Take a look at http://docs.sun.com/app/docs/doc/819-2396/6n4mi6etf?a=view it
looks like you can now specify a size for the metadb option in the profile.
under the older Solaris 9 and older this was a issue.
metadb Profile Keyword (Creating State Database Replicas)
metadb slice [size size-in-blocks] [count number-of-replicas]
The metadb keyword enables you to create Solaris Volume Manager state database
replicas (mediates) during your custom JumpStart installation. You can use the
metadb keyword multiple times in your profile file to create state database
replicas on different disk slices.
slice
You must specify the disk slice on which you want the custom JumpStart
program to place the state database replica. The slice value must follow the
format cwtxdysz.
size size-in-blocks
The size optional keyword enables you to specify the size, in blocks, of
the state database replica to be created. If you do not specify a size value,
the custom JumpStart program uses a default size of 8192 blocks for the state
database replica.
count number-of-replicas
You can specify the number of state database replicas you are creating by
setting the optional count keyword value in your profile. If you do not specify
a count value, the custom JumpStart program creates three state database
replicas by default.
For more information about creating Solaris Volume Manager state database
replicas during your installation, see State Database Replicas Guidelines and
Requirements in Solaris Express Installation Guide: Planning for Installation
and Upgrade.
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