On Thu, Jul 1, 2010 at 04:33, Lutz Schumann <presa...@storageconcepts.de> wrote: > Hello list, > > I wanted to test deduplication a little and did a experiment. > > My question was: can I dedupe infinite or is ther a upper limit ? > > So for that I did a very basic test. > - I created a ramdisk-pool (1GB) > - enabled dedup and > - wrote zeros to it (in one single file) until an error is returned. I don't know about the rest of your test, but writing zeroes to a ZFS filesystem is probably not a very good test, because ZFS recognizes these blocks of zeroes and doesn't actually write anything. Unless maybe encryption is on, but maybe not even then.
I'd write a little program that initializes 128k of memory to a particular pattern, then writes it to disk until it gets ENOSPC (or some other error code, I suppose). That should force the first block to actually be written, and all the others to point to it. > During the experiment I could nicely see: > - that performance on ramdisk is CPU bound doing ~125 MB /sec per Core. Ouch! That's all? Will _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
