Clearing a Full vSAN Trace Ramdisk Across ESXi Hosts in Parallel

While reviewing an SOS support bundle from a VMware Cloud Foundation environment, I noticed every ESXi host in the management cluster was logging the same warning, over and over, right up to the moment the bundle was collected: [vob.visorfs.ramdisk.full] Cannot extend visorfs file /vsantraces/vsantracesLSOMVerbose--...zst because its ramdisk (vsantraceFailover) is full. These are -INFO level VOB events, not errors, and they do not touch your data or VMs. But when the same symptom appears on all hosts at once, fires continuously, and never clears on its own, it is worth understanding what is actually happening and fixing it cluster-wide rather than logging into each host by hand. This post walks through the diagnosis and a small Bash script that queries, fixes, and reclaims space on every host in parallel. ...

June 24, 2026 · Cosmin Trif