Walt replied to the list, RE my: > Mirror Disc factoids; and stuck in "BUSY"... > > 1. Pulling out or pushing in a drive into the HASS will > trigger a bus reset which will take 30-45 seconds. I was pretty much on track that far... > .... Doing that back to back will cause two bus resets > that will exceed the 80-105 second timeout value for > detecting a disabled mirror. AH HA !!... now it becomes clear.... thank you for explanation.... > 2. Pulling out a drive when no I/Os are pending will not > trigger a disabled mirror. That's reasonable; if there isn't anything that needs to use it at the moment, unless you did regular polling to generate pretty constant low-level disc activity (doesn't sound like a good idea), how would MirrorDisc know it was gone.... > 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) Been mirroring for just over five years now: Have never lost a mirrored spindle (started with 10; up to 20 now); had only three or four mirror DISABLED events I did not deliberately cause during that time, IIRC..... We be happy mirroring campers... :-) hmmm..... while have it in mind: Walter or anyone care to comment on latest revisit of poor-man's mirroring the MPEXL_SYSTEM_VOLUME_SET (since IIRC one the key sticking points if HP was ever going to try and mirror the <long_name> was deciding which spindle to go to during BOOT-up)... I know HP sez no plans to implement mirroring of SYS_VOL; but humor me for a bit: At the ISL prompt you have a chance to change PRIMARY boot path. If mirroring could handle keeping SYS_VOL mirrored while up and running, how about: (1) One or more spindles in SYS_VOL blows up: CRASH. (2) You attempt to BOOT in SINGLEDISC mode. IF that works, LDEV 1 is (probably) O.K.; it's one of the other spindles in the SYS_VOL. While booted in SINGLEDISC mode, you are (by some STM magic or etc. that we won't worry about right now) able to determine which other LDEV in SYS_VOL has gone south. Even if I had to switch the bad "non-LDEV 1" member of the SYS_VOL to a mirrored sibling LDEV manually while booted in SINGLEDISC mode, I would be happy if I could do that.... or at least: Happy enough. (3) If attempt to boot in SINGLEDISC mode does NOT work, then (assume) LDEV 1 is bad. Change PRIMARY boot path at ISL prompt; reboot; pull out the failed LDEV 1 hot-swap module; stick in a new spare; let mirror resync while up and running; buy another hot spare; all is well.... Could something like the above make is sufficiently "easier enough" that HP *might* re-consider that level of mirroring the system volume ??... Right now to get back up if any spindle in the SYS_VOL fails I've still got to figure out which drive failed; *AND* do an INSTALL of entire SYS_VOL. Something like the above would allow skipping the INSTALL. BTW: Did I say MirrorDisc is a great product; some kind of SYS_VOL assist is the only key missing feature ??... :-) I know a few sites have posted to the list about problems with frequent DISABLED mirror spindles or etc.... all I can say is sure has been running well for us for 5+ years.... Ken Sletten