Re: Hard disk activity will not die down

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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@xxxxxxxxx> 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].

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