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Homework and Emergencies Emergency UNIX and Linux Support Is this how LVM snapshots work? Post 302510819 by pludi on Tuesday 5th of April 2011 05:22:39 AM
Old 04-05-2011
No. New changes will be written to the master volume right away. However, if data is changed that existed before the snapshot was taken, the old data is copied to the snapshot area, and only then the new one is committed to disk (see Copy-on-write). The size you're setting for the snapshot is the maximum amount of data the snapshot area can hold, meaning the maximum amount of data that may change before the snapshop becomes stale.
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snapconv(1)							     Emulators							       snapconv(1)

NAME
snapconv - Sinclair ZX Spectrum snapshot converter SYNOPSIS
snapconv [ -c ] [ -n ] infile outfile DESCRIPTION
snapconv converts between ZX Spectrum snapshot files. OPTIONS
-c specifies that all data in the output snapshot should be compressed, even if that compression will result in a bigger file than if some data is left uncompressed. This helps compatibility with some buggy programs that can only read entirely compressed .z80 files. -n specifies that the output snapshot should be uncompressed. -f specifies that the A and F and A' and F' registers should be swapped. Version 0.5.0 and older of libspectrum(3) had a bug that resulted in these registers being swapped in SZX snapshots only. Version 0.5.1 and newer of libspectrum(3) automatically recognise these snapshots and correct the problem, but this flag is necessary to fix some snapshots created by development versions only of libspectrum(3) which had the bug fixed, but cannot be distinguished from snapshots containing the bug. infile specifies the snapshot to be converted. This file can be in any of the snapshot formats supported by libspectrum(3). outfile specifies the output snapshot. The format will be determined by the file extension and can be in any of the formats libspectrum(3) supports for output. BUGS
None known. SEE ALSO
fuse(1), fuse-utils(1), libspectrum(3), listbasic(1), snap2tzx(1) The comp.sys.sinclair Spectrum FAQ, at http://www.worldofspectrum.org/faq/index.html. AUTHOR
Philip Kendall (philip-fuse@shadowmagic.org.uk). Version 1.0.0 16th December, 2010 snapconv(1)
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