Hi,
nearly same for me. Was on 6.1.7. Fresh new install 6.2.3 Update 3 with June 1.03.
6 HDs (BIOS Mod+C1), all AHCI configured.
But if it comes to write access to ata5, I get a strange error and the drives ata5 and ata6 stalles:
"ata5.00: exception Emask 0x0 SAct 0x2000000 SErr 0x0 action 0x0"
little time later also ata6
If I only use MiniSAS with 4 HDs and internal SATA, everything works great.
As soon as I use eSATA, the system becomes instable.
It was running several years with all 6 HDs on 6.1.7 - but something changed with 6.2.3 Update 6.
Are all discs running in you system in the meanime?