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2018-07-12

Mediatrix Units Using a Virtual Machine

v. 42.3.986


1 SSD Lifespan

Mediatrix units running a Virtual Machine are equipped with various sizes of Solid State Drive (SSD) for storage.

A Solid State Drive (SSD) is a form of flash-based storage. Media5 uses high quality, enterprise grade SSDs in its products. However due to its technical nature, flash memory can handle so many read/write cycles. Beyond that, the performance may degrade or in extreme cases, the drive may fail. For customers using a Mediatrix unit running a Virtual Machine, special attention should be paid to the number of writes caused by the Operating System running in the virtual machine, as well as by the application. If the Virtual Machine is not optimised, it will lead to excessive read/write access to the SSD, and hence significantly reduce the lifespan of the SSD. For more details, please refer to our virtual machine installation technical bulletins published on our Documentation Portal .


2 SSD Lifespan Extrapolation

SSD lifespan can be extrapolated and Virtual Machine optimisation can be validated.

For example, let the virtual machine run for a month (or a week), read and compare the WearPercentage parameter at different times during this interval. Use the collected information to extrapolate the lifespan.

For example: the Wear Percentage increased from 19% to 20% in 2 months. Take the remaining 80% divided by a monthly increase of 0.5% gives 160 months left. Therefore at least 13 years left at the current increase rate.

If the lifespan does not meet the expectations, you may consider further optimisation measures e.g.:

  • disable some of the logging
  • log to an external device
  • assign more RAM to the Virtual Machine
  • consider ordering a bigger SSD for future installations


2.1 Monitoring the SSD Wear Percentage Using the CLI

Steps

  1. Open the Command Line Interface ( CLI).
  2. At the prompt, enter the following command: Dcm.PersistentWearPercentage

Result

This parameter will provide the Wear Percentage of the SSD. It is taken from the SMART data obtained directly from the drive. When it reaches 100%, it means the technical lifespan of the SSD has been reached. The drive may not fail immediately, but this indicates that the SSD must be replaced to ensure continuous operation.

2.2 Monitoring the SSD Wear Percentage Using a MIB Browser

Context

The Mediatrix UMN Mib browser can be used for this procedure.

Steps

  1. Open your Mib Browser.
  2. Poll .1.3.6.1.4.1.4935.1000.100.200.100.2000.1.10000.100.250

    Note

    This is an SNMP (readonly) Mib.

Result

This parameter will provide the Wear Percentage of the SSD. It is taken from the SMART data obtained directly from the drive. When it reaches 100%, it means the technical lifespan of the SSD has been reached. The drive may not fail immediately, but this indicates that the SSD must be replaced to ensure continuous operation.