I noticed the same behaviour the last weeks. I have two nodes in the cluster, but so far I only saw it on one of them, the only difference is, that one has a ZFS Pool with the Volumes in it, so this looks like my assumption. But Op doesn't seem to use ZFS...
EDIT: Another difference is NVMe and...
I ran into the same problems. After the upgrade from 6.4 to 7 last weekend I experienced multiple hang ups during high IO.
The disabling of io_uring with "aio=native" solved the issue for me for now.
Kernel (with 6.4 and 7): 5.11
CPU: Intel i5-6500T (no intel-microcode pkg installed)
RAM: 16GB...
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