Caimans,
The ZFS file system offers useful features for storage pools that might be also 
configured in the OpenSolaris Automated Installer.

Hot spares - used when devices fail

Intent log - used to specify an alternate device for synchronous transactions, 
usually a high-performance device

Cache - provides an additional level of caching between main memory and disk - 
performance improvements in certain situations if 
low-latency media are specified

Is there any interest in providing these in the OpenSolaris Automated Installer?

More information can be found:
- on the man page for zpool(1m)
- Solaris ZFS Administration Guide at http://docs.sun.com/app/docs/doc/819-5461/

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