Date: Fri, 23 Jul 2010 19:49:19 -0400 From: Dan Langille <dan@langille.org> To: freebsd-stable@freebsd.org Subject: Re: Using GTP and glabel for ZFS arrays Message-ID: <4C4A2A7F.7060807@langille.org> In-Reply-To: <4C48E695.6030602@langille.org> References: <4C47B57F.5020309@langille.org> <4C48E695.6030602@langille.org>
next in thread | previous in thread | raw e-mail | index | archive | help
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/
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4C4A2A7F.7060807>