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Full Discussion: EXT3 Performance tuning
Special Forums Hardware Filesystems, Disks and Memory EXT3 Performance tuning Post 75023 by tom_xx_hu@yahoo on Tuesday 14th of June 2005 11:27:50 PM
Old 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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dfmounts_nfs(1M)					  System Administration Commands					  dfmounts_nfs(1M)

NAME
dfmounts_nfs - display mounted NFS resource information SYNOPSIS
dfmounts [-F nfs] [-h] [server]... DESCRIPTION
dfmounts shows the local resources shared through NFS, along with the list of clients that have mounted the resource. The -F flag may be omitted if NFS is the only file system type listed in the file /etc/dfs/fstypes. dfmounts without options, displays all remote resources mounted on the local system, regardless of file system type. The output of dfmounts consists of an optional header line (suppressed with the -h flag) followed by a list of lines containing whitespace- separated fields. For each resource, the fields are: resource server pathname clients ... where resource Does not apply to NFS. Printed as a hyphen (-). server Specifies the system from which the resource was mounted. pathname Specifies the pathname that must be given to the share(1M) command. clients Is a comma-separated list of systems that have mounted the resource. OPTIONS
-F nfs Specifies the nfs-FSType. -h Suppress header line in output. server Displays information about the resources mounted from each server, where server can be any system on the network. If no server is specified, the server is assumed to be the local system. FILES
/etc/dfs/fstypes ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWnfscu | +-----------------------------+-----------------------------+ SEE ALSO
mount(1M), share(1M), unshare(1M), attributes(5) SunOS 5.11 6 Nov 2000 dfmounts_nfs(1M)
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