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 (fed...@eyal.emu.id.au)
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