Regarding the Operational Specifications for HA Mode

[n-tomo]

I am reviewing the operational specifications for HA mode. Could you please clarify the following points?

<Device Information>
Model: PA-3420 (2-unit HA configuration)
OS Version: 11.1.6-h10
Interface Information: Onboard (2 ports), Optical SFP10G (3 ports)
HA Ports: HA1-A,B
　　　　 HA2 Eth1/21,1/22 (Optical SFP10G)

Please confirm whether my understanding of the operational specifications for Shutdown mode and Auto mode in HA mode is correct.

- Behavior During Failover
Shutdown mode: All ports link up from scratch
Auto mode: Port states are preserved, resulting in faster failover

- Link-up Sequence
Shutdown mode: Ports link up sequentially, starting from port 1
Auto mode: Existing links are retained, so sequence has no effect

- SFP Diagnostics
Shutdown Mode: Always performed at startup → Causes delay
Auto Mode: Diagnostics unnecessary → High speed

- Definition of Switchover Time
Shutdown Mode: None (slower is by design)
Auto Mode: Switchover possible in short time

- Manufacturer Recommended Settings
Shutdown Mode: Recommended (prioritizes safety)
Auto Mode: Not recommended (can be selected for speed optimization)

Is it correct to understand that in Shutdown mode, link-up delays during switching are an OS specification, and the only way to speed it up is to change to Auto mode? However, in Auto mode, ports are always open, so depending on the configuration, there are concerns such as loops?