vSAN Health Service - Physical disk - Component limit
Article ID: 331488
Updated On:
Products
VMware vSAN
Issue/Introduction
This article explains the Physical disk - Component limit check in the vSAN Health Service and provides details about why it might report an error.
Environment
VMware vSAN 6.2.x
Resolution
Q: What does the Physical disk - Component limit test do?
This test verifies that the number of vSAN components on the disk has not exceeded the components per disk limit.
Note: As of vSAN 8.0 it verifies both the data component and metadata component limit on the disk when vSAN ESA is enabled.
Q: What does it mean when it is in an error state?
If the test returns a warning or error, it means that the number of vSAN components on the disk has reached its limit. Once the components per disk limit has been reached, the deployment of new virtual machines fails, and rebuild operations cannot be completed.
Since the disk component limit is higher than the host limit of a regular vSAN host, this error only occurs in the witness node when the stretched cluster is configured. If all disks in the witness host have reached the maximum disk component limit, it will fail to create vSAN objects, such as VMDK provisioning.
These are the thresholds at which warnings and errors are displayed for this health check:
To troubleshoot this issue, add additional disks to the witness node, as long as you do not reach the witness node component limit. For more information about the host component limit, refer to KB 2146130.
This test verifies that the number of vSAN components on the disk has not exceeded the components per disk limit.
Note: As of vSAN 8.0 it verifies both the data component and metadata component limit on the disk when vSAN ESA is enabled.
Q: What does it mean when it is in an error state?
If the test returns a warning or error, it means that the number of vSAN components on the disk has reached its limit. Once the components per disk limit has been reached, the deployment of new virtual machines fails, and rebuild operations cannot be completed.
Since the disk component limit is higher than the host limit of a regular vSAN host, this error only occurs in the witness node when the stretched cluster is configured. If all disks in the witness host have reached the maximum disk component limit, it will fail to create vSAN objects, such as VMDK provisioning.
These are the thresholds at which warnings and errors are displayed for this health check:
- Green (OK) - 75%
- Yellow (Warning) 75-95%
- Red (Danger) - Higher 95%
To troubleshoot this issue, add additional disks to the witness node, as long as you do not reach the witness node component limit. For more information about the host component limit, refer to KB 2146130.
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