Disk firmware can kill a whole cluster how exactly? Cisco explains

guest · Jul 2, 2018

Disk firmware can kill a whole cluster how exactly? Cisco explains
UCS and HyperFlex owners at risk of outages thanks to faulty firmware
July 2, 2018
https://www.theregister.co.uk/2018/...ex_disk_firmware_problem_could_kill_clusters/

Cisco’s issued a Field Notice warning that its USC servers and hyperconverged HyperFlex kit could be brought low by disk drive firmware.
The Notice says “A drive firmware issue on select Self-Encrypting Drives”. The Register counts 16 different disk SKUs that could cause problems on UCS servers and one for HyperFlex.

The faulty firmware “might be triggered when the drive is subjected to a low-write, long-idle-time workload, which could result in uncorrectable drive-level errors.” On UCS servers the machines will show read errors.
On HyperFlex rigs, management software blacklist the drive a step Cisco explains “could be a transitional state while the cluster attempts to repair the disk.”

But while the cluster tries to fix the drive, it could be “permanently blacklisted, which could trigger frequent drive replacements.”

“While the HyperFlex HX Data Platform software protects against drive failures, there is a potential for the cluster to fail after multiple, simultaneous drive failures.”
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