Date: Sat, 24 Jul 2010 09:01:13 -0400 From: Dan Langille <dan@langille.org> To: Pawel Tyll <ptyll@nitronet.pl> Cc: Adam Vande More <amvandemore@gmail.com>, freebsd-stable@freebsd.org Subject: Re: Using GTP and glabel for ZFS arrays Message-ID: <4C4AE419.2020503@langille.org> In-Reply-To: <136751861.20100724135630@nitronet.pl> References: <4C47B57F.5020309@langille.org> <4C48E695.6030602@langille.org> <718046944.20100723032259@nitronet.pl> <4C4A42D5.7080805@langille.org> <AANLkTi=fMR1pQj11qCqMWwCM9nsovsm_PVh7%2BJeWF0ED@mail.gmail.com> <AANLkTi=y%2BUJE9rgt-X3Wj6zHTCUfu67QnaDBzayb=a-5@mail.gmail.com> <136751861.20100724135630@nitronet.pl>
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On 7/24/2010 7:56 AM, Pawel Tyll wrote: >> Easiest way to create sparse eg 20 GB assuming test.img doesn't exist >> already You trim posts too much... there is no way to compare without opening another email. Adam wrote: > truncate -s 20g test.img > ls -sk test.img > 1 test.img > No no no. Easiest way to do what you want to do: > mdconfig -a -t malloc -s 3t -u 0 > mdconfig -a -t malloc -s 3t -u 1 In what way is that easier? Now I have /dev/md0 and /dev/md1 as opposed to two sparse files. > Just make sure to offline and delete mds ASAP, unless you have 6TB of > RAM waiting to be filled ;) - note that with RAIDZ2 you have no > redundancy with two fake disks gone, and if going with RAIDZ1 this > won't work at all. I can't figure out a safe way (data redundancy all > the way) of doing things with only 2 free disks and 3.5TB data - third > disk would make things easier, fourth would make them trivial; note > that temporary disks 3 and 4 don't have to be 2TB, 1.5TB will do. The lack of redundancy is noted and accepted. Thanks. :) -- Dan Langille - http://langille.org/
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