You can use the vxcache command to increase the size of the cache volume that is associated with a cache object:
# vxcache [-g diskgroup] growcacheto cache_object size
For example, to increase the size of the cache volume associated with the cache object, mycache, to 2GB, you would use the following command:
# vxcache -g mydg growcacheto mycache 2g
To grow a cache by a specified amount, use the following form of the command shown here:
# vxcache [-g diskgroup] growcacheby cache_object size
For example, the following command increases the size of mycache by 1GB:
# vxcache -g mydg growcacheby mycache 1g
You can similarly use the shrinkcacheby and shrinkcacheto operations to reduce the size of a cache.
See the vxcache(1M) manual page.