Hi,
for Ceph we want to use bunch of DL380Gen10 server with i816a array controller. 2 Disks in RAID 1 and the remaining disks in HBA mode for Ceph. I know that there have been issues with mixed mode and that it's still not supported for VMware vSAN (IIRC). According to https://h20195.www2.hpe.com/V2/GetDocument.aspx?docname=A00017196ENW mixed mode is supported with Gen10 controllers. But it also states: "Improved efficiency with mixed mode for Smart Array Controllers". What impact/downside does this mixed mode have? Is it just performance, if yes how much?
Someone recommended me to just use a seperate RAID 0 for each disk, but this seems to have an impact on disk replacement and needs a reboot to confirm the data loss (I could not check this).