Hi team, here's a new guide.
1 Viewing the Linux Host Latency
To check the I/O latency on a Linux host, perform the following steps:
1. Use the performance statistics function of the service software to view the delay, for example, the AWR report of the Oracle database.
2. Check the latency in the Linux performance test tool vdbench.
resp time: average time (in milliseconds) for processing each I/O request. Theoretically, the latency should be the same as the latency observed by iostat.
3. Use the Linux disk I/O check tool iostat to check the latency.
await: average time (unit: ms) for processing each I/O request, which can be considered as the I/O response time. If a Linux operating system does not have the iostat command, you can obtain the sysstat RPM package from the installation directory and install it.
2 Viewing the Windows Host Latency
1. Use the performance statistics function of the service software to check the delay.
2. In the Windows common performance test tool Iometer, check the latency. On the RUN Display page, check Average I/O Response Time(ms).
3. Use the performance monitor tool provided by the Windows operating system to check the host performance latency. For details, see the attachment.
3 Viewing the AIX Host Latency
You can run the iostat command to check the latency on the AIX host.
4 Viewing VMware ESXi Host Latency
To view the I/O latency on a VMware ESXi host, perform the following steps:
1. Enter the esxtop command and press Enter.
In this case, the CPU performance statistics (CPU mode, corresponding to the letter C) are displayed.
2. Enter U to switch to storage (LUN) performance statistics.
3. Enter F. The following screen is displayed. Items marked with an asterisk indicate monitored items. Enter J and K to view the storage latency, and press Enter.
4. Enter D to switch to the performance statistics of the storage adapter (HBA card).
5. Enter F. On the displayed screen, enter H and I to monitor the latency of the HBA.
6. Enter V to switch to VM performance statistics.
7. Enter F. On the displayed page, select G and H to monitor the VM latency.
