Ken

From what I gleemed from what you did:

1. Pulling out or pushing in a drive into the  HASS will trigger a bus reset
which
    will take 30-45 seconds. Doing that back to back will cause two bus
resets
    that will exceed the 80-105 second timeout value for detecting a
disabled
   mirror.

2.  Pulling out a drive when no I/Os are pending will not trigger a disabled
mirror.
     We have to do an I/O where one of the pair of I/Os timesout to trigger
a mirrored
     disabled sequence.

3. Without letting MPE settle down before each of the events that you did
might (will)
    expose problems ouside of my direct influence, And I hate that.

(Happy Mirroring)

Walt


Sletten Kenneth W KPWA <[log in to unmask]> wrote in message
news:91396s0r46@enews1.newsguy.com...
> Last Saturday in part I said (but message did not get delivered
> to my in-box until five minutes ago today (we may have had
> internal email server problems over the weekend) ):
>
>
> > (2)   The main "event":  After pulling out initial LDEV 75, .....
> >
> > About this time an error message I have never seen before
> > ......
> > "VOLUME MIS-MATCH ON LDEV 75:  REMOUNT PREVIOUS
> > VOLUME".....
> >
> > O.K....  I see that REBUILD of LDEV 74 just completed... ....
> > .....
> > How do I get LDEV 75 to switch from BUSY to DISABLED;
> > very preferably WITHOUT having to REBOOT....  TBD...
>
> All is well (and guess I can live without knowing just how I got
> LDEV 75 stuck in DSTAT "BUSY" for such a long time):
>
> I swapped the original spindle back into the LDEV 75 slot.
> After the usual short interval for the disc to spin up, DSTAT
> for that LDEV changed from "BUSY" back to normal.  Then I:
>
> (1)   Pulled the original LDEV 75 spindle back out again.
> (2)   Issued a BUILD command for LDEV 75.  Waited until
>         got prompt back (took maybe 45 seconds or so).
> (3)    Verified new file now existed on mirror LDEV 55.
> (4)    Waited maybe another 30 seconds or so;  at which
>         point DSTAT for LDEV 75 showed "DISABLED".
> (5)    Swapped in new spindle in LDEV 75 position;
>         REPLACEMIRRVOL;   all was well.
>
> Only thing I can think of where I might have contributed to
> things getting temporarily hosed is that I'm pretty sure I hit
> <BREAK> on my first attempt to change file on LDEV 75
> (when the original spindle was pulled out);   since I seemed to
> be stuck and not getting the prompt back for longer than I
> thought was reasonable.
>
> Possible moral of the story:  When a mirror spindle is not
> available, have a little patience when issuing commands which
> would change that spindle if it was up.  There seems to be a
> considerable additional delay getting the prompt back when
> one spindle is down or out.....
>
> Residual question for mirror disc experts (hello Walter ??):
> Any general or specific statement that can be made about
> system response time when MirrorDisc/iX detects that one
> side of a mirror pair is not available;  both before and after
> you answer the "CONFIRM MIRROR DISC DISABLED"
> message on the CONSOLE ??
>
> thanks,
> Ken Sletten
>