On Fri, Feb 26, 2016 at 11:01:28PM -0500, Joseph Fernandes wrote: > Well correctly we dont migrate the existing signature, the file starts > it life fresh in the new tier(i.e get the bit rot version 1 on the new > tier), > Now this is also the case with any special xattr/attributes of the > file. > Again we rely heavily on the dht rebalance mechanism for migrations, > which also doesnt carry special attributes/xattr. Is there a good reason to not migrate the bitrot signature? Relying on an existing functionality is fine, but if it does not address all your needs, you have a valid use-case to improve it. Niels > > > ----- Original Message ----- > From: "Niels de Vos" <ndevos@xxxxxxxxxx> > To: "Joseph Fernandes" <josferna@xxxxxxxxxx> > Cc: "Gluster Devel" <gluster-devel@xxxxxxxxxxx> > Sent: Friday, February 26, 2016 10:33:11 PM > Subject: Re: Bitrot/Tering : Bad files get migrated and hence corruption goes undetected. > > On Fri, Feb 26, 2016 at 09:32:46AM -0500, Joseph Fernandes wrote: > > Hi All, > > > > This is a discussion mail on the following issue, > > > > 1. Object is corrupted before it could be signed: In this case, the corrupted > > object is signed and get migrated upon I/O. There's no way to identify corruption > > for this set of objects. > > > > 2. Object is signed (but not scrubbed) and corruption happens thereafter: > > In this case, as of now, integrity checking is not done on the fly > > and the object would get migrated (and signed again in the hot tier). > > > > > > The (1) is definitely not a issue with bitrot with tiering. But (2) we can do something to avoid > > corrupted file from getting migrated. Before we migrate files we can scrub it, but its just a naive > > thought, any better suggestions? > > Is there a reason the existing signature can not be migrated? Why does > it become invalid? > > Niels
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