10.1 geom "diskid"

Patrick M. Hausen hausen at punkt.de
Wed Nov 19 15:55:36 UTC 2014

Now it's getting decidedly weird:

> Am 19.11.2014 um 16:40 schrieb Patrick M. Hausen <hausen at punkt.de>:
> Hi, all,
> next question, sorry. I just created a fresh 10.1 installation
> with ZFS. With the last reboot after adding dedicated SSD
> based l2arc and zil, the underlying devices are referred to
> by "diskid" instead of the GPT labels I have first been using:
> 	NAME                                STATE     READ WRITE CKSUM
> 	zroot                               ONLINE       0     0     0
> 	  mirror-0                          ONLINE       0     0     0
> 	    gpt/disk0                       ONLINE       0     0     0
> 	    gpt/disk1                       ONLINE       0     0     0
> 	logs
> 	  diskid/DISK-BTTV334403R7200GGNp2  ONLINE       0     0     0
> 	cache
> 	  diskid/DISK-BTTV334403R7200GGNp1  ONLINE       0     0     0
> I can live with that, but I do not understand why the ada2 device
> changed from gpt/* to diskid/* while the others did not?
> /dev/gpt entries are not even present for ada2, neither are ada2p?
> At least the system could try to be consistent ;-)

gnop create -S 4096 /dev/diskid/DISK-BTTV334403R7200GGNp3
zpool create ssd /dev/diskid/DISK-BTTV334403R7200GGNp3.nop
zpool export ssd
gnop destroy /dev/diskid/DISK-BTTV334403R7200GGNp3.nop
zpool import ssd
zpool status

  pool: ssd
 state: ONLINE
  scan: none requested

	ssd         ONLINE       0     0     0
	  gpt/ssd   ONLINE       0     0     0

errors: No known data errors

WTF? Now it's referring to ada2p3 as gpt/ssd again. Of course the first 2
partitions are still diskid/DISK-BTTV334403R7200GGNp1 and p2, since
I have not changed anything about the "zroot" pool.

OK, reboot ...

zpool status
	NAME                                STATE     READ WRITE CKSUM
	ssd                                 ONLINE       0     0     0
	  diskid/DISK-BTTV334403R7200GGNp3  ONLINE       0     0     0

Now all 3 partitions on the SSD are addressed by diskid. The two mirror
vdevs by GPT label, and, needless to say, the two components of my swap
gmirror by legacy devices:

root at seleniumhub:~ # gmirror status
       Name    Status  Components
mirror/swap  COMPLETE  ada0p2 (ACTIVE)
                       ada1p2 (ACTIVE)

Although I created the mirror using /dev/gpt/swap0 and swap1, of course ;-)

Please do not consider this a major complaint. As long as everything works,
I'm perfectly happy. But I'd like to understand what is going on here.
All the recent Ubuntu installs I run refer to disks exclusively by UUID and here
we have three different kinds of devices in a single install. That *might*
scare away someone some time ...

Kind regards
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