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Using the Memory Machine Management Center
Memory Machine Management Center (M3C) is a web UI application available on the host that is running the Memory Machine Management Service. You can view system resources and performance metrics; create and restore snapshots; schedule jobs; and more in M3C.
Using Snapshots in Memory Machine Management Center
Use ZeroIO Snapshot from Memory Machine Management Center to capture the state of a running process. You can then stop the process and restore it to the running state captured in the snapshot.
Viewing Snapshots
View snapshots graphically, in a tree structure, or as a sortable list in the Snapshot Display Panel.
Snapshot Statuses
A snapshot has four possible values with respect to its persistence status: Incomplete, Created, Persisted and Error.

Overview and Installation
Understanding how persistent memory works is helpful when getting started with MemVerge Memory Machine. You can then install Memory Machine on a server and begin monitoring memory usage and capturing application snapshots.
Using the Memory Machine Management Center
Memory Machine Management Center (M3C) is a web UI application available on the host that is running the Memory Machine Management Service. You can view system resources and performance metrics; create and restore snapshots; schedule jobs; and more in M3C.
- Getting Familiar with the Memory Machine Management Center
  Memory Machine Management Center (M3C) is a web-based user interface (UI) from which an administrator can view memory and processor statistics and capture and restore application snapshots on any number of servers under management by Memory Machine.
- Managing Hosts
  Use the Hosts Console to manage hosts and to view statistics about application instances, memory performance, and snapshots on individual hosts and host groups.
- Managing Applications
  You can view application instances from the Applications Console. Application instances must be started and stopped using the command line.
- Using Snapshots in Memory Machine Management Center
  Use ZeroIO Snapshot from Memory Machine Management Center to capture the state of a running process. You can then stop the process and restore it to the running state captured in the snapshot.
  - Managing Memory Machine Snapshots
    Capturing a snapshot is almost instantaneous, requiring only that a small amount of metadata be saved to a storage device.
  - Cloning a Snapshot with Memory Machine Management Center
    To clone a snapshot of an application, use the All Actions Dropdown in the Applications Console.
  - Exporting and Importing Snapshots
    You can export snapshots from Memory Machine to an unmanaged file system, then later restore the snapshot to the same or a different host.
  - Replicating a Snapshot
    Click a snapshot in the Applications Console to replicate a snapshot to a different host.
  - Viewing Snapshots
    View snapshots graphically, in a tree structure, or as a sortable list in the Snapshot Display Panel.
    - Viewing Snapshot Lineage
      Capturing and restoring snapshots of an application instance can create a complex tree of snapshots with multiple branches. You can view this tree in the Snapshot Display Panel.
    - Snapshot Statuses
      A snapshot has four possible values with respect to its persistence status: Incomplete, Created, Persisted and Error.
- Viewing Metrics and System Status
  The Memory Machine Management Center makes it easy to view and compare running processes, snapshots, system resources and performance metrics.
Using the Command Line Tools
You can administer and use MemVerge Memory Machine using a Command Line Interface (CLI).
Memory Machine Administration
MemVerge Memory Machine can be installed and run using CLI commands. Many administrative tasks can be performed using the Memory Machine Management Center web interface.
Working with Applications
MemVerge provides additional instructions for some popular applications supported by Memory Machine, either to assist with complex setup or to support additional functionality.

Snapshot Statuses

A snapshot has four possible values with respect to its persistence status: Incomplete, Created, Persisted and Error.

Snapshot Creation

A snapshot consists of two components that combine to represent the "frozen" process. The first component is the memory state data, which resides in PMem and is managed by the MemVerge Memory Allocation Service (MVMAS).

The second component can be thought of as metadata. This is all the data that isn't represented by the state of memory. This includes file descriptors, address space indexes, mount points, and more. The metadata resides in a conventional (non-PMem) file system. This can be a local drive, an NFS mount, or any other file system not managed by MVMAS.

A snapshot is captured by performing these operations, in order:

Metadata is copied to the Memory Machine data directory. See The Memory Machine Configuration File.
Memory state data that is not yet in MVMAS-controlled PMem is flushed to PMem. This is typically data in the DRAM tier memory.

Snapshot Status Values

The following are possible statuses with respect to the snapshot creation process. See Snapshot Creation.

Incomplete: Metadata has been saved, but memory state data is missing. This can happen if PMem maintained by MVMAS is forcibly erased. It can also happen in the moment when a snapshot is being moved to a new host.

Created: The snapshot metadata is saved and the memory state data is complete but is still being flushed to PMem. The snapshot can be restored at this point, but if the server loses power (or is restarted), the snapshot is ruined.

Persisted: Metadata has been saved and memory state data is contained entirely in PMem managed by MVMAS. The snapshot can be restored and is safe from server power interruptions.

Error: This indicates an error when Memory Machine queries the state of the snapshot. For example, the connection to the MVMAS could be lost as the query is being sent. The snapshot is not necessarily lost, but it is not currently available.