Here is a walk through with screenshots:

https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/118948-technote-cucm-00.html

> On Aug 23, 2018, at 11:36, Charles Goldsmith <[email protected]> wrote:
> 
> Recovery disks are used when your CUCM won't boot or you can't login.  There 
> is a file repair utility, as well as a password reset utility, plus something 
> else I don't remember.  It has 4 options on the menu.  In the lab, I've also 
> used it to get into the system as root and mount the partitions, used it to 
> delete logs that were filling up from that nasty vmtools bug we had about a 
> year ago.
> 
> You can probably mount that ISO into an empty VM and boot it to see it.
> 
>> On Thu, Aug 23, 2018 at 10:43 AM Lelio Fulgenzi <[email protected]> wrote:
>> 
>> Our disaster recovery plan has always been boot with disk/ios image and 
>> restore from latest backup. We’ve tested this on a few occasions and it 
>> works well. Well, as good as documentation can be expected.
>> 
>> We typically try to do this as quickly as possible after an upgrade to 
>> ensure the bootables we have work and we have the appropriate inline upgrade 
>> ISO images. We get the bootables through PUT when required and the upgrades 
>> through CCO software downloads. We usually also try to get the bootables 
>> published by the TAC for us. For example, PUT only has v11.5(1)SU3b 
>> bootables, not SU4.
>> 
>> The question is… what scenarios are the recovery disks used for? Have people 
>> used those? Have they worked?
>> 
>> For some reason, I’m flashbacking to wordperfect recovery software that 
>> never recovered a single file. 😉
>> 
>> 
>> 
>> ---
>> Lelio Fulgenzi, B.A. | Senior Analyst
>> Computing and Communications Services | University of Guelph
>> Room 037 Animal Science & Nutrition Bldg | 50 Stone Rd E | Guelph, ON | N1G 
>> 2W1
>> 519-824-4120 Ext. 56354 | [email protected]<mailto:[email protected]>
>> 
>> www.uoguelph.ca/ccs<http://www.uoguelph.ca/ccs> | @UofGCCS on Instagram, 
>> Twitter and Facebook
>> 
>> [University of Guelph Cornerstone with Improve Life tagline]
>> 
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