VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN To display this field, hit the ‘f’ (for fields) key, and a list of all the fields that can be monitored is displayed. Next, click on the (d) to enable the monitoring of the recovery write stats. While this information is also available in the VSAN Observer, this does allow administrators a quick way of monitoring I/O activity on a per host basis. It is not available in version 5.5. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 2 6 0
Diagnostics and Troubleshooting Reference Manual – Virtual SAN Using RVC for performance monitoring There are some RVC commands that can give administrators an overview of Virtual SAN performance. Here is one such command. vsan.vm_perf_stats vsan.vm_perf_stats ~/vms/W2k12-SQL2k12 --interval 10 --show-objects output: 2014-10-31 15:19:33 +0000: Got all data, computing table +--------------------------+-------------+--------------+--------------+ | VM/Object | IOPS | Tput (KB/s) | Latency (ms) | +--------------------------+-------------+--------------+--------------+ | W2k12-SQL2k12 | | | | | /W2k12-SQL2k12.vmx | 0.3r/0.3w | 0.2r/0.2w | 0.5r/1.2w | | /W2k12-SQL2k12.vmdk | 1.2r/6.1w | 7.7r/46.5w | 0.4r/1.8w | | /W2k12-SQL2k12_1.vmdk | 0.0r/7.7w | 0.4r/1236.7w | 0.8r/1.8w | | /W2k12-SQL2k12_2.vmdk | 0.4r/647.6w | 1.6r/4603.3w | 1.3r/1.8w | +--------------------------+-------------+--------------+--------------+ By way of understanding the relationship between the metrics, the following calculations may help: IOPS = (MBps Throughput / KB per IO) * 1024 MBps = (IOPS * KB per IO) / 1024 Using VSAN Observer for Performance Monitoring One should take the time to familiarize oneself with VSAN Observer, even when there are no anomalies occurring on the Virtual SAN cluster. Check what is a normal value for metrics like latency, IOPS, Outstanding IO, bandwidth, etc. It may even be worth gathering offline bundles from time to time to use as reference against possible future issues. As mentioned in the VSAN Observer section, any metrics that exceed boundary thresholds will be displayed with a red underline against the chart. This can then be used as a point to start investigating the root cause. Various reasons why some of these charts may be outside their respective thresholds have been discussed, but anything from an overloaded system to poor performing devices to physical switch issues impacting the network could be a root cause. Fortunately, VSAN Observer can assist with all of this. Next some VSAN Observer case studies are examined, where there are details on what to expect from VSAN Observer when some common scenarios are encountered. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 2 6 1
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