svn commit: r217828 - projects/graid/head/sys/geom/raid
Robert Watson
rwatson at FreeBSD.org
Wed Jan 26 10:20:21 UTC 2011
On Wed, 26 Jan 2011, Alexander Motin wrote:
> That's all true. Those who want maximum robustness should use dedicated
> drive on the most trivial dedicated controller to make dumping reliable. If
> we are going above that - there are always some compromises.
This seems to be the best conclusion in the NIC space certainly -- for network
debugging and crashdumps, a dedicated NIC involves far fewer compromises.
However, the traditional route of resetting $controller when you realise
you're past the point of no return, and then doing polled I/O to the freshly
initialised device, should be pretty reliable under most circumstances.
> What's about dumping to GEOM, I think that with r217827 change (in
> projects/graid/head) it should be possible to implement robust dumping to
> gmirror and gstripe without doing any allocations and GEOM interaction. With
> some efforts it could also be done to graid by writing specialized
> minimalistic dumping routines for every transformation module (at least it
> seems trivial for RAID0/RAID1).
Sounds good.
Robert
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