Date: Sun, 6 Jul 2008 21:45:12 +0800 From: Astrodog <astrodog@gmail.com> To: "gnn@freebsd.org" <gnn@freebsd.org> Cc: current@freebsd.org Subject: Re: Has anyone else seen any form of in memory or on disk corruption? Message-ID: <2fd864e0807060645j65b67f97s5dc1e81145660c9d@mail.gmail.com> In-Reply-To: <m2r6a9poww.wl%gnn@neville-neil.com> References: <m2r6a9poww.wl%gnn@neville-neil.com>
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On 7/5/08, gnn@freebsd.org <gnn@freebsd.org> wrote: > Hi, > > I've been working on the following brain teasing (breaking?) problem > for about a week now. What I'm seeing is that on large memory > machines, those with more than 4G of RAM, the ungzipping/untarring of > files fails due to gzip thinking the file is corrupt. The way to > reproduce this is: > > 1) Create a bunch of gzip/tar balls in the 1-20MB range. > 2) Reboot FreeBSD 7.0 release > 3) Run gzip -t over all the files. > > I have hundreds of these files to run this over, and a full check > takes about 3 hours, but I usually see some form of corruption within > the first 20 minutes. > > Other important factors: > > 1) This is on very modern, 2P/4Core (8 cores total) hardware > 2) The disks are 1TB SATA set up in JBOD. > 3) The machines have 16G of RAM. > 4) Corruption is seen only after a reboot, if the machines continue to > run corruption is never seen again, until another reboot. > 5) The systems are all Xeon running amd64 > 6) The disk controller is an AMCC 9650, but we do see this very rarely > with the on board controlller. > 7) All boards are > > http://www.supermicro.com/products/motherboard/Xeon1333/5400/X7DWU.cfm > > 8) All machines have 3 1TB drives. > 9) The corruption is in 4K chunks. That is N x 4K. > 10) Files are not normally corrupted on disk, but this can happen. > > I have already tried a few of the obvious things, such as making sure > that we sync pages before we shutdown the twa driver. > > Given what I have seen I believe this is something that happens from > startup, and not at shutdown. > > Thoughts? > > Best, > George > As a datapoint for you, I use a number of the 9650s with 15 750GB or 1TB drives, on a Supermicro motherboard with Opteron processors and 4GB of memory. With this configuration I have not experienced any data corruption. --- Harrison
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