After a power outage the server boots but a VM or database is corrupt.
UPS shuts down cleanly, but if journaling can not flush write-cache you still get damage. The signal cable or host agent is often missing.
Try this first
- 1Verify the UPS agent talks to the hypervisor or host
- 2Test scheduled shutdown by simulating power loss
- 3Battery runtime must cover shutdown time with margin
- 4Check RAID controller cache battery yearly
When to bring us in
Storage corrupt after every dip: write-cache without a battery-backed unit (BBU), do not rely on the UPS alone.
See also
- One DC or two DCs for an SMB office?Two is almost always the right answer; one DC is a single point of failure for logon, DNS and GPOs.
- Should I split FSMO roles across two DCs?For a small domain all on one DC is fine; with two DCs splitting is tidier but not required.
- How do I know my AD replication is healthy?Replication errors creep in silently; they only surface when logins or GPOs misbehave.
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