unity is on a mcs7825-h2 server. Will be upgrading unity and want to remove a drive and replace with a new spare drive before starting, keeping the removed drive on shelf in case of total failure.
Have been reading the links on this but am still unsure of the procedure to follow;
first step - which drive do I remove, 0 or 1?
is this done while server is running or off?
is the new, spare drive added in place of the removed one, while server is running or down?
How do I determine when mirroring is done? do i need to install HP array software?
In event of upgrade failure, what is procedure to return to old version?
which drive do I add the original disk to, 0 or 1?
Do i leave a drive in the other bay or bring up server with just the one drive?
when 2nd drive is added, is server running or down?
Here is what I do:
Shutdown the server.
Pull drive 0 out and label it Drive 0
Pull drive 1 out and label it Drive 1
Insert Drive 1 into Slot 0 where drive 0 came from.
Let Unity boot up. If it works, then your backup drive is drive 1.
Shut down the server, remove Drive 1 from Slot 0.
Insert Drive 0 back into Slot 0 and boot up Unity. If Unity boots correctly, insert your spare drive into Slot 1. Let the Mirror rebuild itself (HP utility will tell you it has completed, usually in about 40 minutes)
Now you can start your upgrade process.
If the upgrade fails, you can shut down the server, pull both drives, insert the backup drive into slot 0 and you are back in business.
Remember, you must run through the tests to make sure the drive mirrors have been working. I have seen Unity servers where the Mirror was never setup to begin with.