Disabling VAAI VMFS Heartbeats in VMware ESXi 5.5U2

We ran into something at work lately that caused some serious issues around PSODs and storage disconnects due to the way that VMware ESXi 5.5U2 changed the way VMFS heartbeats are used. Apparently VAAI now is used to manage the heartbeats in 5.5U2. If you need to disable this feature without turning off VAAI or reverting back to ESXi 5.5U1 you can used the advanced settings from esxcli below to accomplish this.  You can then run the list command to validate that the setting for Default Int Value: 1 is now set so that heartbeating is disabled for VMFS. This is an issue specifically for ESXi 5.5U2 connecting to IBM SVC on microcode and other versions but more importantly and issue around the change in VAAI controlling the heartbeating for VMFS datastores on IBM SVC storage.

Published by gr8n8tr0n


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: