Long initialization of Ethercat on servo drive SV660N

Hi everyoneI have a long initialization of Ethercat on a machine with 7 inovance SV660N servo drivers. I tried different Servoperiods. Sometimes some servo drivers do not initialize - they remain in PreOP. What could be the reason? Maybe someone has encountered this?

LinuxCNC 2.8.4 + ethercat-master 1.6.3

Is it connected via a direct cable, or does it go through a router/switch/splitter of some sort?

What is the ethernet speed?

Post `ethtool <interface ID>`
`<interface ID>` can be found with `ip a`

Perhaps it is related to the EOE mode of the drive. Generally, it is recommended to adopt the drive in COE mode...

I have had long sync times, and there recently was a user that went from debian 10 and igh 1.5 to debian 12, igh 1.6.3 and latest linuxcnc that experienced long time sync times. I switched network adapter which helped a lot, but there was no solution for the other guy.
In the dmesg list, you can see that the client's time is converging, it's just that it's converging too slowly.
One thing you can try, that doesn't solve the root cause, is to restart linuxcnc after such a failed start.
The thinking being that the clients now have a much better starting time for the time sync.