Procedure for pulling one OS mirror on an Storage Management Appliance

[Adam Garsha]

HP recommended that I pull one of the OS mirror drives on our SMA prior to doing some maintenance work to allow for a quick fallback.

What is the procedure for this?

Shutdown SMA, pull one drive (does it matter which one?), start-up? Or pull while up? Do I have to do anything with RAID controller first? If so, what?

How do I recover? If all goes well do I just shutdown, push in the mirror and restart?

What if I want to fall back to the safe mirror and abandon changes? How do I do this?

Many thanks!

[Uwe Zessin · Accepted solution]

First, let's be clear: this is an unsupported hack!!

What I (would) do: shutdown/powerdown the server so that the data is properly written to the disk. Pull one disk - it does not matter which one. Power up.

Recovery:
power off the server, pull the corrupted disk and then plug the disk with the original data BACK IN ITS ORIGINAL SLOT!!
Power on the server and let the operating system come up. Wait a bit then then push back the disk with the corrupted data so that the RAID set is recovered. You can watch it from the ACU which is available from [Programs].

[Mark Poeschl_2]

It may be an unsupported hack, but it's one I've had three separate HP storage engineers recommend to me while doing any maintenance on an SMA. I think they all got sick of wearing out their SMA recovery CDs ;-)