So, what is the right information ? I'm lost. Please note that the /L parameter is only available on Windows Server 2012 and above. This creates NTFS volumes with large File Record Segments. We also recommend that you use the /L parameter of the FORMAT command for your database volumes (or the -UseLargeFRS parameter for the Format-Volume Powershell cmdlet), which will help avoid certain issues like CHECKDB failing with error 665. This doesn't mean that SQL Server will use an IO block size of the allocation unit size you pick - SQL will issue IOs as small as a single sector (512 bytes) or as large as 8 Megabytes for ColumnStore indexes. We recommend you follow Microsoft's recommendation of formatting volumes with an NTFS allocation unit size of 64 Kilobytes, unless you need to leverage NTFS' compression capabilities, which are only available on 4 Kilobyte allocation unit sized-volumes. On the Microsoft SQL Server Quick Reference : 1) It is important to format the volume with large NTFS File Record Segment (FRS) (4096 bytes instead of 1024 by default) as you could face NTFS limitation errors in future.
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