Cascading Array Enclosures - HP P2000 G3 MSA Technical White Paper

Technical white paper | HP P2000 G3 MSA

Cascading Array Enclosures

Since the P2000 G3 MSA can be upgraded from any MSA2000 G1/G2 model, the existing MSA70s and MSA2000 expansion
array enclosures might hold data that you need. The MSA70 and MSA2000 expansion enclosures operate at 3 Gb, see the
Figures 7 and 8.
Figure 7. Mixed 3 Gb and 6 Gb JBODs behind a P2000 G3 FC MSA array
Figure 8. Mixed 3 Gb and 6 Gb JBODs behind a P2000 G3 FC MSA array
Note
The 6 Gb MSA D2700 must come before the new 6 Gb MSA2000 2U 12 Expansion Enclosure in the cascade chain.
If MSA2000 2U 12 Expansion Enclosures are used in conjunction with D2700's, the MSA2000 2U 12 Expansion Enclosures
MUST come at the end of the cascade chain, and ONLY straight through cabling is allowed. Otherwise, either straight
through cabling or reverse cabling is allowed. Note that access to 6 Gb enclosures following a 3 Gb enclosure is restricted to
3 Gb; therefore, if reverse cabling is used, to avoid the drop, place the 3 Gb enclosure in the middle of the cascade chain, and
arrange Virtual Disks such that they do not span 6 Gb enclosures at the beginning and end of the cascade chain, and are
owned by the controller closest to them in the cascade chain.
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