Block storage: Disk utilization stays at 100% while CPU steal > 10%

#1

Since a couple of days we try to get a GP1-S instance working using block storage. If there is no CPU steal (<1%) perfromance is very good and our app works fine. At some point of the day (usually after noon), CPU steal jumps to 10…30% (!!!) and disk utilizazion gets stuck at 100%. At this point data rate to block storage is at very low levels approx 10 MB/s while before it was up to 200 MB/s.

Here some screenshots from netdata:

Here you see how the disks are busy at 100% and performance is down:

Since nobody at scaleway seems to be able helping me on this I hope in this forum somebody can give me some ideas were to look :neutral_face: