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Setting disk timeouts is an important factor for applications to survive both unexpected and expected node outages, such as failures or rebooting for updates. While the default SCSI timeout in most applications and operating systems is 30 seconds, storage vendors (including Dell Technologies) and application vendors typically recommend increasing these timeouts to 60 seconds or more to help ensure uptime. Two of the main locations to change the timeouts are at the ESXi host level and at the virtual-machine-guest-OS level. For details about setting timeouts for ESXi, see the Dell Technologies Host Connectivity Guide.
The timeout values set at the ESXi-host-driver level help ensure that the hosts and virtual machines can survive a storage node failover event. For details about setting timeouts for ESXi, see the Dell Technologies Host Connectivity Guide.
If VMware Tools are installed into a guest operating system, they automatically set the timeout values. However, if the guest operating system does not have VMware Tools installed, the administrator can set these values manually. While VMware documentation has examples for setting the disk timeouts in Microsoft Windows guest operating systems, consult the knowledge bases from operating system vendors to obtain specific guest settings.