Date: 21 Apr 2008 01:02:33 +0200 From: "Arno J. Klaassen" <arno@heho.snv.jussieu.fr> To: stable@freebsd.org Cc: net@freebsd.org Subject: nfs-server silent data corruption Message-ID: <wpmyno2kqe.fsf@heho.snv.jussieu.fr>
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Hello, I've a strange problem with a box I'm setting up as nfs-server under 7-stable : - tyan S2895 MB, 2*285Dualcore Opteron, 4G-ECC, ahd-scsi, nfe-network - stripped GENERIC as kernel - sources as of last saturday afternoon (European time) I removed everything from /boot/loader.conf and /etc/sysctl.conf, still I get "easily" data corruption when exporting ahd-scsi over nfs (NB exporting geom_raid5 gives same data corruption) Testing with the following pseudo code : while checksum1 == checksum2 do create random file of $1 MBytes calculate md5 checksum1 copy calculate md5 checksum2 on copy Tested on both (as nfs-client) a 6-stable-i386 from a couple of weeks ago as well as a linux 2.6.15-gentoo-r1 of about two years ago : within half an hour the copy will be different .... ;( I played with nfs-options on client side (nfs[23], conn, intr, [udp|tcp], -r=, -w= ) but none seem to matter. Start/Stop rpc.lock/sttatd on server/client just provoked some : cp: utimes: BIG2: No such file or directory cp: chown: BIG2: Stale NFS file handle cp: chmod: BIG2: Stale NFS file handle cp: chflags: BIG2: Operation not supported cp: BIG2: Stale NFS file handle cp: setting permissions for `BIG2': Stale NFS file handle cp: closing `BIG2': Stale NFS file handle [and then the while loop continued ... as if the NFS handle where not that stale ..] Anyway, I'll try to nail this down more (e.g. nfs-write performance is horrible ... (nfsd falling down to 0% cpu and then after while 'wake up' and be at around 3-6% again)) I didn't stress-test this MB for a while, but last time I did was with 7-PRELEASE/RC?/CANTremember-exactly-but-close-to-release and all worked great I did add 2G ECC to the 2nd CPU since, though I doubt that interferes with NFS. Bref, if anyone has a suggestion ???? (I will try downgrade to RELENG_7_0 iff noone has a new suggestion for RELENG_7, but I'd like to go forward and test some maybe suspect recent MFC or other suggestion) Thanx in advance, best, Arnohelp
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