On 06.08.2011 12:27, Ed Schouten wrote:
* Ed Schouten<e...@80386.nl>, 20110805 20:53:
The day before yesterday I upgraded a server of mine at Hetzner to
FreeBSD 9. It seems to use an MSI X58 Pro-E motherboard, having an ICH10
SATA-controller.
It seems that under high load, I get timeouts on the SATA controller. It
seems disabling MSI has no effect. Unfortunately it's a sort-of
production system, so I can't do a lot of testing with it and I also
don't have any hands-on console access.
False alarm. One of the hard disks of the server died, not long after I
upgraded to 9. They replaced the disk and the system runs fine again.
It should be noted that the ahci(4) driver made the system hang on
timeouts, whereas the ata(4) driver already observed timeouts during
startup and disabled the channel entirely. This allowed me to properly
boot with a single disk.
ata(4) always had more strict command timeout settings. That could allow
to recover faster, but caused problems in some cases. About a week ago
I've committed few patches to improve error recovery in case when device
completely stops responding. On my tests hung device dropped within 2-3
minutes. If device is not completely dead, repeating recovery may take
more time, but obviously this case has no right solution. If you have
some disk redundancy, you may try to reduce number of command retries to
make system recover faster.
--
Alexander Motin
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