[Drbd-dev] Re: drbd_panic() in drbd_receiver.c
philipp.reisner at linbit.com
Thu Jul 6 16:38:59 CEST 2006
Am Mittwoch, 5. Juli 2006 19:49 schrieb Graham, Simon:
> Thanks again for the review; I understand and agree with your comments on
> doing this in 8 versus 7 - anything I do on 7 will just be for prototyping
> (because as I said it's much easier for me to test with 7 right now).
> I will take the approach of continuing with as much as possible of the
> resync (although as I suspected, it's MUCH easier to simply abort the
> resync as soon as any error is reported).
> One question -- you said that DRBD disconnects from the disk on the first
> (local) error -- I think this is only true if you set on-io-error to
> "Detach" -- we actually run with the default value of PassOn in which case
> drbd_io_error does nothing; I think this is actually the best way to run
> since it keeps the disk accessible for those blocks that are OK and returns
> errors for those that are not.
Hmmm. The current semantic is:
on-io-error = passOn
If there is a local read error, DRBD will pass the IO error on to the
filesystem without retrying on the peer node.
Maybe we should have one more on-io-error hander. One that
retrtries on the peer node, if there is one, and if there is no peer
it returns the IO error, without detaching from the disk.
I added that thought to my ROADMAP file...
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