I have a machine running Kubuntu 20.04, on an HP Z420, with 4 hard drives (in a software RAID configuration). Was working fine with 5.4.0 kernels, but after upgrade to 5.8.0-43-generic, it would fail to boot, only seeing 2 HDDs out of 4 - the ones that it no longer sees are attached to Intel Corporation C602 chipset 4-Port SATA Storage Control Unit (8086:1d6b, isci kernel module). When I boot back into 5.4.0-65-generic, then things are back to normal (after a 2-hour RAID re-sync and fsck :( ). Here is how things look with 5.4.0 (not brave enough to try booting into 5.8 again just yet):
SoftRaid 5.8.0
I used fio 3.25 on Ubuntu 20.10 with Ubuntu-provided Linux kernel 5.8.0-29-generic for these tests. I briefly tested the (currently) latest Linux kernel 5.11-rc4 too, it has some io_uring enhancements, but got lower throughput out of it. There are some big AMD ThreadRipper (power-aware scheduler) updates in it, apparently with some unsolved performance regressions.
6PL/Container version 1.2 can utilize the resource group capabilities that were introduced in Greenplum Database 5.8.0. If you downgrade to a Greenplum Database system that uses PL/Container 1.1 or earlier, you must use plcontainer runtime-edit to remove any resource_group_id settings from the PL/Container runtime configuration file. See Upgrading from PL/Container 1.1. 2ff7e9595c
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