what allocation or cluster size should I pick?

we are going to have millions of files on a drive that are static. they will only ever be added or deleted. half of the files are only a couple hundred bytes in size. the other half are roughly 80K in size on average (some lower, none higher than 300K).

for performance purposes (writing, reading, and deleting) what size should I format the NTFS drive as?

and for storage savings?

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64k block size if ur files are going to be big.  But u will loose space if u have loads of small files
larry urbanDevOps EngineerCommented:
however many  millions of files X 300K.
MrVaultAuthor Commented:
remember, of the millions of files, half are less than 1K and half average around 80K but can be as big as 300K.
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Just leave at default then
larry urbanDevOps EngineerCommented:
yes but since you do not know an exact amount, you should always err on the side of the most as to not run out of space.
MrVaultAuthor Commented:
we have more space to expand with if need be. I'm mostly concerned with performance.
For performance U need to tweak tcp\ip stack an Lanman.  I do have reg tweaks for this I can send u.  For normal files leave it as default siz
MrVaultAuthor Commented:
can you explain more vinchenzo?
Files less than 500 bytes are stored resident (inside MFT), and do not use cluster-based allocation at all.
Other files are average 80KB in size.

With a default cluster of 4KB, the space loss is 2KB per file on average, about 3% of usable space.

Dropping cluster size to 2KB would win 1.5% of disk space at a cost of increased management overhead, so not worth it.

Cluster sizes higher than 4KB have a side effect of losing compression on a volume, so probably not worth it as well.

Result: use 4KB clusters. If the volume is not extremely large, this will be a default. If default is higher, use that default value.

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MrVaultAuthor Commented:
thanks reclaime. i'll stick with default then.
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Windows Server 2008

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