When the cutover changed.
I led outage planning, cutovers and health checks for a three-week Hyper-V to VMware migration.
21 VMs
Three physical hosts to two.
3.5 TB
Total server storage across five drives.
~6 hours on paper
Converter pre-scan locked the database at about 20%. The production application became unavailable.
An uncertain release
Lose scan progress with no guarantee the database lock releases.
Reconcile later
New orders would need merging. The DBA identified a risk of missed orders.
Complete the migration.
With the site manager and DBA, we adjusted settings and continued. The service returned; skipping the re-scan shortened the overall process by about four hours.
- Next: rebuilt two smaller database servers rather than converting them.