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[Linux-cluster] GFS/GFS2 problems with iozone



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


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