lonelyzinc
Dabbler
- Joined
- Aug 8, 2019
- Messages
- 35
This is my first storage build, and it's going to be a Supermicro system with a SAS3 backplane supporting 36 drives. I'm hoping to eventually use it in a production environment, and I have some questions about when the SAS HBA will bottleneck in performance testing.
My plan is to buy a bunch of used SAS2 1 TB drives to get a feel for the performance the ZFS system can produce.
Am I right to think that if each drive averages about 150 MB/s read/write speeds, and a SAS3 HBA provides 12 Gb/s (or 1500 MB/s) of bandwidth, that 12 disk drives (150 MB/s times 12 = 1800 MB/s) will be enough to fully test the I/O throughput?
My original thought was to get 24 drives, but wouldn't that be overkill? The numbers say that would be over 3600 MB/s of disk bandwidth, and through a SAS3 HBA it wouldn't ever all get used at once.
My plan is to buy a bunch of used SAS2 1 TB drives to get a feel for the performance the ZFS system can produce.
Am I right to think that if each drive averages about 150 MB/s read/write speeds, and a SAS3 HBA provides 12 Gb/s (or 1500 MB/s) of bandwidth, that 12 disk drives (150 MB/s times 12 = 1800 MB/s) will be enough to fully test the I/O throughput?
My original thought was to get 24 drives, but wouldn't that be overkill? The numbers say that would be over 3600 MB/s of disk bandwidth, and through a SAS3 HBA it wouldn't ever all get used at once.