Any "Best Practice" regarding use of zfs in LDOM with zones

I have 3 different networks and I want to create a guest-domain for each of the three networks on the same control domain.
Inside each guest-domain, I want to create 3 zones.
To make it easy to handle growth and also make the zones more portable, I want to create a zpool inside each guest domain and then a zfs for each zoneroot.
By doing this I will be able to handle growth by adding vdisks to the zpool(in the guest domain) and also to migrate individual zones by using zfs send/receive.
In the "LDoms Community Cookbook", I found a description on how to use zfs clone in the control domain to decrease deploy time of new guest domains:
" You can use ZFS to very efficiently, easily and quickly, take a copy of a previously prepared "golden" boot disk for one domain and redeploy multiple copies of that image as a pre-installed boot disk for other domains."
I can see clear advantages in using zfs in both the control domain and the guest domain, but what is the downside?
I ends up with a kind of nested zfs where I create a zpool inside a zpool, the first in the control domain and the second inside a guest domain.
How is zfs caching handled, will I end up with a solution with performance problems and a lot of I/O overhead?
Kindest,
Tor

I'm not familiar with the Sybase agent code and you are correct, only 15.0.3 seems to be supported. I think we'd need a little more debug information to determine if there was a workaround. May be switching on *.info messages in syslogd.conf might get some more useful hints (no guarantee).
Unfortunately, I can't comment on if, or when, Sybase 15.5.x might be supported.
Regards,
Tim
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