On 6/24/19 8:42 AM, Chris Olson via CentOS wrote:
We have a very old Dell desk top machine that has been running CentOS 6 for the past five years. It received a new, 1 TB disk ... Boot-up this morning lasted about six times as long as usual. Disk access, as indicated by the disk activity light, is almost continuous
Is it running software raid? Check the output of "cat /proc/mdstat" to see if it's re-syncing an array.