/BUFFER_SIZE=n

    The InfoServer block cache is structured as an array of fixed-
    size buffers (also called buckets.) The /BUFFER_SIZE qualifier
    determines the size of each bucket. (The /CACHE qualifer
    determines the number of buckets.)

    The numeric value of this parameter is an integer between 3 and
    8 inclusive, representing the bucket size in 512-byte blocks as
    follows:

       3 -   8 blocks (default)
       4 -  16 blocks
       5 -  32 blocks
       6 -  64 blocks
       7 - 128 blocks
       8 - 256 blocks

    The default value is 3.

    Bucket sizes that are larger than 32 blocks are not appropriate
    for most users. The OpenVMS client segments I/O requests that
    are larger than 31 blocks into 31-block chunks, and the default
    bucket readahead behavior might result in unnecessary I/O
    activity to the disk.