Darren Dunham wrote:
Also, even if it could read the data from a subset of the disks, isn't
it a feature that every read is also verifying the parity for
correctness/silent corruption?
It doesn't -- we only read the data, not the parity. (See line 708 of
vdev_raidz.c.) The parity is checked only when scrubbing.
Ah, that's a major misconception on my part then. I'd thought I'd read
that unlike any other RAID implementation, ZFS checked and verified
parity on normal data access.
Except that of course we compute the checksum of for all
data read and compare that with the checksum stored in
the block pointer.... and then use the parity data to
reconstruct the block if the checksums don't match.
- Bart
--
Bart Smaalders Solaris Kernel Performance
[EMAIL PROTECTED] http://blogs.sun.com/barts
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