Cisco warns that power to UCS chassis could drop • The Register

Cisco has warned owners of its UCS servers that they may have a loose screw. In the UCS X9508 chassis that houses their servers, ie.

A field notice issued by the company advises: “The Power Entry Module (PEM) for a small number of UCS 9508 units may not be secured in the chassis and may be removed when the power cord is unplugged from the chassis.

“The captive screws designed to secure the PEM were not properly tightened and some chassis were shipped with the module loose.”

If you are the unlucky owner of one of these chassis, Cisco warns that the PEM “could slip out of the chassis when the power cord is removed.”


Cisco offered a workaround, and for once you don’t need to download and apply a patch. Instead, you will need a screwdriver. But not just any old screwdriver, as this job requires a T10 torx head screwdriver.

Cisco’s instructions, shown below, suggest that an electric screwdriver can do the job if you can “torque to 4.5-6 inlb”, and leaves hand tightening as another option.

Just screw it on. Click to enlarge

Do not attempt any of these until you power off the servers in the chassis, as well as the chassis itself. It is best to do this from the rack power distribution unit, as the PEM could fall out if you try to disconnect at that end.

Cisco’s field notice states that only “a small number” of chassis have a loose screw. Still, the issue is a bit embarrassing as the UCS X9508 is Cisco’s newest chassis and only launched a few months ago to host its X-series servers which can be used to deploy resources. storage, CPU and GPU. The chassis has eight forward-facing server slots that can hold what Cisco describes as “a pool of future I / O resources that may include GPU accelerators, disk storage, and non-volatile memory.”

Hopefully Cisco properly tightens the screws on these future devices. ®

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