ssd OSD and disk controller limitation

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I am trying to create a 5 node cluster using 1 Tb SSD disks with 2 OSD
on each server.Each server will have 10G NIC.
SSD disks are of good quality and as per label it can support ~300 MBps

What are the limiting factor that prevents from utilizing full speed
of SSD disks?

Disk  controllers are 3 Gbps,so if i am not wrong this is the maximum
i can achieve per host.Can ceph distribute write parallely and over
come this limit of 3Gbps controller and thus fully utilize the
capability of ssd disks.

I have a working 3 node ceph setup deployed using ceph-deploy using
latest firefly and 3.16 kernel but this is on low quality SATA disks
and i am planning to upgrade to ssd

can some one please help me in understanding this better.

Thanks
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