Changing the Default Behavior of the metassist Command
You can use the volume defaults file (/etc/defaults/metassist.xml) to change the default
behavior for the metassist command. By changing the defaults file, you can explicitly
exclude from consideration, or include for consideration, specific disks or controllers. You can
also specify requirements for most volume settings used by the metassist command.
The format of the /etc/defaults/metassist.xml is specified by the /usr/share/lib/xml/dtd/volume-defaults.dtd Document Type Definition (DTD).
The format is documented in the volume-defaults(4) man page.
Changing the Volume Defaults File
Edit the volume defaults file (/etc/defaults/metassist.xml) to specify how the metassist command should
behave.
Note - When you edit the file, you must ensure that the file continues to
be compliant with the /usr/share/lib/xml/dtd/volume-defaults.dtd Document Type Definition (DTD). If the XML file
is not compliant with the DTD, the metassist command will fail with
an error message.
Example 23-11 Creating a Volume With Changed Defaults Using the
metassist Command
Before creating a volume, edit the /etc/default/metassist.xml file to specify the default settings
that you want to apply to all volumes you will create with the
metassist command. In this example, the metassist command only creates volumes on controller
c1 and, when creating stripes, only creates stripes with exactly four components and
an interlace of value 512KB. These constraints apply to all uses of the
metassist command until the /etc/default/metassist.xml file is changed again.
# cat /etc/default/metassist.xml
<!DOCTYPE volume-defaults SYSTEM \
"/usr/share/lib/xml/dtd/volume-defaults.dtd">
<volume-defaults>
<available name="c1" />
<stripe mincomp="4" maxcomp="4" interlace="512KB" ></stripe>
</volume-defaults>
# metassist create -s myset -S 10Gb
The metassist command creates a 10-Gbyte stripe, using exactly four slices and an
interlace value of 512 Kbytes, as specified in the /etc/default/metassist.xml file.
