Hi, I De-Duped the second disk on the backup Server today.
Before De-Dup Filesystem Size Used Avail Capacity Mounted on Backup2 454G 335G 119G 74% /Backup2 After De-Dup Filesystem Size Used Avail Capacity Mounted on Backup2 454G 247G 207G 54% /Backup2 So 20% or 88 GB reclaimed without deleting anything :-) No. of PFSes - 3 Slaves and 3 Masters De-dup Simulate ==================================================================== dfly-bkpsrv# hammer dedup-simulate /Backup2 Dedup-simulate /Backup2: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 0 Dedup-simulate /Backup2 succeeded Simulated dedup ratio = 1.26 dfly-bkpsrv# hammer dedup-simulate /Backup2/pfs/Data Dedup-simulate /Backup2/pfs/Data: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 1 Dedup-simulate /Backup2/pfs/Data succeeded Simulated dedup ratio = 1.37 You have new mail. dfly-bkpsrv# hammer dedup-simulate /Backup2/pfs/VersionControl Dedup-simulate /Backup2/pfs/VersionControl: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 2 Dedup-simulate /Backup2/pfs/VersionControl succeeded Simulated dedup ratio = 2.79 dfly-bkpsrv# hammer dedup-simulate /Backup2/pfs/test Dedup-simulate /Backup2/pfs/test: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 3 Dedup-simulate /Backup2/pfs/test succeeded Simulated dedup ratio = 0.00 dfly-bkpsrv# hammer dedup-simulate /Backup2/www-daily-bak/www-hot Dedup-simulate /Backup2/www-daily-bak/www-hot: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 5 Dedup-simulate /Backup2/www-daily-bak/www-hot succeeded Simulated dedup ratio = 1.64 dfly-bkpsrv# hammer dedup-simulate /Backup2/mysql-daily-bak/mysql-hot Dedup-simulate /Backup2/mysql-daily-bak/mysql-hot: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 6 Dedup-simulate /Backup2/mysql-daily-bak/mysql-hot succeeded Simulated dedup ratio = 5.99 ==================================================================== Real De-dup ========================================================= dfly-bkpsrv# hammer dedup /Backup2 Dedup /Backup2: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 0 Dedup /Backup2 succeeded Dedup ratio = 1.25 580 MB referenced 462 MB allocated 2274 KB skipped 0 CRC collisions 0 SHA collisions 0 bigblock underflows dfly-bkpsrv# hammer dedup /Backup2/Data Dedup /Backup2/Data: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 1 Dedup /Backup2/Data succeeded Dedup ratio = 1.37 266 GB referenced 194 GB allocated 31 MB skipped 1960 CRC collisions 0 SHA collisions 20 bigblock underflows You have new mail. dfly-bkpsrv# hammer dedup /Backup2/VersionControl Dedup /Backup2/VersionControl: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 2 Dedup /Backup2/VersionControl succeeded Dedup ratio = 2.75 160 MB referenced 58 MB allocated 861 KB skipped 0 CRC collisions 0 SHA collisions 0 bigblock underflows You have new mail. dfly-bkpsrv# hammer dedup /Backup2/test Dedup /Backup2/test: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 3 Dedup /Backup2/test succeeded Dedup ratio = 0.00 0 B referenced 0 B allocated 0 B skipped 0 CRC collisions 0 SHA collisions 0 bigblock underflows dfly-bkpsrv# hammer dedup /Backup2/www-daily-bak/www-hot Dedup /Backup2/www-daily-bak/www-hot: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 5 Dedup /Backup2/www-daily-bak/www-hot succeeded Dedup ratio = 1.64 5599 MB referenced 3420 MB allocated 12 MB skipped 4 CRC collisions 0 SHA collisions 0 bigblock underflows dfly-bkpsrv# hammer dedup /Backup2/mysql-daily-bak/mysql-hot Dedup /Backup2/mysql-daily-bak/mysql-hot: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 6 Dedup /Backup2/mysql-daily-bak/mysql-hot succeeded Dedup ratio = 6.28 49 GB referenced 8079 MB allocated 0 B skipped 0 CRC collisions 0 SHA collisions 0 bigblock underflows You have new mail. ============================================================