Just a note to pass on in case anyone runs into the same situation.

I have a DELL R510 that is running just fine, up until the day that I needed to 
import a pool from a USB hard drive. I plug in the disk, check it with rmformat 
and try to import the zpool.  And it sits there for practically forever, not 
responding. The machine still responds to network connections etc., it's just 
the import command that takes forever.

After poking around with truss zpool import, I discovered that there were some 
devices that were taking forever to check/enumerate and that they didn't 
correspond to any devices I recognized. Finally I tweaked to the following:

from cfgadm -lv
Mfg: Avocent  Product: USB Composite Device-0  NConfigs: 1  Config: 0  <no cfg 
str descr>

Which is the supplier of the DELL components for the iDRAC management tools.

It turns out that the Virtual Media options were set to "Attach" in the BIOS so 
on a zpool import it was trying to read from these devices and taking between 
3-10 minutes to timeout per slice/partition to check.

Setting the Virtual Media to "Detach" and the OS will no longer see these 
devices and zpool importing works just fine.

Cheers,

Erik
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