I have two 7825-H1 MCS servers with Callmanager software running. I intend to perform some upgrades on these servers and I would like to know the procedure for taking out one of the drives, upgrading and then replacing the drive again.
1. Which drive should be taken out?
2. Assuming the upgrade goes according to plan and I replace the removed drive will it sync with the intstalled drive?
3. Is there any danger of the non upgraded drive becoming the "master" and effectively down grading the system again?
4. If the upgrade fails and I have to boot on the old disk will replacing the upgraded disk down grade it?
The Cisco MCS 7825-H1 is configured with two 80GB serial advanced technology attachment (SATA) "cold-pluggable" disk drives configured in a RAID 1 mirror set. The server continues to operate if either of the two disk drives fails. The SATA disk drives are accessible to the end user through openings in the front bezel of the server. If a drive fails, the end user can schedule server downtime, power down the server, and replace the failed SATA drive by simply removing it (each drive is equipped with a front latch that positively mates the drive to the server) and replacing it with an un-configured spare drive. After restarting the server, the RAID 1 firmware initiates a re-mirroring of the new drive to ensure that drive redundancy on the Cisco MCS 7825-H1 is maintained.
You can replace cold pluggable drives when the power is OFF. Assume, for example, that you are about to do an upgrade on your Cisco CallManager system. As a precaution, you take disk 1, ID 1 out of the array. You perform the upgrade on disk 0, ID 0. The upgrade fails.
This procedure outlines the steps to take in order to go back to the original configuration (disk 1).
Bring the server down.
Take disk 0, ID 0 out of the server.
Insert disk 1, ID 1 with the good configuration into the array.
Boot the server with this disk.
At the bootup window, press F2: "Interim Recovery mode will be enabled if configured for fault tolerance".
Note: Always place the disk in the slot from which you have removed the disk.
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