>> I have some ugly code that forces all reads from a mirror set to
>> a specific copy, set via a global sysctl. This lets you do things
>> like make a backup from disk 0, then verify against disk 1 and take
>> action if something is wrong.
>
> That's interesting. Have you thought of making it read from _both_
> disks and check that the data matches, before passing it back?
It didn't seem to be worth doing, since a userspace program could
be written to do the same thing using my small patch. Only problem
is, it uses a global sysctl that affects every mirror set in the machine,
so it could affect performance of every mirror if used during load.
------
Chuck
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