While configuring a new raid I ran iostat to see that it is idle. It was, and there was no io showing at all. I then mounted it on a new mount point which I have no process using. I started hearing knocks from the PC case, and touching the disks revealed that they all had activity 1-2 times a second, concurrently, leading to the louder than usual noise. Here is what "iostat 60" is now showing on a totally idle system (this is a very typical entry): avg-cpu: %user %nice %system %iowait %steal %idle 0.21 0.00 0.19 1.36 0.00 98.24 Device tps kB_read/s kB_wrtn/s kB_read kB_wrtn sda 0.73 0.93 4.07 56 244 sdb 5.87 8.53 20.78 512 1247 sdd 6.67 10.93 23.18 656 1391 sdf 8.50 40.27 52.52 2416 3151 sde 6.20 4.40 16.65 264 999 sdh 5.97 10.13 22.38 608 1343 sdg 7.77 38.00 50.25 2280 3015 sdc 5.87 8.53 20.78 512 1247 md127 1.80 0.00 40.27 0 2416 sda is the root fs (ext4). md127 (ext4) is a RAID6 of 7 disks sd[b-h]1. What is this io, and can it be stopped? I want to allow the disks to enter low power mode (not spin down) when idle. This is up-to-date recent install of f28 (this is a test system, so not customized). TIA -- Eyal at Home (fedora@xxxxxxxxxxxxxx) _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx