zfs discuss - Jun 2007 - zfs receive

Hi, 
 
As part of a disk subsystem upgrade I am thinking of using ZFS but there are two
issues at present
 
1) The current filesystems are mounted as? /hostname/mountpoint except for one
directory where the mount point is <storage dir>/<storage application
dir>.
?? Is is possible to mount a ZFS filesystem as /hostname/<storage
dir>/<storage application> so that /hostname/<storage dir>
contains only directory <storage application>. Storage dir is empty apart
from the <storage application> directory which contains all the file?
 
2) Is there any possibility of having a "zfs ireceive " for an
interactive receive similar to the ufsrestore -i command? After twenty one years
of working with Sun kit, my experience is that I either have to restore a
complete filesystem (three disks failing in a RAID5 set) or I have to restore an
individual file or directory.
?? I have been told that "zfs receive" is very quick at restoring a
filesystem unfortunately it does not permit an interactive restore of selected
files and directories. Which is why I would like to see "zfs ireceive"
if possible which work on a zfs send created data stream but allow for
interactive or specified files or directories to be restored. Is does not matter
if it is 10x slower than restoring a complete filesystem, it is the ability to
selectively restore directories and files.
 
TIA 
 
Russell

Russell Aspinwall wrote:
> Hi, 
>  
> As part of a disk subsystem upgrade I am thinking of using ZFS but there
are two issues at present
>  
> 1) The current filesystems are mounted as  /hostname/mountpoint
> except for one directory where the mount point is <storage
> dir>/<storage application dir>. Is is possible to mount a ZFS
> filesystem as /hostname/<storage dir>/<storage application> so
that
> /hostname/<storage dir> contains only directory <storage
> application>. Storage dir is empty apart from the <storage
> application> directory which contains all the file?
I hope I understand you correctly - if so, I see no reason why this 
shouldn''t work:

# zfs list
NAME               USED  AVAIL  REFER  MOUNTPOINT
bigpool           4.11G  92.4G    21K  /extra
bigpool/home       819M  92.4G   819M  /export/home
bigpool/store     1.94G  92.4G  1.94G  /extra/store
# ls -als /extra/
total 13
    3 drwxr-xr-x   4 root     sys            4 May 15 21:44 .
    4 drwxr-xr-x  55 root     root        1536 Jun 22 03:31 ..
    3 drwxr-xr-x   2 root     root           2 May 15 21:44 home
    3 drwxr-xr-x   5 root     sys            8 May 15 21:54 store
# zfs set mountpoint=/extra/some/more/dirs/store bigpool/store
# zfs list
NAME               USED  AVAIL  REFER  MOUNTPOINT
bigpool           4.11G  92.4G    25K  /extra
bigpool/home       819M  92.4G   819M  /export/home
bigpool/store     1.94G  92.4G  1.94G  /extra/some/more/dirs/store
bigpool/zones     1.37G  92.4G    20K  /zones
bigpool/zones/lx  1.37G  92.4G  1.37G  /zones/lx
# ls -als /extra/some/
total 9
    3 drwxr-xr-x   3 root     root           3 Jun 23 10:19 .
    3 drwxr-xr-x   5 root     sys            5 Jun 23 10:19 ..
    3 drwxr-xr-x   3 root     root           3 Jun 23 10:19 more
# ls -als /extra/some/more/
total 9
    3 drwxr-xr-x   3 root     root           3 Jun 23 10:19 .
    3 drwxr-xr-x   3 root     root           3 Jun 23 10:19 ..
    3 drwxr-xr-x   3 root     root           3 Jun 23 10:19 dirs
# ls -als /extra/some/more/dirs/
total 9
    3 drwxr-xr-x   3 root     root           3 Jun 23 10:19 .
    3 drwxr-xr-x   3 root     root           3 Jun 23 10:19 ..
    3 drwxr-xr-x   5 root     sys            8 May 15 21:54 store
#

HTH
michael
-- 
Michael Schuster	Sun Microsystems, Inc.
recursion, n: see ''recursion''