Re: Are linux-fs's drive-fault-tolerant by concept?

[Chuck Ebbert]

>>   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