[Linux-cluster] GFS 6.1 kernel warning.

[Brad Dameron]

We have two rather large server's running GFS in a production
environment and have been getting errors since the start. First our
configuration.

2 - Quad 880 Opteron Servers with 64GB RAM
1 - Infortrend 2GB SAN
OS - SuSe 10.0 Professional (Kernel 2.6.13-15.8-smp x86_64)

Cluster network is on GigE connection. This link is shared and used for
other purposes but not much traffic.

Here is the error message:

Aug  7 14:40:45 CServer01 kernel: GFS: fsid=Cluster01:gfs1.1: warning:
assertion "gfs_glock_is_locked_by_me(ip->i_gl)" failed
Aug  7 14:40:45 CServer01 kernel: GFS: fsid=Cluster01:gfs1.1:   function
= gfs_readpage
Aug  7 14:40:45 CServer01 kernel: GFS: fsid=Cluster01:gfs1.1:   file
= /usr/src/gfs/src/cluster-1.02.00/gfs-kernel/src/gfs/ops_address.c,
line = 283
Aug  7 14:40:45 CServer01 kernel: GFS: fsid=Cluster01:gfs1.1:   time =
1154986845



This appears to occur when both machines try to access the same
files/directory. They happen at a rate of about 10-15 an hour. Anyone
know if this is critical or a way to turn these off if they are not an
issue? There is definitely a big performance issue when using GFS on
very CPU intense applications. When the first server is using all 8 CPU
core's doing processing the second server's IO response slows to a
crawl. Any sysctl tweaks to help improve the performance appreciated.

Thanks,
Brad Dameron
SeaTab Software
www.seatab.com