Verifying Performance; Selecting Max Performance Or Max Capacity Mode - Seagate ST1100FR0000 User Manual

7.0 V P
ERIFYING ERFORMANCE
Before setting up a file system on the Seagate X8 Accelerator device, it is useful to measure the raw performance of each
device to ensure proper setup. This makes it easier to isolate and resolve any potential problems.
From the same page where you download drivers and utilities, you can download a simple performance testing script
"test.sh" that uses the GPL licensed FIO utility. Copy the required files "test.sh" and "fio" to the current directory and run it as
shown below:
# test.sh /dev/vgc[a, b, c, ...]0
Please be aware that the test script will
N
OTE
destroy all existing data on the device.
7.1 S M
ELECTING AX
By default Seagate 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 of Max Capacity mode while reducing available user capacity of the device by 15%.
Read performance and sequential write performance are same in Max Performance and Max Capacity modes. Only
workloads that generate significant amount of random write I/O will benefit from using Max Performance mode.
Use the following command to check current configuration of all X8 Accelerator devices:
# vgc-config
vgc-config: 3.2(55402.C7)
Current Configuration:
vgca 2 partition(s)
vgca0 mode=maxperformance
vgca1 mode=maxperformance
Command for formatting vgca0 in Max Performance mode:
# vgc-config -d vgca -n 2 -m maxperformance
vgc-config: 3.2(55402.C7)
*** Formatting drive. Please wait... ***
Command for formatting vgca0 in Max Capacity mode:
# vgc-config -d vgca -n 2 -m maxcapacity
vgc-config: 3.2.55402.C7
*** Formatting drive. Please wait... ***
Changing the performance mode using
N
OTE
vgc-config will erase existing data.
S X8 A
EAGATE CCELERATOR
P M
ERFORMANCE OR AX
sector-size=512
sector-size=512
U G L , R
SER UIDE FOR INUX EV
C M
APACITY ODE
raid=enabled
raid=enabled
. A 10