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Chapter 8. Monitoring Red Hat Hyperconverged Infrastructure for Virtualization

8.1. Monitoring Virtual Data Optimizer (VDO)
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Monitoring VDO helps in understanding when the physical storage is running out of space. Physical space in VDO needs to be monitored like thin provisioned storage. VDO devices should use thin provisioning because more logical space will be available and VDO space will be used in a more effective way. By default thin provisioning is enabled and it can be unchecked as required.

You can check available blocks, used space, and device information by clicking on View Details.

8.1.1. Monitoring VDO using the command line interface
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There are several options for monitoring VDO using the command line interface.

The vdostats command
This command displays volume statistics including available blocks, number of blocks used, device name, percentage of physical blocks saved, and percentage of physical blocks on a VDO volume. For more information on vdostats, see the manual page: man vdostats.
The vdo status command
This command reports VDO system and volume status in YAML format.
The /sys/kvdo/<vdo_volume>/statistics directory
Files in this directory include volume statistics for VDO. You can read these files instead of using the vdostats command.

8.1.2. Monitoring VDO using the Web Console
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Events related to VDO usage are displayed under the Notifications tab. Events provide information about the physical space remaining on the VDO volume, and keep you up to date about whether more physical space is needed.

Expand
Table 8.1. Types of Event Notification
TypeTextActions

Warn

Warning, low confirmed disk space. StorageDomainName domain has DiskSpace GB of confirmed free space.

  • Delete data that is not required.
  • Replace existing disks with larger disks.
  • Add more Red Hat Gluster Storage servers and expand the volume across the new servers.
  • Add more disks and expand the logical volumes underlying the Gluster volume.
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