On 7/22/2010 8:47 PM, Dan Langille wrote:
Thank you to all the helpful discussion. It's been very helpful and
educational. Based on the advice and suggestions, I'm going to adjust my
original plan as follows.
NOTE: glabel will not be used.
First, create a new GUID Partition Table partition scheme on the HDD:
gpart create -s GPT ad0
Let's see how much space we have. This output will be used to determine
SOMEVALUE in the next command.
gpart show
Create a new partition within that scheme:
gpart add -b 1024 -s SOMEVALUE -t freebsd-zfs -l disk00 ad0
The -b 1024 ensures alignment on a 4KB boundary.
SOMEVALUE will be set so approximately 200MB is left empty at the end of
the HDD. That's part more than necessary to accommodate the different
actualy size of 2TB HDD.
Repeat the above with ad1 to get disk01. Repeat for all other HDD...
Then create your zpool:
zpool create bigtank gpt/disk00 gpt/disk02 ... etc
This plan will be applied to an existing 5 HDD ZFS pool. I have two new
empty HDD which will be added to this new array (giving me 7 x 2TB HDD).
The array is raidz1 and I'm wondering if I want to go to raidz2. That
would be about 10TB and I'm only using up 3.1TB at present. That
represents about 4 months of backups.
I do not think I can adjust the existing zpool on the fly. I think I
need to copy everything elsewhere (i.e the 2 empty drives). Then start
the new zpool from scratch.
The risk: when the data is on the 2 spare HDD, there is no redundancy. I
wonder if my friend Jerry has a spare 2TB HDD I could borrow for the
evening.
The work is in progress. Updates are at
http://beta.freebsddiary.org/zfs-with-gpart.php which will be updated
frequently as the work continues.
--
Dan Langille - http://langille.org/
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