Return-Path: linux-nfs-owner@vger.kernel.org Received: from mailgw02.dd24.net ([193.46.215.43]:47136 "EHLO mailgw02.dd24.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754498Ab3J0V57 (ORCPT ); Sun, 27 Oct 2013 17:57:59 -0400 Message-ID: <1382911068.6932.20.camel@heisenberg.scientia.net> Subject: Re: XATTRs in NFS? From: Christoph Anton Mitterer To: linux-nfs@vger.kernel.org Cc: "J. Bruce Fields" Date: Sun, 27 Oct 2013 22:57:48 +0100 In-Reply-To: <20131027191512.GA31322@fieldses.org> References: <1382560643.6924.12.camel@heisenberg.scientia.net> <1382624000.6907.8.camel@heisenberg.scientia.net> <1382630468.6907.58.camel@heisenberg.scientia.net> <625CAA34-BD6C-4283-86D0-3F8B460D54D0@netapp.com> <1382635350.6907.83.camel@heisenberg.scientia.net> <20131025140846.GB20497@fieldses.org> <1382807547.29041.12.camel@heisenberg.scientia.net> <20131027191512.GA31322@fieldses.org> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-lBo5JKXT0O8N+q+PtCuE" Mime-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org List-ID: --=-lBo5JKXT0O8N+q+PtCuE Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2013-10-27 at 15:15 -0400, J. Bruce Fields wrote: > Was this problem actually caught using checksums stored in xattrs, or > did the problem predate your use of xattrs? Phew... don't remember actually... but I think I haven't used that already back then and noticed it by chance when I did some diffs. > > So the idea of my integrity data is, that I really manually say "now th= e > > data is in the state where I consider it to be consistent and I want to > > have checksums stored and attached to the files, for exactly that > > state", e.g. after I have read out some images from the SD card (perhap= s > > even twice with the cache cleared and the results diffed) and placed in > > my archive. > > Afterwards I can regularly verify the whole archive and if at some stag= e > > corruptions as the above would have happened, I can simply take the > > respective files from backups. > How long have you been using this for? Uhm... about 3-4 years now. > How many problems has it caught? I do not keep exact statistics... but I remember a few cases where I found damaged backups (optimal media) which I replaced as a consequence. > How often do you checksum or verify files, and how expensive is that? Not that often,... on my actual data disks,... about every 4 months... on my backup media (I use to keep older generations of backups as well) about once a year. I've never really looked at how expensive it is,... all you need to do is simply reading all data + have their hashes calculated. 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