Source note · Planning a Unified CM upgrade
The common partition needs at least 25 GB free before upgrading. Cisco warns that an upgrade can still fail with an insufficient-space error even with 25 GB free.
Checked 2026-09-25
In some cases, even if 25GB of free space is available, upgrade may fail with the error message as insufficient space.
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- disk space
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Release 15 and SUs as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Upgrade and Migration Guide for Cisco Unified Communications Manager and the IM and Presence Service, Release 15 and SUs - Pre-Upgrade Tasks (Manual Process) — Cisco Systems · tier 2 current vendor documentation · Pre-Upgrade Tasks > Check Common Partition Available Space
Cite this note
APA
WarmTransfer. (2026, September 25). Planning a Unified CM upgrade: source note cucm-upgrade-planning-common-partition-25gb. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-upgrade-planning-common-partition-25gb
BibTeX
@misc{warmtransfer-claim-cucm-upgrade-planning-common-partition-25gb,
title = {Planning a Unified CM upgrade: source note cucm-upgrade-planning-common-partition-25gb},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-upgrade-planning-common-partition-25gb},
note = {Source note cucm-upgrade-planning-common-partition-25gb, checked 2026-09-25}
}