Re: Soft RAID1 and SATA - Hardware failure test - I power off disk and system freezes
On Thu, 15 Dec 2005, Jan Stavel wrote:
> VIA Technologies, Inc. VIA VT6420 SATA RAID Controller (rev 80)
> Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
According to http://linux.yyz.us/sata/sata-status.html#via this supports
SATA hotplugging in hardware. Good.
Do keep in mind that according to
http://linux.yyz.us/sata/software-status.html:
"libata supports host controller hotplug ("yank the card").
All SATA devices are hotplug-capable.
libata does not support device hotplug ("yank the drive")... yet.
Update: Lukasz Kosewski has contributed an initial implementation of SATA
device hotplug."
So the Linux kernel driver does not support SATA hotplug well (read: at all)
yet. And while switching a drive off is not exactly hotplug, it might
explain the failure mode you observed: the code just isn't ready yet.
> But if I try to power off a disk (unplug the power cable) the system
> freezes. I cannot read /proc/mdstat. The only way to get the system
> running is to do restart.
This is a bad failure mode, I'd report it to the kernel bugzilla, or failing
that, to the Debian BTS asking the kernel maintainers to forward it
upstream.
> Do I do something wrong when trying hardware fauilure?
I don't think so, the hardware you have tried it with should survive it
without trouble.
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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