> ----- Original Message -----
> From: Chris Pemberton [mailto:pchris.bci@xxxxxxxxx]
> To: centos@xxxxxxxxxx
> Sent: Mon, 3 Feb 2020 13:28:27 -0600
> Subject: Hard disk activity will not die down
>
> I updated my backup server this weekend from CentOS 7 to CentOS 8.
> OS disk is SSD, /dev/md0 are two 4TB WD mechanical drives.
> No hardware was changed.
>
> 1. wiped all drives
> 2. installed new copy of 8 on system SSD
> 3. re-created the 4TB mirror /dev/md0 with the same WD mechanical drives
> 4. created the largest single partition possible on /dev/md0 and formatted
> it ext4
> 5. waited several hours for the creation of /dev/md0 to finish
> 6. copied all data back onto /dev/md0
>
> Both installs were a full workstation, with Gnome.
> The mirror is mounted via fstab as:
> /dev/md0 /mnt/raid1 ext4 defaults 0 0
>
> Under CentOS 7 the /dev/md0 mirror was silent when not in use. Now under
> 8, the hard drives are constantly "pinged" by some process, at about the
> same frequency as a heartbeat monitor. I can not figure out what process
> is keeping them active. iotop does show a process named [ext4lazyinput].
>
> Is there something I've missed?
What does "cat /proc/mdstat" say?
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