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Monitoring Physical Disks

The S.M.A.R.T. status of physical disks is monitored by the smartctl tool installed along with Parallels Cloud Server. The tool is run every 10 minutes as a cron job also added during Parallels Cloud Server installation. The smartctl tool polls all physical disks attached to Hardware Nodes in the cluster, including caching and journalling SSDs, and reports the results to the MDS server.

Note: For the tool to work, enable the S.M.A.R.T. functionality in Node's BIOS.

You can view disk poll results for the last 10 minutes in the output of the pstorage top command. For example:

If the SMART warning message is shown in the main table, one of the physical disks is in pre-failure condition according to S.M.A.R.T. Press d to switch to the disks table to see more details. For example:

The disks table shows the following parameters:

Parameter

Description

DISK

Disk name assigned by operating system.

SMART

Disk's S.M.A.R.T. status:

  • OK : The disk is healthy.
  • Warn : The disk is in pre-failure condition.

Pre-failure condition means that at least one of these S.M.A.R.T. counters is nonzero:

  • Reallocated Sector Count
  • Reallocated Event Count
  • Current Pending Sector Count
  • Offline Uncorrectable

TEMP

Disk temperature in Celsius.

CAPACITY

Disk capacity.

SERIAL

Disk serial number.

MODEL

Disk model.

HOST

Disk's host address.

Note: To disable S.M.A.R.T. disk monitoring, delete the corresponding cron job.

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