If your system is using a Veritas file system you may need to adjust
two important variables.


vxfs:vxfs_ninode - VxFS inode structures held in memory
vxfs:vx_bc_bughwm - the Buffer CacheÕs Buffer High Water Mark

If your system uses Veritas Volume Manager (VxVM) then you should look at vxio:vol_maxio. This variable controls the maximum size of I/O requests that are sent down the SCSI chain without breaking the request up. Recommendations are that this tunable parameter not exceed 20% of kernel memory or physical memory (which ever is smaller). This should match the size of your widest stripe.

On the info-ims mailing list this topic was discussed. I encourage you to check out the thread that starts with http://lists.balius.com/pipermail/info-ims-archive/2003-August/002006.html or if that is not working then look for the subject “VERITAS File System and Message Server”.