Jumpstart/ZFS - mirror any any uses two slices on the same disk

Hi all,
I am setting up a set of custom Jumpstart profiles for a Solaris 10 10/09 SPARC install server. I am attempting to set up ZFS mirrored root filesystems using part of the two root disks (reserving the remainder for a second ZFS pool for application data). To achieve this, I have been using "mirror any any" as the device list for the pool directive in the Jumpstart profile
On my test system with 73GB disks I've had no problems, but testing against a new server with 146GB disks the installer seems to be putting both halves of the mirror onto the same disk - I presume because the root pool size is less than half the size of the disk, and so it can.
Is there any way to specify that the root pool should be mirrored across any two distinct disks, or any other advice on how to avoid this happening? I know I can specify exact slice names (i.e. "mirror c1t0d0s0 c1t1d0s0"), but some of the servers will have FC cards in, and so I can't guarantee what controller number the internal disks will be on.
As an example, here is a line from the rules file, and the associated profile (the start/finish scripts are currently only displaying information).
rules
====
arch sparc && memsize 4000-4200 begin_settings.sh sparc_4G_zfs lmu_setup.sh
sparc_4G_zfs profile
===============
install_type initial_install
system_type standalone
cluster SUNWCXall
pool rpool 30g 4097 1g mirror any any
Thanks,
Dave Taylor
Senior Infrastructure Consultant
Leeds Metropolitan University

Hello Dave,
I would expect that the profile you supplied will result in two slices off the same 146G disk to be selected for both sides of the mirror. If the numbers you had used for poolsize/swapsize/dumpsize had been smaller, you would would have had the same behavior on the 73G disk as well.
In short, when you say 'any', you are basically saying "I don't care where it goes, give me the first slice/device that works". So, with the 'any' in the first position, kernel probe order is used, so in this case the first disk is selected, and the zpool is created. With 'any' in the second position, again the first disk is found, with available space, the mirror slice is created.
If you want the two parts of the mirror to be on different devices, either alter the numbers for poolsize/swapsize/dumpsize in your profile so you cannot get both on the same disk, or don't use 'any' for the mirror vdev.
Again, if you use 'any', you are saying "I don't care". If you do care, don't use 'any'.
Channing

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    Attachments:
    twoport.zip ‏1184 KB

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