As far as I know, ZFS prevents data from bit rot using methods like creating checksums and copy on write mechanisms.
I 'm not sure whether they use CRC or any other methods for creating checksums. On 10 March 2012 16:52, Siju George <[email protected]> wrote: > On Fri, Mar 9, 2012 at 5:12 PM, Basil Kurian <[email protected]> > wrote: > > I moved my KVM instances' HDD images to an ZFS filesystem running over > fuse > > on Fedora 16. The images in the folder are cloned from tmpl-centos57.img > > file. Later they are modified on runtime. So there is only small delta > > (change) between the files. In a normal filesystem like ext3 of ext4, the > > images will consume full disk space. That is 38.5GB. But in my zfs volume > > with deduplication enabled, It is occupying only 5.27GB space. Saved > almost > > 33GB space :) > > > > Note that 'ls' , 'du' like commands are not zfs aware , they may report > > wrong sizes. > > > > Yup dedup takes place in a lower layer. > We now store daily Linux LV snapshots from VMServers on DragonFly and > Hammer since dedup helps us do the the same thing. Are you able to get > Data of CRC collissions ? I am just curious :-) > > --Siju > > _______________________________________________ > Indian Libre User Group Cochin Mailing List > http://www.ilug-cochin.org/mailing-list/ > http://mail.ilug-cochin.org/mailman/listinfo/mailinglist_ilug-cochin.org > #[email protected] > -- Regards Basil
_______________________________________________ Indian Libre User Group Cochin Mailing List http://www.ilug-cochin.org/mailing-list/ http://mail.ilug-cochin.org/mailman/listinfo/mailinglist_ilug-cochin.org #[email protected]
