Conference vaxaxp::vmsnotes

655.0. "dpaxxx: disk space missing ?" by MSAPG1::ENG () Wed May 28 1997 08:25

Hello all, 

I have a customer running software raid V2.2 stripping on Openvms VAX V6.1. 
He reported to me that he has about 4 and 2 million blocks missing from his 
two bind set DPA500 and DPA600 respectively.

I have advised him to do a $anal/disk DPA500: and calculate the allocated block
instead of used block but it did not help. Any light sheded would be very much
appreciated.

Attach to the end of this note are the information collected from the customer.
I have posted this same problem in COOKIE::RAID_SOFTWARE_FOR_OPENVMS conference
because I am not sure which is the correct conference and customer need a reply
by our tomorrow, sorry for any inconvenience caused.


Best regards,
-Eng-


DEV NAME  VOLUME       TOTAL     ALLOC    FREE BR  FREE RPT  %      DIFF  ERR
--------  ------       -----     -----    -------  -------- ---     ----  ---
DSA204    RTR_SYS1    8378028   4447872   3930156   3891303  46     38853  0 *
DSA631    RTR_SYS2    8378028   2430297   5947731   5947677  70        54  0
DSA250    RTR_USERS   8378028   3899412   4478616   4478661  53       -45  0
DPA500    RTR_DB1    50188312  36932427  13255885   9096556  18   4159329  0 *
DPA600    RTR_DBB1   16732792   7455095   9277697   6871315  41   2406382  0 *
DPA610    RTR_DB2    16732792    346885  16385907  16385909  97        -2  0
DPA611    RTR_DBB2   16732792    178721  16554071  16554073  98        -2  0
DSA205    RTR_DB3     8378028   4673529   3704499   3704499  44         0  0
DSA630    RTR_DB4     8378028       432   8377596   8377596  99         0  0
-----------------------------------------------------------------------------
Total of 10 disk device(s) reported.



A1RTR1-CSM> sh dev dpa

Device                  Device           Error    Volume         Free  Trans Mnt
 Name                   Status           Count     Label        Blocks Count Cnt
DPA0:         (A1RTR1)  Online               0  (remote access)
DPA500:       (A1RTR1)  Mounted              0  RTR_DB1        9271094   102  2
DPA600:       (A1RTR1)  Mounted              0  RTR_DBB1       7007281     1  2
DPA610:       (A1RTR1)  Mounted              0  RTR_DB2       16385909     2  2
DPA611:       (A1RTR1)  Mounted              0  RTR_DBB2      16554073     1  2

A1RTR1-CSM> sh dev dpa500 /full

Disk DPA500: (A1RTR1), device type RAID0 Disk Array, is online, mounted, file-
    oriented device, shareable, available to cluster, error logging is enabled.

    Error count                    0    Operations completed          180054726
    Owner process                 ""    Owner UIC                      [SYSTEM]
    Owner process ID        00000000    Dev Prot            S:RWPL,O:RWPL,G:R,W
    Reference count              114    Default buffer size                 512
    Total blocks            50188312    Sectors per track                   255
    Total cylinders              772    Tracks per cylinder                 255
    Allocation class             256

    Volume label           "RTR_DB1"    Relative volume number                0
    Cluster size                  49    Transaction count                   117
    Free blocks              9271094    Maximum files allowed            501883
    Extend quantity                5    Mount count                           2
    Mount status              System    Cache name           "_DSA100:XQPCACHE"
    Extent cache size             64    Maximum blocks in extent cache   927109
    File ID cache size            64    Blocks currently in extent cache 896308
    Quota cache size               0    Maximum buffers in FCP cache       2270
    Volume owner UIC           [1,1]    Vol Prot    S:RWCD,O:RWCD,G:RWCD,W:RWCD

  Volume status:  subject to mount verification, do not unload on dismount,
      write-back caching enabled.
  Volume is also mounted on A1RTR2.


A1RTR1-CSM> dir dpa500:[000000...] /size/grand

Grand total of 4 directories, 138 files, 36705298 blocks.

    

   If you have a time-critical answer, you should raise an IPMT.

   On DPA500:, SHOW DEVICE reports 50,188,312 total blocks and free blocks
   of 9,271,094 -- meaning a current usage of around 40,917,218 blocks.
   This does not closely match the 36,705,298 block value returned by
   DIRECTORY/SIZE.   (It's off by 4,211,920.)

   In addition to the ANALYZE/DISK, also run a pass of ANALYZE/DISK/REPAIR
   and SET VOLUME/REBUILD=FORCE on the target disk.  The DIRECTORY/SIZE and
   (better) the DIRECTORY/SIZE=ALL commands can misreport the amount of
   actual usage.  Particularly around hidden files and alias entries...

   SHOW DEVICE has had a history of being potentially incorrect, and this
   is often cleared by a disk rebuild or a reboot -- the value in memory
   does not necessarily reflect the actual usage.  (There have been a few
   workarounds discussed over time, and there have been some changes made
   to better track the cases where there were accounting problems.  See
   126.* for one previous discussion...)

Check for files which have been deleted but are still open. They won't show
up in the directory but still take up space. Check with 'SHOW DEV/FILES'

Jur.