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Question

Best Practices (Indexing Version 2) Block size

  • June 6, 2025
  • 1 reply
  • 152 views
Steinar
Bit
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The doc state:  Use a volume dedicated to the index cache directory formatted

with a block allocation size of 32K.

(Best Practices (Indexing Version 2)

 

  • Is this the LogicalSectorSize [Bytes Per Sector] or PhysicalSectorSize [Bytes Per Physical Sector] in a Windows server NTFS volume or is REFS type to be prefered ?
Steinar

    1 reply

    K
    Vaulter
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    Hi ​@Steinar,

     

    The recommendation in the Commvault documentation:

    "Use a volume dedicated to the index cache directory formatted with a block allocation size of 32K." refers to the NTFS volume allocation unit size, which is the block allocation size specified when formatting the volume using the format command or Disk Management in Windows.

     

    Block allocation size (allocation unit size) during volume formatting in Windows NTFS.

    This is not the same as:

    LogicalSectorSize (Bytes Per Sector) — typically 512 bytes or 4K.

    PhysicalSectorSize — the size of the underlying physical sector on disk.

     

    So, it is the allocation unit size (AUS) — the smallest chunk of disk space that a file can occupy.

     

    Thanks,

    Keshika 

    ​

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