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2. Product Selection
Features
The most outstanding feature of the D8 Series is the expandable scalability. It enables small start
and online expansion of the scalability. Not only the scalability within the unit (referred to as node)
such as controller, cache and HDD, the D8 can expand its scalability by adding nodes. By this
scalability, the D8 Series can cover a broad range from low-end area to high-end area.
1
node
1
node
Internal Structure
The minimum configuration of the node consists of 5U Controller (DAC) and 2U Disk Enclosure (DE).
The controller of one node consists of Host Director (HD) to control the host I/F, Cache Module (CHE)
to control the cache memory, Disk Director (DD) to control the disk I/F and Local Switch (LSW) to
connect these cards and nodes at high speed. Additionally, each node of the D8 has 4 power supply
units, flash memories to save the data of cache memory, and batteries.
The minimum configuration of DAC consists of 2 HD's, 2 CHE's and 2 DD's, and each of them can
expand to 4 in each node. (CHE can individually expand to 4 but as for HD and DD, either of them
can selectively expand to 4.)
Each HD has 4 FC ports (8Gbps) so that it can expand to 4 HD's with 16 FC ports. DD has SAS
(Serial Attached SCSI) of 3Gbps for the I/F between DAC and DE, WideLink of 4 ports in parallel
realizing a 12Gbps broadband connection.
DE can have up to 12 units of SAS HDD and SATA HDD together and can connect up to 16 unit of
DE and 192 units of disk drive to 2 units of DD. When the DD expands to 4 units, up to 32 units of
DE and 384 units of disk drive can be connected.
As for the disk drive, you can mount SAS drive of 147GB (15,000rpm), 300GB (15,000rpm), 450GB
(15,000rpm), and 600GB(15,000rpm) and SATA drive of 750GB (7,200rpm),1,000GB (7,200rpm), and
2,000GB(7,200rpm) together.
As for cache memory, the standard configuration is 8GB and it can expand up to 32GB in one node.
When available, up to 4 nodes can congregate. In this case, it has scalability of up to 64 host ports,
up to 1536 disk drives and up to 128GB of cache memory. If there are multiple nodes in a unit, it can
access disk drives of any node from a host port, and it is also possible to make a certain host port to
access to certain HDD's by AccessControl.
node
node
4 nodes
4 nodes
H D
C HE
2
2
nodes
nodes
H D
HD
HD
HD
SW
SW
SW
C H E
C HE
C HE
C HE
D D
DD
DD
DD
DD
D A C
D A C
D A C
HD
HD
HD
SW
C H E
C HE
C HE
D D
DD
DD
D A C
4
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