Veritas File System 4.1 Release Notes (5900-0592, March 2010)

cache size specified in the global (dynamic) tunable, vxfs_bc_bufhwm. If and when the
value of vxfs_bc_bufwhm is set to default (zero), VxFS automatically tuned the maximum
size of the metadata buffer cache based on the memory configuration on the system. On
systems with a RAM size of 1.5 GB or less, you can manually tune down the value of
vxfs_bc_bufhwm to a minimum of 6144 (6MB).
Tuning VxFS for Performance 17