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Data Disk Mode

Data Disk Mode, often shortened to DDM, is one of the most important technical notions exposed publicly by TRINITY.

What DDM means

DDM is a maintenance-oriented VM mode. The goal is not to present the environment as a normal application runtime, but as a controlled context for checking data, storage and system state.

In practice, DDM is useful when the user or support needs to:

  • Inspect a disk
  • Verify filesystems
  • Recover data
  • Confirm that a broken environment can still be mounted
  • Work on a service that should not boot normally yet

How to recognize DDM

The interface usually makes DDM explicit through labels and a console layout dedicated to recovery or maintenance.

Normal service mode:
  service first
  application behavior expected

Data Disk Mode:
  storage and system first
  recovery behavior expected

Safe DDM checks

The first actions in DDM should stay conservative.

hostname
lsblk
findmnt
df -h
cat /etc/fstab

These commands help answer simple questions:

  • What disks are visible
  • What is mounted
  • How much space remains
  • Whether the expected filesystem is present

Typical DDM workflow

Enter DDM
  -> identify disks
  -> confirm mounts
  -> inspect filesystem
  -> collect evidence
  -> recover data or prepare support escalation

What DDM is not

DDM should not be read as:

  • A normal application success state
  • A replacement for backups
  • An invitation to make uncontrolled system changes

DDM is a controlled technical mode whose value is clarity, recovery and inspection.