formting volumes | file server | server 2012 | shadow copies


We are putting up new file servers and want to enable shadow copies for home folders.  So i am going to follow the advise in the his article and format the volume with 16kb allocation units

Is there any guidance on formating volumes that shadow copies won't be configured on?

Is there a way to work out what the allocation unit size should be?  is there some kind of formulae?   Perhaps we should format the volume that shadow copies will be configured on with a larger allocation unit size?
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David Johnson, CD, MVPOwnerCommented:
s there any guidance on formatting volumes that shadow copies won't be configured on? not really the automatic defaults are fine for everyday generic use.. A specific application may benefit is you tweak the formatting parameters to the detriment of other applications that use the same volume.
cmatchettAuthor Commented:
the volume that shadow copies will be stored on, format that with the automatic defaults also?
David Johnson, CD, MVPOwnerCommented:
If you plan to defragment the source volume on which Shadow Copies of Shared Folders is enabled, we recommend that you set the cluster allocation unit size to be 16 KB or larger
If you require NTFS file compression on the source volume, you cannot use an allocation unit size larger than 4 KB.

Most drives will have a cluster allocation size of 4KB by default
fsutil fsinfo ntfsinfo driveletter:
Bytes Per Cluster :               4096

only the source drive is important

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Windows Server 2012

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