id	summary	reporter	owner	description	type	status	component	version	resolution	keywords	cc	guest	host
14008	AHCI Port Reset After 1500 Hours Without Any Warnings	tjiptomangun		"Dear VirtualBox community.
Our guest suddenly stop working properly after 1500 hours .
First we cannot ssh into it although it is still responsive to ping request.
After restart we found that guest files and /var/log/messages for the last 5 hours did not written to disk.
VBox.log shows that an AHCI port reset occured 5 hours beforehand.
By accident our system administrator restart the host instead of the guest, that is why there are no other information in VBox.log.1 after port reset.
Unlike bug #9975 this reset did not precede by any warnings nor errors.
We make a guess that this is an hard reset and from what we learn from AHCI specification, hard reset is triggered by software, which in this case is linux driver. 
What we don't know is why the driver reset the port. Is this because something in VD/VDI or AHCI emulation ?
Please help us.
Another information the host disk is configured as raid-5.
Both Host and Guest are linux kernel 3.0.7

Thank you very much.

regards,
tjiptomangun
"	defect	closed	virtual disk	VirtualBox 4.3.16	invalid	AHCI Port Reset		Linux	Linux