On Tue, Oct 18, 2011 at 3:27 PM, Peter Tribble <peter.trib...@gmail.com>wrote:
> On Tue, Oct 18, 2011 at 9:12 PM, Tim Cook <t...@cook.ms> wrote: > > > > > > On Tue, Oct 18, 2011 at 3:06 PM, Peter Tribble <peter.trib...@gmail.com> > > wrote: > >> > >> On Tue, Oct 18, 2011 at 8:52 PM, Tim Cook <t...@cook.ms> wrote: > >> > > >> > Every scrub I've ever done that has found an error required manual > >> > fixing. > >> > Every pool I've ever created has been raid-z or raid-z2, so the > silent > >> > healing, while a great story, has never actually happened in practice > in > >> > any > >> > environment I've used ZFS in. > >> > >> You have, of course, reported each such failure, because if that > >> was indeed the case then it's a clear and obvious bug? > >> > >> For what it's worth, I've had ZFS repair data corruption on > >> several occasions - both during normal operation and as a > >> result of a scrub, and I've never had to intervene manually. > >> > >> -- > >> -Peter Tribble > >> http://www.petertribble.co.uk/ - http://ptribble.blogspot.com/ > > > > > > Given that there are guides on how to manually fix the corruption, I > don't > > see any need to report it. It's considered acceptable and expected > behavior > > from everyone I've talked to at Sun... > > http://dlc.sun.com/osol/docs/content/ZFSADMIN/gbbwl.html > > If you have adequate redundancy, ZFS will - and does - > repair errors. The document you quote is for the case > where you don't actually have adequate redundancy: ZFS > will refuse to make up data for you, and report back where > the problem was. Exactly as designed. > > (And yes, I've come across systems without redundant > storage, or had multiple simultaneous failures. The original > statement was that if you have redundant copies of the data > or, in the case of raidz, enough information to reconstruct > it, then ZFS will repair it for you. Which has been exactly in > accord with my experience.) > > -- > -Peter Tribble > http://www.petertribble.co.uk/ - http://ptribble.blogspot.com/ > I had and have redundant storage, it has *NEVER* automatically fixed it. You're the first person I've heard that has had it automatically fix it. Per the page "or an unlikely series of events conspired to corrupt multiple copies of a piece of data." Their unlikely series of events, that goes unnamed, is not that unlikely in my experience. --Tim
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