Date: Thu, 22 Jun 2006 11:04:58 -0700 (PDT) From: Jon Falconer <jfalconer@puc.edu> To: questions@freebsd.org Subject: problem creating filesystem snapshot Message-ID: <Pine.BSI.4.05L.10606221042020.19399-100000@ecf2.puc.edu>
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Greetings, I needed to dump the partitions on a running FreeBSD 6.1R system so I could duplicate them on a test server. The server is a Dell 2850 with the PERC 4e/Di RAID controller with 5 x 73GB disk array. So I thought I would try using the snapshot feature. I used the mksnap_ffs to create a snapshot of a 20GB partition. The command completed in about 15 - 20 seconds. I was then able to run dump against the new snap file and all seemed ok. I then tried the same thing on a 225GB partition. The mksnap_ffs command took over 30 minutes to complete. But every access to that partition after that just hung. I wanted to see the size of the snap file so I typed ls -l /home/.snap (where I had told mksnap_ffs to put the snap file) and it hung. Same thing from several logins. I figured I would have to reset the box so I typed sync, and that hung. All the time, access to other partitions was just fine (/, /usr, /var). All partitions (except /) were created with soft update enables (default when installing.) The questions. Is there anything magic about the /xxx/.snap directory in each partition? When I created the snap file for the 20GB partition, I did not put it inside the /xxx/.snap directory, and it worked fine. Is there some partition size restrictions? Thank you for your thoughts, Jon
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