Dell PowerVault, Manual

Page: 46 / 396

Setting The RAID Controller Module Clocks
To synchronize the clocks on the RAID controller modules with the host, use the
set storageArray
time
command. Running this command helps ensure that event timestamps written by RAID controller
modules to the Major Event Log (MEL) match event timestamps written to the host log files. The RAID
controller modules remain available during synchronization. An example of the command is:
client>smcli 123.45.67.89 -c "set storageArray time;"
Setting The Storage Array Host Type
The
set storageArray
command enables you to define the default host type. The following syntax is
the general form of the command:
set storageArray defaultHostType=(hostTypeName | hostTypeIdentifier)
The
defaultHostType
parameter defines how the RAID controller modules communicate with the
operating system on undefined hosts connected to the storage array. This parameter defines the host
type only for storage array data I/O activities; it does not define the host type for the management
station. The operating system can be Windows or Linux. For example, if you set the
defaultHostType
to Linux, the RAID controller module communicates with any undefined host if the undefined host is
running Linux. Typically, you need to change the host type only when you are setting up the storage
array. The only time you might need to use this parameter is if you need to change how the storage array
behaves relative to the hosts.
Before you can define the default host type, you need to determine what host types are connected to the
storage array. To return information about host types connected to the storage array, you can use the
show storageArray
command with the
defaultHostType
parameter or
hostTypeTable
parameter.
This command returns a list of the host types with which the RAID controller modules can communicate;
it does not return a list of the hosts. The following examples show how to use the
defaultHostType
parameter and the
hostTypeTable
parameter:
client>smcli 123.45.67.89 -c "show storageArray defaultHostType;"
client>smcli 123.45.67.89 -c "show storageArray hostTypeTable;"
The following example shows how to define a specific default host type:
client>smcli 123.45.67.89 -c "set storageArray defaultHostType=11;"
The value 11 is the host type index value from the host type table.
Setting Modification Priority
Modification priority defines how much processing time is allocated for virtual disk modification
operations. Time allocated for virtual disk modification operations affects system performance. Increases
in virtual disk modification priority can reduce read/write performance. Operations affected by
modification priority include:
• Copyback
• Reconstruction
• Initialization
• Changing segment size
• Defragmentation of a disk group
• Adding free capacity to a disk group
46