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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.
Using the MemVerge Memory Allocation Service
The MemVerge Memory Allocation Service (MVMAS), mvmallocd, is a service that maps programmatic memory to PMem. See oxy_ex-3/topics/a_mvmm_dpme_intro.html.
Stopping the MemVerge Memory Allocation Service
Stop the MVMAS service using the systemctl utility.

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.
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.
- Upgrading Memory Machine
  To upgrade Memory Machine, run the Memory Machine Package File on each host using the --upgrade option.
- Uninstalling Memory Machine
- Upgrading Application Dependencies
  Upgrading dependency packages for snapshotted applications may render existing snapshots of that application unrestorable.
- Understanding the Memory Machine Database
  Memory Machine Memory Machine Management Center (M3C) uses a database to store information about preferences, statistics, and configurations. You must choose a database system for M3C to use.
- Understanding the Memory Machine Software License
  You must have a valid license to run Memory Machine. The license file is read at startup by the MemVerge Memory Allocation Service (MVMAS). Without a license, MVMAS defaults to running applications using only DRAM.
- Running Memory Machine Services
  Memory Machine data services must be running to enable PMem management, snapshot operations, and connection to the Memory Machine Management Center (M3C).
- Using the MemVerge Memory Allocation Service
  The MemVerge Memory Allocation Service (MVMAS), mvmallocd, is a service that maps programmatic memory to PMem. See oxy_ex-3/topics/a_mvmm_dpme_intro.html.
  - Checking MemVerge Memory Allocation Service Status
    Use the systemctl status command to confirm the MVMAS process is running.
  - Stopping the MemVerge Memory Allocation Service
    Stop the MVMAS service using the systemctl utility.
- Resetting a Host
  Reset a host by removing all snapshot and log data and initializing the DAX devices. This erases the host's PMem.
- Reporting Tiering Statistics
  Use the mvmcli command to view information about paging activity between PMem and the DRAM performance tier for an application.
- Viewing Logs
  Examine the Memory Machine log files to troubleshoot errors – for example, to determine why a license didn't load.
- Managing Application Memory
  To manage application memory with Memory Machine, you run the application on a data host in an environment with Transparent Memory Service (TMS) and MemVerge Memory Allocation Service (MVMAS).
- Troubleshooting
- Preparing Intel® Optane™ Persistent Memory
  Prepare PMem for use by configuring the Intel Optane Persistent Memory Direct Access (DAX) devices in AppDirect mode.
- Preparing to Run an Application
  Normally you run applications by using the mm wrapper script supplied with Memory Machine. See oxy_ex-3/topics/t_mvmm_running_an_application_with_mvmm.html. If you do not use the mm to run your application, you must set up the Memory Machine environment manually before running the application.
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.

Stopping the MemVerge Memory Allocation Service

Stop the MVMAS service using the systemctl utility.

About this task

Since MVMAS is run as a service, you use the systemctl utility to start, stop, and view the status of the MVMAS process.

Procedure

Capture snapshots of any application instances that you want to restart later. See Capturing a Snapshot with CLI or Capturing a Snapshot Using Memory Machine Management Center (Advanced Edition only).
Stop all application instances currently running in MVMAS.
Shut down applications using whatever procedure is appropriate at your site. You can identify running processes by PID and kill those processes, but it's preferable to do a "graceful" shutdown of an application process if that option is available.

Note: Managed applications that are running when MVMAS is shut down cannot be allocated additional PMem capacity. PMem that has already been allocated remains accessible. Additional memory, if needed, is allocated from (non-managed) DRAM.

To stop the MVMAS service (the mvmallocd process):

# systemctl stop mvmallocd

For example:

# systemctl stop mvmallocd
● mvmallocd.service - MemVerge Memory Engine
   Loaded: loaded (/etc/systemd/system/mvmallocd.service; disabled; vendor preset: disabled)
   Active: inactive (dead)