Quoting John Baldwin <[EMAIL PROTECTED]> (from Wed, 17 Oct 2007 09:07:06 -0400):
On Tuesday 16 October 2007 06:14:34 pm Constantine A. Murenin wrote:
On 16/10/2007 17:01, John Baldwin wrote:
> Basically, by having so little data in hw.sensors if I had to write a RAID
> monitoring daemon I would just not use hw.sensors since it's
easier for me to
> figure out the simple status myself based on the other state I
already have
> to track (unless you write an event-driven daemon based on
messages posted by
> the firmware in which case again you wouldn't use hw.sensors for
that either).
There is no other daemon that you'd need, you'd simply use sensorsd for
this. You could write a script that would be executed by sensorsd if a
certain logical disc drive sensor changes state, and then this script
would call the bio framework and give you additional details on why the
state was changed.
That's actually not quite good enough as, for example, I want to keep yelling
about a busted volume on a periodic basis until its fixed. Also,
having a volume
change state doesn't tell me if a drive was pulled. On at least one RAID
controller firmware I am familiar with, the only way you can figure
this out is
to keep track of which drives are currently present with a
generation count and
use that to determine when a drive goes away. Even my monitoring daemon for
ata-raid has to do this since the ata(4) driver just detaches and
removes a drive
when it fails and you have no way to figure out which drive died as
the kernel
thinks that drive no longer exists.
Note, talking about interaction with bio or similar is not productive
ATM. On Sunday I had a discussion with scottl and he identified some
things with bio which don't make it a good choice for FreeBSD.
Unfortunately I didn't had time to take it off the ideas list so far.
Scott also agreed to come up with a description for a similar
framework that is is usable with our RAID drivers.
Bye,
Alexander.
--
http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
Mother is far too clever to understand anything she does not like.
-- Arnold Bennett
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