PROBLEM:  (QAR 58502,QAR 59094,QAR 61399,QAR 67023) (Patch ID: OSF440-060)
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This patch provides the following fixes and enhancements to AdvFS:

- AdvFS volumes were not setting the default I/O byte transfer size to the
  preferred size reported by the disk drives. This caused I/O consolidations
  to be smaller than is optimal for the disks.

  This patch now assigns the driver's preferred I/O transfer byte size to all
  new AdvFS volumes created with mkfdmn and addvol.

- AdvFS chvol read and write transfer size range was increased. With this
  patch the transfer size range is now between 16 and 3276 512-byte blocks.

- The read-ahead algorithm was modified to improve performance under certain
  conditions. The algorithm now sanity checks the number of pages that it
  would attempt to prefetch and apply the following restrictions when doing
  its calculations:

  o Only read-ahead the number of pages remaining in the file.
  o Use a predetermined percentage of the buffer pool for use as read-ahead
    buffers.