Why is the initial replication taking more space than expected?

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h2. Question
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h2. Solution
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Please see the following example:

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[root@test-linux ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 73G 3.6G 66G 6% /
/dev/sda1 101M 9.7M 86M 11% /boot
none 251M 0 2 51M 0% /dev/shm
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In the example above, "df \-h" shows only 3.6G of used data on /dev/sda3. This size value includes only file contents. To get all allocated blocks, we must use a different utility, and make some additional calculations.
{code}[root@test-linux ~]# dumpe2fs /dev/sda3
dumpe2fs 1.35 (28-Feb-2004)
Filesystem volume name: /
Last mounted on:
Filesystem UUID: aa613f36-ce53-4158-a512-fef68aabfd3a
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr filetype needs_recovery sparse_super
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 9629696
Block count: 77031672
Reserved block count: 3851583
Free blocks: 72007352
Free inodes: 9506828
First block: 1
Block size: 1024{code}
In this example, we are interested in Block count, free blocks, and block size.

To get the total number of blocks allocated we take:
block count (77031672) - free blocks (72007352) = 5024320 blocks

To get the amount of data CDP will backup:
5024320 blocks * Block size (1024) = 5144903680 bytes \~4.79 GB

Compare the 4.79 GB to the "df \-h" output of 3.6GB. That extra \~1GB is the space used by the ext3 file system.

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