[CentOS] Disk Performance Issue

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.