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].