"Hello,
We have a MD3200i and 2 MD1200 trays. We have created 6 RAID 6 disk sets with two disks on each unit. I now need to power off all three trays but I'm not sure how that will affect the arrays. Is there an order to powering off the disk trays. or a maintenance mode I can envoke before powering off to prevent data loss. Any hints would be greatly appreciated.
Cheers
Eck"

You would want to power off the MD3200i containing the RAID controllers first. This will give the controllers a chance to save any uncommitted data to non-volatile memory and/or disk if transfer is in progress. Powering off the MD1200's in your configuration first could fail the disk group, as seen from the controller, so would be inadvisable. So the process to be robust would be to power off the MD3200i first, wait for the LED's on the RAID controllers to turn off, then power down the MD1200's. The power on process would be in the opposite order, MD1200's first then MD3200i last.

Cheers for that Bobs-Dell. So I take it there is no way to power off the units from the management software? So to power off I would just flick the switches on the PSU's of the MD3200i first, wait then do the MD1200's after that?
Cheers again,
Eck

That is correct. The MD3200i does not have a remote power off command function.
I did not mention it however it is always best to quiesce all host applications (and power down server O/S's if possible) first before powering down storage subsystem. That would help ensure a clean shutdown and minimize risk for your whole solution.

Thanks for the help Bobs-Dell, it all went down fine, and more importantly, came back up fine!
Cheers
Eck

Outstanding! Helping make you a success is what we're here for !