[Linux-cluster] GFS/GFS2 problems with iozone

[Michael O'Sullivan]

Hi everyone,

I am having some problems testing a GFS system using iozone. I am 
running CentOS 2.6.18-128.1.6.el5 and have a two node cluster with a GFS 
installed on a shared iSCSI target. The GFS sits on top of a 1.79TB 
clustered logical volume and can be mounted successfully on both cluster 
nodes.

When using iozone to test performance everything goes smoothly until I 
get to a file size of 2GB and a record length of 2048. Then iozone exits 
with the error

Error fwriting block 250, fd= 7

and (as far as I can tell) the GFS becomes corrupted

fatal: invalid metadata block
bh = 12912396 (magic)
function = gfs_get_meta_buffer
file = /builddir/build/BUILD/gfs-kmod-0.1.31/_kmod_build_/src/gfs/dio.c, 
line = 1225

Can anyone shed some light on what is happening?

Kind regards, Mike O'S