Hi,

Ext4 is (slowly) initializing group blocks as far as I can remember. Patience should do the trick :)

HTH,

Le 3 février 2020 20:28:27 GMT+01:00, Chris Pemberton pchris.bci@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].

Is there something I've missed? _______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos

Be patient...

You are likely correct as the [ext4lazyinput] process is now gone. Probably finished up last night as the drives are quiet now.

For completeness:

What did "cat /proc/mdstat" say?

# cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdc1[1] sdb1[0] 3906885440 blocks super 1.2 [2/2] [UU] bitmap: 0/30 pages [0KB], 65536KB chunk

unused devices: <none>

Unfortunely, I can not be 100% certain if the [ext4lazyinput] process was still active when I captured the mdstat output shown above. But that is what it says now that the process is gone.

Thanks to everyone for their input.