Chapter 2: Hardware Overview
StorNext M660 Components
StorNext M660 Metadata Appliance Hardware Guide
23
into two stripe groups (SGs): SG0 combines three LUNs into the
metadata and journal for the shared file system. SG1 combines three
LUNs into the shared HA file system, and includes the StorNext Storage
Manager database.
The Metadata Array also contains redundant power supplies and dual
Tahoe or Snowmass controllers. Each Tahoe controller provides two 12
Gb Serial Attached SCSI (SAS) host ports. Each Snowmass controller
provides two 6 Gb Serial Attached SCSI (SAS) host ports. StorNext
Metadata Arrays connect to StorNext MDC nodes via 6 Gb SAS.
Additional storage can be added to the Metadata Array by purchasing
an expansion kit.
Hard drives are supplied in hot-swappable drive carriers that fit in the
hard-drive bays.
The StorNext M660 Metadata Array has a series of indicators and
buttons located on the front and back of the array:
•
Metadata Array – Front View
on page 24
•
Metadata Array – Rear View
on page 25
Note:
There are two generations of Metadata Array controller
currently in use. While both generations of the controller use
the same SAS connection order, from left to right, different
cables are used for the connections. The Tahoe controller is
connected with a cable containing both a 12Gb SAS (square)
connection, which is attached to the Tahoe controller, and a
6Gb SAS (rectangular) connection, which is attached to the
MDC nodes and the Expansion Unit (if used). The previous
generation Snowmass Controller cable contains 6Gb
connections on both ends. Use the appropriate SAS cables for
the controllers in your Metadata Array.
Caution:
Do not mix and match different generation controllers. Use
only Tahoe controllers in systems which originally
contained Tahoe controllers, and use only Snowmass
controllers in systems which originally contained
Snowmass controllers.
