[CentOS] Hard disk activity will not die down

Mon Feb 3 22:07:08 UTC 2020
Robert Nichols <rnicholsNOSPAM at comcast.net>

On 2/3/20 3:13 PM, Laurent Wandrebeck wrote:
> Hi,
> Ext4 is (slowly) initializing group blocks as far as I can remember. Patience should do the trick :)

Indeed. See the manpage for mkfs.ext4 and scroll down to the "lazy_itable_init"
extended option, which is enabled by default.

Bob Nichols     "NOSPAM" is really part of my email address.
                 Do NOT delete it.

> Le 3 février 2020 20:28:27 GMT+01:00, Chris Pemberton <pchris.bci at gmail.com> a écrit :
>> 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].