I am using ZFS since a while now without problems. I am still excited about it, and I highly trust it. But from time to time, new questions come to my mind (in particular after having read some documentation, which sometimes increases the number of questions instead of reducing it).
In this case, I have added a new vdev (a mirror) to a root pool, and therefore have read the zpool manual (man zpool). At the end of the section zpool add, it states:
-o property=value
Sets the given pool properties. See the “Properties” section for a
list of valid properties that can be set. The only property supported
at the moment is ashift. Do note that some properties (among them
ashift) are not inherited from a previous vdev. They are vdev
specific, not pool specific.
That means that the ashift property is not pool specific, but vdev specific. But I have not been able to find any command or option which would allow me to view that property (or any other vdev specific property) per vdev.
In other words, for example, if I have a pool which contains one vdev with ashift=12 and one vdev with ashift=10, how can I verify this?
What I have already tried:
root@cerberus:~# zpool list -v -o ashift rpool
ASHIFT
12
mirror 928G 583G 345G - 27% 62%
ata-ST31000524NS_9WK21HDM - - - - - -
ata-ST31000524NS_9WK21L15 - - - - - -
mirror 928G 74.4M 928G - 0% 0%
ata-ST31000524NS_9WK21FXE - - - - - -
ata-ST31000524NS_9WK21KC1 - - - - - -
root@cerberus:~# zpool get all rpool
NAME PROPERTY VALUE SOURCE
rpool size 1.81T -
rpool capacity 31% -
rpool altroot - default
rpool health ONLINE -
rpool guid 3899811533678330272 default
rpool version - default
rpool bootfs rpool/stretch local
rpool delegation on default
rpool autoreplace off default
rpool cachefile - default
rpool failmode wait default
rpool listsnapshots off default
rpool autoexpand off default
rpool dedupditto 0 default
rpool dedupratio 1.00x -
rpool free 1.24T -
rpool allocated 583G -
rpool readonly off -
rpool ashift 12 local
rpool comment - default
rpool expandsize - -
rpool freeing 0 default
rpool fragmentation 13% -
rpool leaked 0 default
rpool feature@async_destroy enabled local
rpool feature@empty_bpobj active local
rpool feature@lz4_compress active local
rpool feature@spacemap_histogram active local
rpool feature@enabled_txg active local
rpool feature@hole_birth active local
rpool feature@extensible_dataset enabled local
rpool feature@embedded_data active local
rpool feature@bookmarks enabled local
rpool feature@filesystem_limits enabled local
rpool feature@large_blocks enabled local
So neither zpool list nor zpool get show any property in a vdev specific manner.
Any ideas?