#Ntfs allocation unit size windows
I mentioned my scenario (of 4K's) as an example to the OP, to let Windows choose the right AU size for a volume, unless you have a specific requirements if otherwise. I clarified this on my post, (Refer to the bold text), that is, the AU's you choose is abstract/has no bearing from how Dedup operates. MS dedupe does not use chunks smaller then 32KB so your statement about relation with 4KB AUs on your volume has very little to zero sense :) See: Once volumes are beyond a certain size, you'll have to use a set unit size. Unit size of a volume for the reasons to store particular file sizes on it for effecient use of space or as a performance benefit. The default cluster size is depended on file system ( NTFS, FAT or exFAT ), the size of partition, and the version of your Windows. > What Allocation Unit Size To Use When Formatting A USB Fash Drive In FAT32 > File Allocation Table > What Allocation Unit Size Should I Use for FAT32 I hope this helps. Here is some information that will help explain in more detail.
Since a block is a unit of allocation, if a file is between 1 byte and the file system’s allocation unit size, it will take up exactly one block/cluster on the file system. By default, it is 4KB and can be as large as 2MB. I guess I'd only ever select a particular file allocation If you format a partition (either in Disk Management or Command Prompt) without specifying the allocation unit size, the default allocation unit size will be used. As far as I know, does not matter if you use 32k or 64k for the allocation unit, the main point of the document is to change the primary align of the partition, so the blocks will never step on the middle of the LUN chunk and VMFS block. I think the confusion here is the File Allocation Unit Size used between NTFS and FAT32. On NTFS, this is referred to as the NTFS Allocation Unit Size and is a configurable attribute of the file system.
Be aware however, that using allocation unit sizes greater than 4 KB results in the inability to use NTFS compression on the volume.
Re: URGENT PLEASE : iSCSI LUN Block size Quote Post by dolbyman » Sun 2:08 am talk to qnap or maybe switch to an enterprise level nas. dolbyman Guru Posts: 25065 Joined: Sat 2:11 am Location: Vancouver BC, Canada. I have 4K set on mine, that was automatically selected for my 1TB (931TiB) volume. When formatting the partition that will be used for SQL Server data files, it is recommended that you use a 64-KB allocation unit size for data, logs, and tempdb. Microsoft recommends NTFS with an allocation unit size of 64 Kilobytes. IMO, the chuck sizes dedup operates upon are abstract from the file allocation unit size of a volume.
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