dev/sdb: 2147MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
NumberStart End Size Type File systemFlags
1 32.3kB814MB814MBprimaryext4 # 然而备节点真实大小为814M
2 814MB 979MB165MBprimary
# umount /mnt/
# e2fsck -f /dev/sdb1 # 查看分区大小
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: 38/100744 files (0.0% non-contiguous), 22971/401409 blocks
# resize2fs /dev/sdb1 # 重新分配分区（扩容）
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.
# mount /dev/sdb1 /mnt/
# df -h
Filesystem SizeUsed Avail Use% Mounted on
/dev/sda3 7.2G1.9G5.0G28% /
tmpfs 242M 0242M 0% /dev/shm
/dev/sda1 194M 57M128M31% /boot
/dev/sdb1 752M 11M703M 2% /mnt # 备节点磁盘空间已增加至最大
# ls /mnt/
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