The vRealize Operations Manager collects the metrics you use to monitor the write buffer capacity of your vSAN disk groups.
A reasonably balanced system consumes a significant amount of write buffer. Before placing additional workload on the vSAN, check the write buffer metrics for the vSAN disk group.
Write Buffer|Capacity (bytes)
Write Buffer|Free (%)
Write Buffer|Usage (%)
Write Buffer|Used (byte)
Write Buffer|Reads Per Second (IOPS)
Write Buffer|Read Latency (ms)
Write Buffer|Writes Per Second (IOPS)
Write Buffer|Write Latency (ms)
The following write buffer metrics are disabled by default:
Write Buffer|Read I/O Count
Write Buffer|Write I/O Count