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====== NAS - Build a Linux NAS - Create a Filesystem ======

<code bash>
sudo mkfs.ext4 /dev/md0
</code>

<WRAP info>
**NOTE:**  **/dev/md0** can be used now just as any other block device.

The following formulae can be used to calculate the best settings for the filesystem:

  * **blocksize (in KiB)** = 4
  * **chunksize (in KiB)** = 512
  * **stride** = chunksize / blocksize = 512 / 4 = 128;
    * IMPORTANT:  stride has to be multiple of 2!
  * **effective_disks** = 
    * If Raid6 = number of disks - 2.
    * if Raid5 = number of disks - 1.
    * if Raid1 = number of disks / 2.
    * if Raid10 = number of disks / 2.
  * **stripe-width** = stride * effective_disks;

<code bash>
mkfs.ext4 -b 4096 -E stride=128,stripe-width=256 /dev/md0
</code>

For further details, get a recent e2fsprogs and look for stride, stripe etc. in the man page. 

</WRAP>