SAS2-E16 expander in SC847 - Bandwidth concerns

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FlashEngineer

Member
Jan 27, 2016
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Hey guys, I just bought a new but discounted SC847 E16-R1400UB!

So it has the E16 expander for the 24 bay front portion and similar expander for 12 bay but I'm not worried on the rear one.

So with a M1015 card in IT mode, the expander can take SFF8087 which is 4 lanes 6gbps, = 24gbps feeding to that expander = 1gbps per drive.

Is this enough? Granted, this is for home use and I don't even think I'll populate all 24 right now, but in the event that I do, is it enough each drive has 1gbps?

I'm using NAS4Free with ZFS mirrored, so each vdev is consist of 2 drives. This actually speeds up reading since it can read from both drives.
 
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ttabbal

Active Member
Mar 10, 2016
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It all depends on what you put in the drive bays. HDDs will be fine. SSDs that are any good will get constrained.

Do you see transfers faster than 100MB/s per drive right now? Can it sustain that with the normal workload?
 
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FlashEngineer

Member
Jan 27, 2016
96
3
8
ttabbal said:
It all depends on what you put in the drive bays. HDDs will be fine. SSDs that are any good will get constrained.

Do you see transfers faster than 100MB/s per drive right now? Can it sustain that with the normal workload?
Click to expand...
The only fastest transfer is about 100-110MB/sec that's transferring files from the NAS to a desktop that has SSD.

They are all only HDD, no way I would run a NAS with pure SSD. Anyhow, the network would be more bottleneck I think, it has only has 4x gigabit connections via LACP.
 
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