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Expansion Plan
Work out a proper expansion plan before installing devices. Complying with the expansion principles improves installation efficiency.
Expansion Plan
Before connecting disk enclosures to a controller enclosure, carefully read the following rules:
- Connect the expansion module on controller A to expansion module A on a disk enclosure and the expansion module on controller B to expansion module B on a disk enclosure.
- All EXP expansion ports on a storage system only connect to PRI expansion ports. Otherwise, services are interrupted.
- Common and high-density disk enclosures cannot be connected to one expansion loop.
- Each expansion loop of high-density disk enclosures must be connected to two adjacent ports (excluding ports P1 and P2) of the 12 Gbit/s SAS interface module on a controller enclosure, for example, ports P0 and P1 or ports P2 and P3.
- If a storage system is configured with two or more disk enclosures, you are advised to form multiple expansion loops based on the number of expansion ports on the controller enclosure, and ensure that the disk enclosures are evenly distributed to each loop.
- A maximum of eight SAS disk enclosures can be connected to a pair of SAS ports. Three is recommended because performance deteriorates as the number of disk enclosures increases.
- A maximum of eight high-density disk enclosures can be connected to two pairs of SAS ports (two SAS ports are bonded). One is recommended because performance deteriorates as the number of disk enclosures increases.
- All disk enclosures in the same expansion loop must form two independent and redundant links to achieve optimal network reliability.
- The back-end loop of the same SAS interface module cannot connect to different models of high-density disk enclosures. For details about how to distinguish models of high-density disk enclosures, see How to Distinguish the Different Models of High-density Disk Enclosures?
