Quick Background:
The pNFS project (http://opensolaris.org/os/project/nfsv41/)
<http://opensolaris.org/os/project/nfsv41/%29> is adding a new DMU
object set type which is used on the pNFS data server to store pNFS
stripe DMU objects. A pNFS dataset gets created with the "zfs create"
command and gets displayed using "zfs list".
Specific Question:
Should the pNFS datasets show up in the default "zfs list" output?
Just as with ZFS file systems and ZVOLs, the number of pNFS datasets
that exist on a data server will vary depending on the configuration.
Lisa,
In Solaris 10, ZFS datasets of all types show up in the default output
of "zfs list". In Nevada, "zfs list" only shows by default datasets
that are filesystems or volumes. Snapshots of filesystems or snapshots
of volumes are not listed unless the pool level property called
"listsnapshots", which is "off" by default, is set to "on".
So the answer to the specific question above is, in Nevada, pNFS
datasets should show up in the default output from "zfs list" but that
snapshots of pNFS datasets should not unless "listsnapshots" is on.
However, with the addition of this new dataset type, it will be
difficult to distinguish a ZFS volume from a pNFS dataset. So perhaps
the default output of "zfs list" should also include the dataset type.
Maybe something like this:
NAME TYPE USED AVAIL REFER MOUNTPOINT
pool/fs FS 9.77G 37.0G 9.77G /pool/fs
pool/vol ZVOL 512M 37.0G 16K -
pool/pnfs pNFS 31K 37.0G 15K -
-- Rich
The following is output from the modified command and reflects the
current mode of operation (i.e. "zfs list" lists filesystems, volumes
and pnfs datasets by default):
(pnfs-17-21:/home/lisagab):6 % zfs list
NAME USED AVAIL REFER MOUNTPOINT
rpool 30.0G 37.0G 32.5K /rpool
rpool/ROOT 18.2G 37.0G 18K legacy
rpool/ROOT/snv_105 18.2G 37.0G 6.86G /
rpool/ROOT/snv_105/var 11.4G 37.0G 11.4G /var
rpool/dump 9.77G 37.0G 9.77G -
rpool/export 40K 37.0G 21K /export
rpool/export/home 19K 37.0G 19K /export/home
rpool/pnfsds 31K 37.0G 15K - <---pNFS
dataset
rpool/pnfsds/47C80414080A4A42 16K 37.0G 16K - <---pNFS
dataset
rpool/swap 1.97G 38.9G 4.40M -
(pnfs-17-21:/home/lisagab):7 % zfs list -t pnfsdata
NAME USED AVAIL REFER MOUNTPOINT
rpool/pnfsds 31K 37.0G 15K -
rpool/pnfsds/47C80414080A4A42 16K 37.0G 16K -
(pnfs-17-21:/home/lisagab):8 % zfs get all rpool/pnfsds
NAME PROPERTY VALUE SOURCE
rpool/pnfsds type pnfs-dataset -
rpool/pnfsds creation Mon Feb 2 13:56 2009 -
rpool/pnfsds used 31K -
rpool/pnfsds available 37.0G -
rpool/pnfsds referenced 15K -
rpool/pnfsds compressratio 1.00x -
rpool/pnfsds quota none default
rpool/pnfsds reservation none default
rpool/pnfsds recordsize 128K default
rpool/pnfsds checksum on default
rpool/pnfsds compression off default
rpool/pnfsds zoned off default
rpool/pnfsds copies 1 default
rpool/pnfsds refquota none default
rpool/pnfsds refreservation none default
rpool/pnfsds sharepnfs off default
rpool/pnfsds mds none default
Thanks,
Lisa
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