gregsting

Hello,

I migrated from cassandra 3.11 to Cassandra 4.1 recently. I also moved from Red Hat 7 to Red Hat 9.

I have a one node only setup that I use for Glowroot. The thing is working great for a while but every 4 hours exaclty (9h, 13h...) we see a peak in io (cpu is up to 90% in wait) that last way to long and slow downs everything.

Any idea what this does come from? Do I need to look for somehting specific in debug mode?

My last option is to make a 3 node setup to try to fight this but I'd like to be sure that it will help.

My data is around 100GB, 8cpu 32GB ram machine

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Thanks for any help