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callmanager upgrades

whats the opinions on how upgrades re handled.

we have a pub & 2 subs on 4.1.2, and need to upgrade to support some devices that are not available on the current system. i.e. ATA 188, 2801 Router 7941/7961 handsets.

I realise the device packages can be added fairly easy, however as we're on 4.1.2 a few releases behind, I feel that an upgrade is probably due.

However whats putting me off is the time involved in the proceedure, i.e. from what I see I need to upgrade OS, & sql as well as the ccm software.

Our maintainer who I could ask to do this, wants about 1.5 days per server, which seems excessive to me and when its three servers thats taking a lot of time.

How does anyone else schedule upgrades, comments please.

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Re: callmanager upgrades

i've done an 8 server cluster in 24 hours, so 3 servers should take no more than 9 hours. (if you don't have any show stopping errors/issues)

definately can be done in a business day plus a bit of overtime. (or after hours which is better for the users in most cases)

must be done one server at a time, especially during the synchronizing the CCM030x database process. (publisher first then one subscriber at a time)

be sure to follow disaster recovery steps such as performing a BARS backup before starting, pulling an HDD of a RAID/Mirror set, etc.

also, have all the disks, SRs, patches, data ready to go. all these are stated in the step-by-step upgrade instructions.

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