[Info-vax] inconsistent information about HBVS status

[Phillip Helbig---undress to reply]

I had a DEC 3000 in my cluster freeze up today (if all goes well, I will 
have moved from 2 VAXen and 1 old ALPHA to 3 newer ALPHAs by this time 
next week), I don't know why.  It froze.  I had to do CTRL-P to get to 
the console.  Everything left OK.  BOOT hung soon after it rejoined the 
cluster.  Back to the console, TEST, and then it booted normally.  Maybe 
it's just getting old.

Anyway, as a result of this, some merges and copies started.  I used my 
DCL procedure (see below) to check the status, and was surprised that 
SHOW DEVICE shows

Device                  Device           Error    Volume         Free  Trans Mnt
 Name                   Status           Count     Label        Blocks Count Cnt

DSA520:                 Mounted              0  SOFT            514653     2   3
$22$DKA200:   (DANEEL)  ShadowSetMember      0  (member of DSA520:)
                                                (copy trgt DSA520:   0% copied)

while SHOW SHADOW shows

   _DSA520:  Volume Label: SOFT
     Device $22$DKA200             Master Member
     Device $33$DKB0               Copy Target (1%)

Presumably, the low-level information is obtained from the same sources,
ultimately, in both cases.  Why the difference?  It can't be rounding 
(unless it is very bad rounding) since the copy has definitely not 
started yet.

Any ideas?

This is 7.3-2.  It would be interesting to see if it is still the same 
on later versions/patch levels.

My latest patches are

DEC AXPVMS VMS732_SYS V18.0          Patch       Install         15-JUL-2009
DEC AXPVMS VMS732_UPDATE V19.0       Patch       Install         15-JUL-2009

I have a few more I got before access was cut off which I haven't
installed yet.  (Plans are to upgrade my hardware, patch 7.3-2 (one node
at a time), rolling upgrade to 8.3, patch 8.3 with the patches I got
before access was cut off.)

Here's the full output of SHOW SHADOW:

_DSA520:  Volume Label: SOFT
  Virtual Unit State:   Copy Pending (1%)
  No Enhanced Shadowing Features in use

  VU Timeout Value      3600    VU Site Value          0
  Copy/Merge Priority   5000    Mini Merge      Disabled
  Recovery Delay Per Served Member                    30

  Device $22$DKA200             Master Member
    Read Cost            501    Site 0
    Member Timeout       300

  Device $33$DKB0               Copy Target (1%)
    Read Cost              2    Site 0
    Member Timeout       300

---------8<--------------------------------------------------------------------

$  SHOW DEVICE DS
$  PIPE SHOW DEVICE DK/MOUNT | SEARCH SYS$PIPE ":"
$  WSO ""
$  WSO ""
$  READ/PROMPT="Members: " SYS$COMMAND DUMMY
$! ALPHA-only!
$  PIPE SHOW SHADOW | SEARCH/NOWARNINGS SYS$PIPE Volume,Device | -
    CONVERT  SYS$INPUT: SYS$OUTPUT
$  WSO ""
$  READ/PROMPT="Members: " SYS$COMMAND DUMMY
$  PIPE SHOW DEVICE DS | SEARCH/NOWARNINGS/MATCH=NAND SYS$PIPE ":"
$LOOP:
$  D = F$DEVICE("_DSA*","DISK")
$  IF D .EQS. "" THEN EXIT
$  PIPE SHOW DEVICE 'D' | SEARCH SYS$PIPE ":"
$GOTO LOOP
$  EXIT