Date: Fri, 23 Jun 2006 12:22:07 +0300 From: Nikos Vassiliadis <nvass@teledomenet.gr> To: freebsd-questions@freebsd.org Cc: Jon Falconer <jfalconer@puc.edu> Subject: Re: problem creating filesystem snapshot Message-ID: <200606231222.07599.nvass@teledomenet.gr> In-Reply-To: <Pine.BSI.4.05L.10606221042020.19399-100000@ecf2.puc.edu> References: <Pine.BSI.4.05L.10606221042020.19399-100000@ecf2.puc.edu>
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On Thursday 22 June 2006 21:04, Jon Falconer wrote: > 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. No, there is no magic in .snap directories. You can create a snapshot anywhere you want. You can find all snapshots in a UFS with the snapinfo(8) utility. > Is there > some partition size restrictions? Can't answer this question, but there are a few commits after 6.1-RELEASE so you can try updating to 6.1-STABLE and see what's going on. Also, why don't you ask freebsd-fs@?
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