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+ Mon, 24 Jul 2017 10:19:43 -0700 (PDT)
+Date: Mon, 24 Jul 2017 13:19:42 -0400
+From: Ben Boeckel <mathstuf@gmail.com>
+To: "Laurence Perkins (OE)" <lperkins@openeye.net>
+Message-ID: <20170724171942.GA17269@megas.kitware.com>
+References: <1500484994.13826.5.camel@openeye.net>
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+Cc: "obnam-support@obnam.org" <obnam-support@obnam.org>,
+ "liw@liw.fi" <liw@liw.fi>
+Subject: Re: Variable Chunksize
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+
+On Mon, Jul 24, 2017 at 17:12:15 +0000, Laurence Perkins (OE) wrote:
+> Which just made me realise what kind of space savings I could get on
+> one of my archives...  I guess this just moved up the priority list a
+> ways...  Any suggestions for a hash that's fast enough to crawl over
+> large files without hurting performance too much while still giving
+> reasonable control over the average chunk size?
+
+What about the hashing used by casync in its chunking? From its
+announcement[1]:
+
+    The "chunking" algorithm is based on a the buzhash rolling hash
+    function. SHA256 is used as strong hash function to generate digests
+    of the chunks. xz is used to compress the individual chunks.
+
+It sounds like you use a rolling hash to find the chunks and then store
+them according to their SHA256 hash.
+
+--Ben
+
+[1]http://0pointer.net/blog/casync-a-tool-for-distributing-file-system-images.html
+
+_______________________________________________
+obnam-support mailing list
+obnam-support@obnam.org
+http://listmaster.pepperfish.net/cgi-bin/mailman/listinfo/obnam-support-obnam.org
diff --git a/tickets/11c32688f6ae4c039e5fef65b5007a88/Maildir/new/1500916892.M181237P17587Q2.koom b/tickets/11c32688f6ae4c039e5fef65b5007a88/Maildir/new/1500916892.M181237P17587Q2.koom
new file mode 100644
index 0000000..7d602d8
--- /dev/null
+++ b/tickets/11c32688f6ae4c039e5fef65b5007a88/Maildir/new/1500916892.M181237P17587Q2.koom
@@ -0,0 +1,140 @@
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+Date: Mon, 24 Jul 2017 20:20:43 +0300
+From: Lars Wirzenius <liw@liw.fi>
+To: "Laurence Perkins (OE)" <lperkins@openeye.net>
+Message-ID: <20170724172043.s2ykrfwcusyzdcgd@liw.fi>
+References: <1500484994.13826.5.camel@openeye.net>
+ <20170719181232.sdqihqdqldsgzmtd@liw.fi>
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+Subject: Re: Variable Chunksize
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+
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+
+On Mon, Jul 24, 2017 at 05:12:15PM +0000, Laurence Perkins (OE) wrote:
+> Smaller chunk size makes deduplication more precise regardless of the
+> type of splitting, but it should generate some pretty big savings on
+> similar data without reducing the chunk size because it will be better
+> at finding identical chunks of data since it's not relying on them
+> being at fixed offsets.
+
+If you have actual measurements of this, please report them. Some
+years ago when this idea first came up in the Obnam context, using
+the proposed type of chunking without reducing chunk size
+significatnly didn't much help in de-duplication. Only when the
+average chunk size became much smaller, did de-deuplication get a lot
+better, but then the number of chunks became a problem.
+
+Guessing isn't helpful here. Even if it were, now is not a good time
+for me to spend any time on this, and I don't want to even consider a
+patch for this until green albatross is in shape.
+
+--=20
+I want to build worthwhile things that might last. --joeyh
+
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+_______________________________________________
+obnam-support mailing list
+obnam-support@obnam.org
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