Solaris 10 & Above: Increase the performance of a UFS filesystem

Solution

1. Set the Write-Throttle High Watermark to 1/64 of total memory size
2. Set the Write-Throttle Low Watermark to 1/128 of total memory size
3. These Values must be set PERMANENTLY in /etc/system

 
For a system with 1 GB RAM,

• Add the following entries into /etc/system and reboot.
  
  
  set ufs:ufs_HW = 16777216
  set ufs:ufs_LW = 8388608