[illumos-Developer] Device type of my rpool is 'devfs' instead of 'zfs'

[Andrew Gabriel]

I'm really not sure quite what you're after.

fstyp(1M) will tell you what sort of filesystem is on a block device...

andrew at opensolaris:~# zpool status
  pool: rpool
 state: ONLINE
status: The pool is formatted using an older on-disk format.  The pool can
    still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'.  Once this is done, the
    pool will no longer be accessible on older software versions.
 scan: none requested
config:

    NAME        STATE     READ WRITE CKSUM
    rpool       ONLINE       0     0     0
      c7d0s0    ONLINE       0     0     0

errors: No known data errors
andrew at opensolaris:~# fstyp /dev/dsk/c7d0s0
zfs
andrew at opensolaris:~#


It looks like fstyp might have only fairly recently started recognising 
zfs filesystems. I tried it on an snv_125 system first, and it didn't 
recognise zfs (even though the system has the backend files 
/usr/lib/fs/zfs/fstyp*).

In your stat case, you are getting the filesystem type of the filesystem 
containing the /dev/dsk/c1d0s0 device node link, which is the devfs 
virtual filesystem which presents all the the /dev device tree.

Harshit Jain wrote:
> which command I should use to get the actual device type for a 
> particular disk partition?
>
>
>     On Tue, Jul 5, 2011 at 9:44 PM, Harshit Jain
>     <hjain.itbhu at gmail.com <mailto:hjain.itbhu at gmail.com>> wrote:
>
>         Hi,
>
>         I have openindiana installed on vmware. 'format' command
>         displays '/dev/dsk/c1d0s0 is part of active ZFS pool rpool'.
>         However, when I use stat("/dev/dsk/c1d0s0", &st) st.st_dev
>         returns ID of device 145752064 which matches to 'devfs'
>         fs-type. I want to know why I am getting fs-type as 'devfs'
>         instead of 'zfs' ?
>
>

-- 
Andrew