Avago Technologies MegaRAID Fast Path Software - Manual (Page 275)

LSI Corporation Confidential | July 2011 Page 275
MegaRAID SAS Software User Guide Chapter 5: MegaRAID Command Tool | Performance Monitoring Options
5.22.7 Displays the Cache and Access
Policies
Use the command in the following table to display the cache and access policies of the
virtual disks.
5.23 Performance Monitoring
Options
The commands in this section are used to monitor the performance of the system.
5.23.1 Starting Performance Data
Collection
Use this command to start the collection of performance data for the time interval (in
minutes) specified by you. Once the specified time has elapsed, the performance data
collection stops.
Table 141: Displays the Cache and Access Policies of the Virtual Disks
Convention MegaCLI -LDGetProp -Cache |
-Access | -Name | -DskCache |
-PSPolicy -Lx|-L0,1,2|-LALL
-aN|-a0,1,2|-aALL
Description Displays the cache and access policies of the
virtual disks
The possible parameters follow:
Cache : Cached, Direct: Displays cache policy.
WT (Write through), WB (Write back): Selects
write policy.
NORA (No read ahead), RA (Read ahead), ADRA
(Adaptive read ahead): Selects read policy.
Access: -RW, -RO, Blocked : Displays
access policy.
DskCache : Displays physical disk cache policy.
PSPolicy : Displays the default and current
power savings policy of the virtual disk.
Table 142: Starting Performance Data Collection
Convention MegaCli -perfmon -start -interval <val> -aN
Description -perfmon: Specifies collection of performance data.
The possible parameters are:
-start: Starts the performance data collection.
-interval: the time interval (in minutes) that you specified for which you
want the performance data collection. The default value is 5 minutes.