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<div>The one piece of advice I can give you that applies in all cases is to be mindful of your phone firmware. When upgrading, or in events where you have to roll back, its nice if you already have the new version's default firmware loads installed on your
old cluster, or you hard code the firmware (even if temporarily) running on your old cluster into the device firmware load so that it doesn't upgrade phones after CUCM version upgrades.</div>
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<div>By the look of your cluster, you probably have thousands of phones, the need for incredibly high uptime, or both. I find it is best to worry about firmware upgrades one device pool at a time either before the upgrade, or after the upgrade. Upgrading
the CUCM version and then testing is troublesome enough without that :)</div>
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<span style="font-weight:bold">From: </span>Frank Arrasmith <<a href="mailto:frank.arrasmith@gmail.com">frank.arrasmith@gmail.com</a>><br>
<span style="font-weight:bold">Date: </span>Fri, 2 Mar 2012 16:22:22 -0800<br>
<span style="font-weight:bold">To: </span>cisco-voip <<a href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a>><br>
<span style="font-weight:bold">Subject: </span>[cisco-voip] Upgrade Methods<br>
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<div>Hey all,<br>
I have a quick question about best practices/tips during system upgrade, particularly on the Linux appliance models. My previous experience with upgrades has been primarily in a lab, which have always gone fine, However, in my new enterprise, we have an
8 server cluster(pub,5 subs, 2 tftp) running 7.1.5, with critical uptime requirements. Other than recommended procedures from the Cisco Upgrade guides, what other practices or additional procedures do you employ to ensure a smooth upgrade, and/or to speed
the process along? <br>
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1. Do you upgrade all in one shot, long maintenance window? Install, Reboot , Test?<br>
2. Do you do spread out the install over a few days? Install over a few maintenance windows utilizing inactive partitions, then schedule restart and testing for another maintenance window? how long of a time period is it acceptable to spread out?<br>
3. Other then basic call testing, and ensuring that appropriate services are started/running( we distribute service between the subs), what other checks do you include?
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<div>Thanks in advance.<br>
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<div>Frank Arrasmith</div>
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