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VMware NFS bug strikes vSphere 5.5 Update 1 users

VMware vSphere 5.5 Update 1 users are having problems connecting to NFS storage.

The new VMware NFS bug causes random disconnects to storage, and it affects products from multiple vendors. The main symptoms of the problem are VMs that appear frozen and NFS datastores that are grayed out, according to blogger Michael Webster, an engineer at Nutanix.

The prevailing advice is to avoid migrating to vSphere 5.5 Update 1 — or roll back to the original vSphere 5.5 — until VMware issues a fix, which it has yet to do. The company has not yet warned customers about the problem, either.

“It is remarkable VMware customers have until now not been publicly informed by VMware about this issue,” wrote Marcel van den Berg, a virtualization consultant in the Netherlands. “Even though there is not a fix available yet, the issue seems bad enough to warn customers intending to upgrade.”

Nick Howell, an architect at NetApp (one of the affected storage vendors), first reported the VMware NFS bug yesterday.

“VMware has confirmed the issue in vSphere and is working closely with NetApp to determine [the] root cause,” he wrote.

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