I'm trying to figure out which devices are which in UCD-DISKIO-MIB; it seems 
opensolaris has 3 different names for things:

* zpool likes the nice simple /dev/dsk names, e.g. c3t6d0

* there's the horrendous actual name those are symlinks to: 
/dev/devices/p...@0,0/pci8086,2...@1c/pci1033,1...@0/pci1043,8...@6/s...@6,0:wd

* there's the name net-snmp reports: sd6

At least I think sd6 is what c3t6d0 is, from the "s...@6" in the long name.  
But there are three cmdk devices also:

lrwxrwxrwx 1 root root 51 2009-03-06 12:42 /dev/dsk/c5d0s0 -> 
../../devices/p...@0,0/pci-...@1f,2/i...@0/c...@0,0:a
lrwxrwxrwx 1 root root 52 2010-09-23 00:59 c5d1 -> 
../../devices/p...@0,0/pci-...@1f,2/i...@0/c...@1,0:wd
lrwxrwxrwx 1 root root 52 2010-09-23 00:59 c6d0 -> 
../../devices/p...@0,0/pci-...@1f,2/i...@1/c...@0,0:wd
lrwxrwxrwx 1 root root 52 2009-03-17 16:23 c6d1 -> 
../../devices/p...@0,0/pci-...@1f,2/i...@1/c...@1,0:wd

(though there is no c6d1 in the system)

UCD-DISKIO-MIB::diskIODevice.1 = STRING: cmdk0
UCD-DISKIO-MIB::diskIODevice.2 = STRING: sd6
UCD-DISKIO-MIB::diskIODevice.3 = STRING: sd2
UCD-DISKIO-MIB::diskIODevice.4 = STRING: sd3
UCD-DISKIO-MIB::diskIODevice.5 = STRING: sd7
UCD-DISKIO-MIB::diskIODevice.6 = STRING: sd4
UCD-DISKIO-MIB::diskIODevice.7 = STRING: sd8
UCD-DISKIO-MIB::diskIODevice.8 = STRING: sd1
UCD-DISKIO-MIB::diskIODevice.9 = STRING: sd5
UCD-DISKIO-MIB::diskIODevice.10 = STRING: cmdk1
UCD-DISKIO-MIB::diskIODevice.11 = STRING: cmdk3

I'm guessing cmdk0 is c5d0, as that's the "rpool" system disk and it would make 
sense for it to be first, and c5d1 and c6d0 were just added (mirrored pair of 
ssds for the zil), so they're at the end.  But I can't figure out how to make 
sure I know which drive is which when monitoring activity...
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