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 >