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Re: raidframe with R5/RS not reconstructing?
Would it be possible to get a pullup to NetBSD-5.x as well?
On Feb 20, 4:46pm, Greg Oster wrote:
} Subject: Re: raidframe with R5/RS not reconstructing?
} On Thu, 16 Feb 2012 15:09:40 -0600
} Greg Oster <oster%cs.usask.ca@localhost> wrote:
} > On Sun, 12 Feb 2012 06:50:52 -0600 (CST)
} > "John D. Baker" <jdbaker%mylinuxisp.com@localhost> wrote:
} > > An experimental oversight caused one unit of my raid to get marked
} > > as failed, even though nothing's wrong with the hardware. It's now
} > > running in degraded mode and all the data appear to be intact.
} > >
} > > No problem, I thought. 'raidctl -R /dev/wd8a raid0' should put it
} > > back to its old self.
} > >
} > > But it doesn't. It immediately reports 12% completion and sits
} > > there (almost 9 hours now) with no apparent progress and no ETA
} > > computed (00:00).
} > >
} > > I suppose this is the acid test for the little-used RAID 5 w/Rotated
} > > Sparing option. The last time I needed it (in NetBSD-4 days on
} > > sparc), it worked just fine.
} > >
} > For those playing along at home:
} > I am able to replicate the issue, and have an understanding of what
} > the problem is (basically, with rotated sparing every nth stripe of an
} > n-disk RAID5_RS set doesn't generate any writes during reconstruction,
} > and the logic in the code is expecting there to be writes for every
} > stripe).
} > Just a simple matter of finding the correct fix...
} > (the reason this worked back in NetBSD-4 days is that the
} > reconstruction map code has been reworked since then, and this bug
} > was introduced...)
} The following two changes fix this issue:
} cvs rdiff -u -r1.33 -r1.34 src/sys/dev/raidframe/rf_reconmap.c
} cvs rdiff -u -r1.117 -r1.118 src/sys/dev/raidframe/rf_reconstruct.c
} A request for a pullup to netbsd-6 will happen in the next little
} Greg Oster
>-- End of excerpt from Greg Oster
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