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Quick Tip - Retrieving vSAN usage & overhead information using vSAN API

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Within the vSphere UI, you can view a detailed breakdown of your vSAN storage utilization including various system overhead by selecting a specific vSAN Cluster and then navigating to Monitor->vSAN->Capacity as shown in the screenshot below.


Different vSAN configuration such using vSAN Original Storage Architecture (OSA) or vSAN Express Storage Architecture (ESA) and whether capabilities like vSAN Deduplication and Compression is enabled will yield different utilization metrics that are displayed.

I recently had an inquiry asking how to retrieve the vSAN Deduplication and Compression overhead information using PowerCLI?

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Quick Tip - vSAN ESA Cluster Health Check returns Error message: Expecting value: line 1 column 1 (char 0)

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A fellow colleague was having some problems with the vCenter Server Appliance (VCSA) CLI Installer when using the vSAN ESA (Express Storage Architecture) bootstrap method, which automatically the configures vSAN ESA on a physical ESXi host before deploying the VCSA on top of the vSAN ESA Datastore.


Whether he manually downloaded the vSAN JSON HCL or generated his own custom vSAN ESA HCL, the VCSA Installer would fail with the following error:

Expecting value: line 1 column 1 (char 0)

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Quick Tip - Retrieving vSAN File Share Network Permissions using vSAN API & PowerCLI

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When creating a new vSAN File Share, which is powered by vSAN File Services,  additional network access controls (no access, allow access from any IP or custom) can be configured.


To view the configured network permissions, users must expand each file share to get the relevant information. For those interesting in automating the retrieval of this information for reporting and/or compliance purposes, you can use the vSAN Management API and specifically the vSAN queryFileShares() API.

The vSAN File Share API can also be consumed through PowerCLI using the Get-VsanFileShare cmdlet, but the network permission configuration is not part of the default output which might lead users to believe this information is not available.

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