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I am considering purchasing an HP D2700 for use with SSDs (Samsung Pro 840's), for use in realtime playback of high resolution images. The D2700 has two I/O modules (which I assume are the actual SAS expanders). However, since the enclosure was designed as a SAS enclosure, the "B" module routes to the second port of the SAS drives.

My question is: can the enclosure be rewired such that the "A" expander goes to drives 1-12, and the "B" expander goes to drives 13-25? I don't need the SAS redundancy since I'll be using SATA SSDs. And as-is, from what I can tell, I'll be limiting myself to a single SAS cable's worth of data (4 x 6Gb/sec), which is insufficient for my needs (I need double that).

Is this possible? Are there SFF-8087 type cables that go from the expanders to the backplane? Or do the expanders/ I/O modules jack straight into the backplane?

ewwhite
  • 201,205
Antoine Durr
  • 29

1 Answers1

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No. What you're asking for is not possible with the HP D2600 and D2700 storage enclosures.

The two controllers (I/O modules) are intended for dual-ported SAS drives and to provide two paths to the disks.

You are oversubscribed when you use a shelf like this. The link is a 4-lane 6Gbps SAS connection (24Gbps)...

If you want more bandwidth, you need to couple SAS SSDs or disks to a RAID controller or SAS HBA solution that can leverage MPIO (or MPxIO).

What are your real throughput requirements? 6 Gigabytes/second seems unrealistic. Plus, a single PCIe 2.0 link is going to cap at 4 Gigabytes/second...

What types of servers/HBAs are involved?

Edit - you're doing this on a Mac. The only way to get the bandwidth you require is to go with PCIe-based SSD, possibly striping across devices. Call FusionIO.

ewwhite
  • 201,205