FreeBSD 9.2 zpool.cache

It shouldn't. But I think the last time I tried it it didn't work and I still had to copy the zpool.cache file. I haven't tried it with the last 9.2 release candidate/beta yet though.
 
It should work if you have only one ZFS pool in the system. The restriction was removed from 9-STABLE after the release of 9.1-RELEASE if I remember correctly.
 
I have set up ZFS on root with 9.2-BETA2.
Code: 
# zpool status
  pool: zroot
 state: ONLINE
  scan: none requested
config:

	NAME           STATE     READ WRITE CKSUM
	zroot          ONLINE       0     0     0
	  gpt/system0  ONLINE       0     0     0

errors: No known data errors

I notice zdb does not seem to work:

Code: 
# zdb
cannot open '/boot/zfs/zpool.cache': No such file or directory
# zdb zroot
zdb: can't open 'zroot': No such file or directory
 
Yes, I also noticed that with zdb on 9.2-BETA. To check the ashift value of my 4K aligned pool of GPT labelled disks I had to use: # zdb -C -e -p /dev/gpt [i]poolname[/i] | grep ashift
 
If a ZFS pool was created without a cachefile, zdb is of no use and shows errors as described on postings above.
If there is a need for a cachefile, it can be created like this:
Code: 
# zpool set cachefile=/boot/zfs/zpool.cache your_pool
 
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