Hi Rich,
On Mar 4, 2009, at 9:30 AM, Richard Morris - Sun Microsystems -
Burlington United States wrote:
Quick Background:
The pNFS project (http://opensolaris.org/os/project/nfsv41/) 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.
Thanks and I agree about when to (and not to) display snapshots.
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 -
That is good feedback. Thanks.
It is not perfect, but you can do this, currently:
(pnfs-17-21:/home/lisagab):6 % zfs list -o
name,type,used,avail,refer,mountpoint
NAME TYPE USED AVAIL REFER
MOUNTPOINT
rpool filesystem 30.0G 37.0G 32.5K /rpool
rpool/ROOT filesystem 18.2G 37.0G 18K legacy
rpool/ROOT/snv_105 filesystem 18.2G 37.0G 6.86G /
rpool/ROOT/snv_105/var filesystem 11.4G 37.0G 11.4G /var
rpool/dump volume 9.77G 37.0G 9.77G -
rpool/export filesystem 40K 37.0G 21K /
export
rpool/export/home filesystem 19K 37.0G 19K /
export/home
rpool/pnfsds pnfs-dataset 31K 37.0G 15K -
rpool/pnfsds/47C80414080A4A42 pnfs-dataset 16K 37.0G 16K -
rpool/swap volume 1.97G 38.9G 4.40M -
Having the above be the default "zfs list" output is a simple change
to make, but I can't commit do doing it unless, of course, there is
buy in from the ZFS team. Does anyone have insight into any known
problems it may cause to add the "type" property to the default output
or why it was left out in the first place?
Thanks,
Lisa
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