zfs discuss - Aug 2008 - zpool autoexpand property - HowTo question

I noted this PSARC thread with interest:
  Re: zpool autoexpand property [PSARC/2008/353 Self Review]
because it so happens that during a recent disk upgrade,
on a laptop. I''ve migrated a zpool off of one partition
onto a slightly larger one, and I''d like to somehow tell
zfs to grow the zpool to fill the new partition.  So,
what''s the best way to do this?  (and is it safe?:)

Thanks,
Gordon
 
 
This message posted from opensolaris.org

On Fri, Aug 22, 2008 at 10:54:00AM -0700, Gordon Ross
wrote:
> I noted this PSARC thread with interest:
>   Re: zpool autoexpand property [PSARC/2008/353 Self Review]
> because it so happens that during a recent disk upgrade,
> on a laptop. I''ve migrated a zpool off of one partition
> onto a slightly larger one, and I''d like to somehow tell
> zfs to grow the zpool to fill the new partition.
Depending on exactly how you did it, that should have already happened.
A pool will expand automatically (even in situations where you might not
want it to.)

Can you show details of your existing configuration that show that it
hasn''t expanded?

I believe (but am not certain) that the PSARC you refer to only has to
do with expanding LUNs.  Since you mentioned a "migration", I assume
you
didn''t expand the existing storage.  Is that correct?

-- 
Darren

> Depending on exactly how you did it, that should have already happened.
> A pool will expand automatically (even in situations where you might not
> want it to.)
> 
> Can you show details of your existing configuration that show that it
> hasn''t expanded?
# fdisk -W - /dev/rdsk/c0d0p0
* Dimensions:
*    512 bytes/sector
*     63 sectors/track
*    255 tracks/cylinder
*   12161 cylinders
*
* systid:  [...]

* Id    Act  Bhead  Bsect  Bcyl    Ehead  Esect  Ecyl    Rsect    Numsect
  12     0    0          1        1          254    63     1023    16065   
51102765
  131   0    254      63      1023    254    63     1023    51118830 23438835
  130   128  254    63      1023    254    63     1023    74557665 35343000
  207   0     254     63      1023    254    63     1023    109900665 85465800

# zpool list
NAME    SIZE   USED  AVAIL    CAP  HEALTH  ALTROOT
rpool  16.8G  12.0G  4.74G    71%  ONLINE  -
tank   40.5G  32.7G  7.79G    80%  ONLINE  -

That last one (tank) is now on c0d0p4, which is the
last row in the fdisk output.

 
> I believe (but am not certain) that the PSARC you refer to only has to
> do with expanding LUNs.  Since you mentioned a "migration", I
assume
> you didn''t expand the existing storage.  Is that correct?
The "migration" I did was to use "dd" to copy the whole
zpool off of the
old partition arrangement (while booted from an install CD, zpool not
imported at the time) and similarly copied it back after a repartiton that
gave this zpool some more space.

Now that you mention it, I think it must have filled the space, because
I think it was only around 32GB previously.  Now it looks like it''s
taking
40GB out of an available 40.75 GB.  Must have expanded, right?
(Cool!)
 
Silly me, doubting something might be not automatic in zfs!

Thanks,
Gordon
 
 
This message posted from opensolaris.org