Following is an example of output from the old DEC PSDC V2.2-51 running on Alpha VMS 8.3
$ advise collect report disk disk$user1 /out=scr:t.t   
%PSDC-W-GETMSGWARN, $GETMSG System Service Warning
-SYSTEM-S-BUFFEROVF, output buffer overflow
$ list scr:t.t
Disk Analysis                   _DSA1200: (USER1)                       Page   1
Detailed Volume Analysis                                            PSDC V2.2-51
                           Thursday 27-MAY-2010 15:11


Items preceded by 'I', 'M' or 'S' are controlled by Initialize,
Mount or Sysgen.

(I  ) Volume name  is 'USER1       '.
(I  ) Serial number is           0.
(I  ) Creation date was  6-AUG-2007 22:27:36.59.
(I  ) Volume owner is 'USERFILES   '.
(IM ) Owner uic is [FILSYS].
(I  ) Format type  is 'DECFILE11B  '.
(IM ) Volume protection is [RWED,RWED,RWED,RWED].
(IMS) Default data checking is NOREAD-CHECK, NOWRITE-CHECK.
(I  ) Structure level is   2, version   1.
(I  ) Allocation cluster size is     8 blocks.
(I  ) Index file bitmap is located at LBN     131032.
(IM ) Default file extension is   128 blocks.
(IM ) Default window size is  80 retrieval pointers.
(I  ) Maximum number of files allowed is    3950710.
24>/header
  Space Allocated per Header     No. Headers    Cum % Headers
  --------------------------     -----------    -------------

  >=         8,  <        16         360644          77.1
  >=        16,  <        24          44266          86.5
  >=        24,  <        40          25967          92.1
  >=        40,  <        80          15206          95.3
  >=        80,  <       160           8313          97.1
  >=       160,  <       240           3977          98.0
  >=       240,  <       400           3161          98.7
  >=       400,  <       800           1881          99.1
  >=       800,  <      1600           1209          99.3
  >=      1600,  <      2400            805          99.5
  >=      2400,  <      4000           1080          99.7
  >=      4000,  <      8000            735          99.9
  >=      8000,  <     16000            391         100.0
  >=     16000,  <     24000             97         100.0
  >=     24000,  <     40000             48         100.0
  >=     40000,  <     80000             33         100.0
  >=     80000,  <    160000             15         100.0
  >=    160000,  <    240000              3         100.0
  >=    240000,  <    400000              4         100.0
  >=    400000                            6         100.0
95>

Minimum allocated extent =          8.
Maximum allocated extent =    1215440.
Total allocated blocks   =   36124432 ( 86.1 % of volume).
Total used      blocks   =   33318114 ( 92.2 % of allocated).
No. extents allocated    =     561365.
Mean alloc blocks/extent =         64.
Total no. of files       =     486557.
Mean alloc blocks/file   =         74.
Mean no. extents/file    =          1.15.
No. extension headers    =        790.
No. multi-volume files   =        103.
No. directories          =       5767.

109> Exit 
$ 

The original PAKs are still loaded, so this probably requires a license to work.