Seagate X8 Accelerator Seagate X8 Accelerator User Guide for Linux - Page 20

10.3 vgc-config The vgc-config utility allows switching between Max Capacity and Max Performance modes and also allows splitting a device into two physical partitions of equal size. Making changes with vgc-config will erase NOTE existing data on the affected device or partition. By default X8 Accelerator devices are formatted in Max Capacity mode. If your application is write intensive, setting Max Performance mode instead of the default Max Capacity mode can be beneficial. Max Performance mode provides twice the sustained random write performance while reducing available user capacity of the device by 15%. Note that read performance and sequential write performance are same in Max Performance and Max Capacity modes. Only workloads that generate significant amount of random writes can benefit from using Max Performance mode. Splitting X8 Accelerator device into two separate physical partitions allows complete physical isolation of workloads and data on these partitions. The two physical partitions are presented as separate block devices, such as /dev/vgca0 and /dev/vgca1. However, in most cases Seagate recommends using the default configuration with one physical partition and using software partitions or LVM. Note that 550 GB and 1100GB models supports only one physical partition. # vgc-config --help vgc-config: 3.2.55402.C7 Utility to configure Seagate X8 Accelerator drives Usage: vgc-config -d|--drive [-l|--list] vgc-config -d|--drive -r|--reset [-f|--force] vgc-config -d|--drive -m |--mode [-f|--force] -n|--num-partitions vgc-config -p|--partition [-l|--list] vgc-config -p|--partition -r|--reset [-f|--force] vgc-config -p|--partition -m|--mode [-f|--force] vgc-config [-l|--list] vgc-config [-h|--help] Options: -d | --drive : drive name vgc[a,b,---] -f | --force : do not prompt for confirmation -h | --help : display this help and exit -l | --list : list current configuration -m | --mode : maxperformance/maxcapacity mode -n | --num-partitions : number of partitions, (1/2) -p | --partition : partition name vgc[a,b,---][0,1,---] -r | --reset : reset to factory defaults no arguments : list the current configuration of all drives/ partitions Example: Configure vgca device in two physical partitions in Max Performance mode: # vgc-config -d vgca -n 2 -m maxperformance SEAGATE X8 ACCELERATOR USER GUIDE FOR LINUX, REV. A 16