RAID array degraded
One or more disks have failed in an mdadm software array or a hardware RAID controller (Dell PERC, LSI/Broadcom MegaRAID, HPE Smart Array, Adaptec). One more failure may cause data loss.
Remediation
When this rule fires on one of your servers, the dashboard alert detail page renders the full remediation guidance: the command to run, what to verify after, and Furnace's annotation for your specific distro + hardware. Sign in at app.glassmkr.com to see the live alert.