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Full Discussion: ZFS Filesystem
Operating Systems Solaris ZFS Filesystem Post 302953026 by jlliagre on Tuesday 25th of August 2015 02:40:18 AM
Old 08-25-2015
Quote:
Originally Posted by os2mac
while admittedly I don't know the specifics of how it works I do know that a zfs snapshot is a delta value of the FS.
This is incorrect, a snapshot is a frozen dataset content. What you call the delta value is written once on the live file system.
Quote:
so it must be recording those deltas somewhere.
The snapshots delta is already there, no need to record it.
Quote:
The older the snap the larger the file
Yes, if the file system is evolving.
Quote:
and the more snaps the more writes.
No, there is no write inflation.
Quote:
I can only tell you from practical experience that removing snapshots DOES improve performance.
Perhaps had you rolling snapshots in place?
 

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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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