Date: Wed, 16 Feb 2011 19:39:41 +0100 From: "Ronald Klop" <ronald-freebsd8@klop.yi.org> To: freebsd-fs@freebsd.org Subject: Re: Snapshot on different sized partitions show different file types Message-ID: <op.vq0d4fqi8527sy@212-123-145-58.ip.telfort.nl> In-Reply-To: <AANLkTinzPR2b8UCYu6=UMYC3Secny80ZjS0Ve5FSgy7Z@mail.gmail.com> References: <AANLkTinzPR2b8UCYu6=UMYC3Secny80ZjS0Ve5FSgy7Z@mail.gmail.com>
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On Wed, 16 Feb 2011 10:33:23 +0100, Gareth Hopkins <gabbawp@gmail.com> wrote: > Hi, > > I'm creating snapshots on a couple of partitions ranging from 10GB to > 31GB > > running file on the snapshots show different filetypes for the snapshots > on > the larger than 10GB partitions. > > [root@ ~]# df -h / > Filesystem Size Used Avail Capacity Mounted on > /dev/da0s1a 9.7G 322M 8.6G 4% / > [root@ ~]# file /.snap/daily.0 > /.snap/daily.0: Unix Fast File system [v2] (little-endian) last mounted > on > /, last written at Wed Feb 16 00:34:01 2011, clean flag 1, readonly flag > 1, > number of blocks 5242880, number of data blocks 5077079, number of > cylinder > groups 56, block size 16384, fragment size 2048, average file size 16384, > average number of files in dir 64, pending blocks to free 0, pending > inodes > to free 0, system-wide uuid 0, minimum percentage of free blocks 8, TIME > optimization > > [root@ ~]# df -h /usr > Filesystem Size Used Avail Capacity Mounted on > /dev/da0s1d 31G 2.7G 26G 9% /usr > [root@ ~]# file /usr/.snap/daily.0 > /usr/.snap/daily.0: DOS executable (device driver) > > [root@ ~]# df -h /usr/local > Filesystem Size Used Avail Capacity Mounted on > /dev/da0s1e 15G 134M 14G 1% /usr/local > [root@ ~]# file /usr/local/.snap/daily.0 > /usr/local/.snap/daily.0: DOS executable (device driver) > > Is there some sort of limit on the snapshot size being reported to the > file > system ? > > Cheers, > > Gareth Hi, I am not authoritative in the ffs-snapshot stuff, but why would a snapshot always start with the same data? Maybe it is just sort of random. The 'file' utility just guesses the type by looking at the first N bytes of the file. I don't know if it has special knowledge about snapshot files. Ronald.
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