dairyengguy
Dabbler
- Joined
- Jul 17, 2015
- Messages
- 28
So I am currently experimenting with using FreeNAS as a backup device. As of right now I just have a USB drive that I am dumping them to, and I am trying to add another layer in between for dailies (then relegate the USB to weekly).
I have read a lot of the warnings about deduplication and RAM requirements, and I am aware of the risks associated. My pool is only 3.6 TB usable right now, and I have about 2.5 TB of backups that get partially overwritten daily. I turned on deduplication on my test box, and it provided very promising results:
If I am calculating this correctly, I am seeing a 1.5 GB deduplication table in RAM, and 9GB on disk. Is that correct?
My system has 24 GB of RAM for that 3.6 TB of storage. I am wondering what you all think about the possibility of running this with dedupe on all the time?
I have read a lot of the warnings about deduplication and RAM requirements, and I am aware of the risks associated. My pool is only 3.6 TB usable right now, and I have about 2.5 TB of backups that get partially overwritten daily. I turned on deduplication on my test box, and it provided very promising results:
Code:
dedup: DDT entries 6459091, size 1458 on disk, 235 in core bucket allocated referenced ______ ______________________________ ______________________________ refcnt blocks LSIZE PSIZE DSIZE blocks LSIZE PSIZE DSIZE ------ ------ ----- ----- ----- ------ ----- ----- ----- 1 1.36M 173G 127G 131G 1.36M 173G 127G 131G 2 1.29M 165G 116G 119G 3.72M 477G 332G 342G 4 3.43M 439G 344G 352G 13.9M 1.74T 1.36T 1.39T 8 77.1K 9.63G 6.90G 7.14G 684K 85.5G 61.1G 63.2G 16 4.33K 554M 321M 341M 83.9K 10.5G 6.10G 6.48G 32 778 97.2M 67.5M 69.9M 31.8K 3.97G 2.82G 2.91G 64 104 13M 4.78M 5.37M 10.2K 1.27G 482M 544M 128 46 5.75M 2.14M 2.43M 7.40K 947M 326M 373M 256 3 384K 3K 24.0K 938 117M 938K 7.32M 512 1 128K 1K 7.99K 852 106M 852K 6.65M 2K 2 256K 2K 16.0K 6.47K 829M 6.47M 51.7M 4K 1 128K 1K 7.99K 4.36K 558M 4.36M 34.8M 16K 1 128K 1K 7.99K 31.3K 3.91G 31.3M 250M Total 6.16M 788G 594G 609G 19.8M 2.48T 1.87T 1.92T
If I am calculating this correctly, I am seeing a 1.5 GB deduplication table in RAM, and 9GB on disk. Is that correct?
My system has 24 GB of RAM for that 3.6 TB of storage. I am wondering what you all think about the possibility of running this with dedupe on all the time?