RAID status monitoring HPE Smart Array E208i-p SR Gen10

It shouldn't be this hard, but I can't figure out how to monitor the RAID status with the HPE Smart Array E208i-p SR Gen10, in a HP ProLiant DL360 Gen10 in Linux.

• I can't find a file in /proc or /sys.
• arcconf says: Controllers found: 0.
• ssacli controller all show says: Error: No controllers detected.
• Same for HP SSA CLI: Error: No controllers detected.

Edit: it was a bit confusing because this server has two RAID controllers, but neither work so far, so the question is the same.

This is the lspci -v output of the E208i-p:

  11:00.0 Serial Attached SCSI controller: Adaptec Smart Storage PQI 12G SAS/PCIe 3 (rev 01)
  Subsystem: Hewlett-Packard Company Smart Array E208i-p SR Gen10
  Physical Slot: 1
  Flags: bus master, fast devsel, latency 0, IRQ 26, NUMA node 0
  Memory at e2800000 (64-bit, non-prefetchable) [size=32K]
  I/O ports at 4000 [size=256]
  Capabilities: [80] Power Management version 3
  Capabilities: [b0] MSI-X: Enable+ Count=64 Masked-
  Capabilities: [c0] Express Endpoint, MSI 00
  Capabilities: [100] Advanced Error Reporting
  Capabilities: [300] #19
  Kernel driver in use: smartpqi
  Kernel modules: smartpqi

This of the P408i-a:

    b1:00.0 Serial Attached SCSI controller: Adaptec Smart Storage PQI 12G SAS/PCIe 3 (rev 01)
    Subsystem: Hewlett-Packard Company Smart Array P408i-a SR Gen10
    Flags: bus master, fast devsel, latency 0, IRQ 32, NUMA node 0
    Memory at f3800000 (64-bit, non-prefetchable) [size=32K]
    I/O ports at c000 [size=256]
    Capabilities: [80] Power Management version 3
    Capabilities: [b0] MSI-X: Enable+ Count=64 Masked-
    Capabilities: [c0] Express Endpoint, MSI 00
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [300] #19
    Kernel driver in use: smartpqi
    Kernel modules: smartpqi

Linux version:

cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.4 LTS"

Edit: on a slightly order server, with 'Hewlett-Packard Company Smart Array Gen9 Controllers (rev 01) / Hewlett-Packard Company P440', the hpssacli tool does work.