Elliott
Dabbler
- Joined
- Sep 13, 2019
- Messages
- 40
I'm experimenting with building a FreeNAS and I'm not getting the speeds I expected. Could the problem be with the SAS backplane?
Chenbro RM41736 chassis has two backplanes, one with 24 drives and the other with 12 drives. Each backplane connects to an LSI 9300 with one 4-port SAS cable.
Disks: 36 disks, mix of WD Blue WD10EZEX and Toshiba DT01ACA1, all 1TB 7200 RPM
I have tested sequential write on each disk individually and they are all around 160 - 170 MBps. When I make a simple zpool stripe with 8 of these disks, it writes at 1250 MBps (great). As I add more disks, the speed tops out around 1700MBps. CPU does not seem to be maxed out on any thread. So I'm guessing it's a poor quality backplane, is there anything else I could check here?
Chenbro RM41736 chassis has two backplanes, one with 24 drives and the other with 12 drives. Each backplane connects to an LSI 9300 with one 4-port SAS cable.
Disks: 36 disks, mix of WD Blue WD10EZEX and Toshiba DT01ACA1, all 1TB 7200 RPM
I have tested sequential write on each disk individually and they are all around 160 - 170 MBps. When I make a simple zpool stripe with 8 of these disks, it writes at 1250 MBps (great). As I add more disks, the speed tops out around 1700MBps. CPU does not seem to be maxed out on any thread. So I'm guessing it's a poor quality backplane, is there anything else I could check here?