Date: Wed, 22 Jan 2014 14:01:40 -0800 From: Chris Stankevitz <chrisstankevitz@gmail.com> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-questions@freebsd.org Subject: Re: ZFS: pool vs FS Message-ID: <CAPi0pstg7X1Y43K_21usCPzn3nDvtaLiMcnV=AS2yNGUT5neMA@mail.gmail.com> In-Reply-To: <20140122204828.GA6033@dan.emsphone.com> References: <CAPi0psvd%2B%2BLdTf_STaAytnNSrwMWsj3dhM8Mho=Wb-XbAWojZw@mail.gmail.com> <20140122204828.GA6033@dan.emsphone.com>
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On Wed, Jan 22, 2014 at 12:48 PM, Dan Nelson <dnelson@allantgroup.com> wrote: > "zpool create" does create a filesystem Dan, Thank you. I suspected this was the case (the FreeBSD handbook certainly implies this). Now that we have that out of the way I can ask my real question: Can you identify the concept I am missing as evidenced by this failure: === # truncate -s 100m disk1 # truncate -s 100m disk2 # zpool create pool1 /root/disk1 # zpool create pool2 /root/disk2 So far so good... however, the next lines concern me. Some people seem to say "Wait, /pool1 is not a good filesystem to start using you need to uze 'zfs create' first". However your comment leads me to believe that /pool1 is okay to start using right away. # echo asdf > /pool1/file.txt # zfs snapshot pool1@123 Let's try to replicate: # zfs send pool1@123 | zfs recv pool2 cannot receive new filesystem stream: destination 'pool2' exists must specify -F to overwrite it Okay we have a problem. This is the heart of my misunderstanding. But I'll try to power through: # zfs send pool1@123 | zfs recv -F pool2 # zfs list -t snapshot NAME USED AVAIL REFER MOUNTPOINT pool1@123 18.5K - 31.5K - pool1@124 0 - 31.5K - pool2@123 0 - 31.5K - So far so good. And let's try another replication: # echo qwer > /pool1/file.txt # zfs snapshot pool1@124 # zfs send pool1@124 | zfs recv pool2 cannot receive new filesystem stream: destination 'pool2' exists must specify -F to overwrite it # zfs send pool1@124 | zfs recv -F pool2 cannot receive new filesystem stream: destination has snapshots (eg. pool2@123) must destroy them to overwrite it # echo Okay I do not understand what is happening. Thank you, Chris
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