I already reported this issue here:Disk drive LED lights all time after Solaris 11 upgrade to 11.1 (second)
but to summarise: I do have supermicro x9sra board and two drive connected to sata6/4 and sata6/5 ports, one ssd connected to sata6/1 port. The hardware runs fine with Solaris 11 11/11 and with Solaris 11.0. After upgrade to Solaris 11.1 I've noticed that hdd LED is turn forever.
Now, my new observation on this is that this does not happen just right after the boot to Solaris 11.1. In fact if I boot to single-user more, then the behaviour of hdd LED is normal, it just blinks on hdd access. So my conclusion is that some service started in multi-user mode is responsible for this behaviour and I would definitely like to find out which it is.
Is there any trick how to start services in step by step manner preferably also with printing to console service name and delay between services start? That would help a lot for debugging which service is responsible for this behaviour.
Please note that zpool iostat 1 shows normal drive activity, also vmstat 1 shows normal drive activity so there is no reason why the LED stays on forever...
Thanks for any hint how to debug this issue!