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Power On Hours (POH) report as zero for a failed disk

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Applies to

ONTAP 9

Issue

When running "disk show" from the ONTAP clustershell with the "-fields power-on-hours" switch, a failed disk may report zero power-on-hours.
 
Example

cluster::> disk show -disk 6.10.4 -fields power-on-hours,serial-number,model,pool

disk   model            pool   power-on-hours serial-number
------ ---------------- ------ -------------- -------------
6.10.4 X377_STATE10TA07 FAILED 0              ABC12345

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