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Re: ZFS RAIDZ2 and wd uncorrectable data error - why does ZFS not notice the hardware error?
gdt%lexort.com@localhost (Greg Troxel) writes:
>Ah, interesting point. I find this confusing, because I thought an
>uncorrectable read error would, for disks I've dealt with, cause the
>sector to be marked as permanently failed and pending reallocation.
It is. Doesn't mean that further read attempts aren't honored.
>I also didn't realize that wd(4) would issue aother read when there is a
>failure, but maybe that's in zfs glue code.
ZFS also seems to do a retry by itself, so you have wait the wd retries twice.
On Solaris, ZFS can issue a request with the B_FAILFAST flag to instruct
the driver to not attempt retries on its own.
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