06-15-2005
I am not quite sure whether we are on the right track, without further metrix posted. Even a default ext3 config is not likely to be the bottleneck of this wait i/o issue. What about RAID strip unit size? What about NFS options (noac, cache, rsize, wsize, etc)? Especially noac. I am quoting related section from nfs man page:
----------------------------------------------------------------------
noac Disable all forms of attribute caching entirely. This
extracts a server performance penalty but it allows two
different NFS clients to get reasonable good results
when both clients are actively writing to common
filesystem on the server.
-------------------------------------------------------------------------
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LEARN ABOUT OPENDARWIN
nfsmount.conf
NFSMOUNT.CONF(5) File Formats Manual NFSMOUNT.CONF(5)
NAME
nfsmount.conf - Configuration file for NFS mounts
SYNOPSIS
Configuration file for NFS mounts that allows options to be set globally, per server or per mount point.
DESCRIPTION
The configuration file is made up of multiple sections followed by variables associated with that section. A section is defined by a
string enclosed by [ and ] branches. Variables are assignment statements that assign values to particular variables using the = operator,
as in Proto=Tcp. Sections are broken up into three basic categories: Global options, Server options and Mount Point options.
[ NFSMount_Global_Options ] - This statically named section defines all of the global mount options that can be applied to every NFS mount.
[ Server "Server_Name" ] - This section defines all the mount options that should be used on mounts to a particular NFS server. The
"Server_Name" strings needs to be surrounded by '"' and be an exact match of the server name used in the mount command.
[ MountPoint "Mount_Point" ] - This section defines all the mount options that should be used on a particular mount point. The
"Mount_Point" string needs to be surrounded by '"' and be an exact match of the mount point used in the mount command.
EXAMPLES
These are some example lines of how sections and variables are defined in the configuration file.
[ NFSMount_Global_Options ]
Proto=Tcp
The TCP protocol will be used on every NFS mount.
[ Server "nfsserver.foo.com" ]
rsize=32k
wsize=32k
A 33k (32768 bytes) block size will be used as the read and write size on all mounts to the 'nfsserver.foo.com' server.
[ MountPoint "/export/home" ]
Background=True
All mounts to the '/export/home' export will be performed in the background (i.e. done asynchronously).
FILES
/etc/nfsmount.conf
Default NFS mount configuration file
SEE ALSO
nfs(5), mount(8),
9 Mar 2008 NFSMOUNT.CONF(5)