HP StorageWorks 4000 Compaq RAID Array 4000 Overview - Page 5

StorageWorks RAID Array 4000 Controllers

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Compaq RAID Array 4000 Overview 5 A single RA4000 accommodates up to eight 1.6-inch or twelve 1-inch Wide-Ultra SCSI-3, Fast-Wide SCSI-2 or Fast SCSI-2 drives. As Table 1 shows, a single, fully populated RA4000 can provide a total capacity of up to 291.2 GB using eight hard disk drives. For installations in which improved performance (spindle density for example) is more important than maximum capacity, 12 hard drives placed in an RA4000 can provide up to 218.4 GB of capacity. Table 1. Storage capacity of a single Compaq StorageWorks RAID Array 4000 Maximum Number of Drives 8 8 8 12 12 12 Drive Size (inches) 1.6 1.6 1.6 1.0 1.0 1.0 Native Capacity per Drive (gigabytes) 36.4 18.2 9.1 18.2 9.1 4.3 Maximum Total Capacity (gigabytes) RAID 0 291.2 RAID 1 145.6 RAID 4 or 5 254.8 145.6 72.8 72.8 127.4 36.4 63.7 218.4 109.2 200.2 109.2 51.6 54.6 100.1 25.8 47.3 StorageWorks RAID Array 4000 Controllers The RA4000 Controller is an intelligent Fibre Channel-to-SCSI array3 controller integrated into the RA4000 solution. The controller is based on the Compaq SMART-2 architecture and has two Wide-Ultra SCSI-3 channels. Each channel can transfer data at 40 megabytes per second (MB/s) for a total of 80 MB/s possible internal bandwidth. The array controller-to-host interface is Fibre Channel for high-speed connection to the server. The Fibre Channel interface can transfer data to the server at burst rates of 100 MB/s. The RA4000 Controller: • Supports RAID4 0, 0+1, 1, 4, and 5. • Supports multiple logical drives and online capacity expansion within the array. • Features sixth-generation Compaq RAID technology and components. • Can have a total of 64 MB of usable cache (16 MB read and 48 MB user-selectable read/write). The cache is scalable up to 5.6 GB in an 8-slot, single server environment. The RA4000 Redundant Controller is the same controller as the standard RA4000 controller with redundancy support firmware embedded that adds higher availability not found previously in Compaq storage systems. The RA4000 Redundant Controller fully supports Compaq Insight Manager, Pre-Failure Warranty, and Fibre Channel Host Adapter failover. The RA4000 Controller and RA4000 Redundant Controller supports Wide-Ultra SCSI-3, Fast-Wide SCSI-2, or Fast SCSI-2 drives. Use of SCSI technology inside the RA4000 allows customers to use existing SCSI disk drives. Since hard disk drives are the most costly part of a storage system, this compatibility can reduce the cost of implementing an RA4000. 3 An array is a set of disk drives that are physically grouped together and can be subdivided into logical drives consisting of one or more disks in the set. 4 Redundant Array of Independent Disks. RAID levels are methods that improve array performance and provide for protection of the data on disks. ECG0205699A

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Compaq RAID Array 4000 Overview
5
ECG0205699A
A single RA4000 accommodates up to eight 1.6-inch or twelve 1-inch Wide-Ultra SCSI-3,
Fast-Wide SCSI-2 or Fast SCSI-2 drives. As Table 1 shows, a single, fully populated RA4000
can provide a total capacity of up to 291.2 GB using eight hard disk drives. For installations in
which improved performance (spindle density for example) is more important than maximum
capacity, 12 hard drives placed in an RA4000 can provide up to 218.4 GB of capacity.
Table 1.
Storage capacity of a single Compaq StorageWorks RAID Array 4000
Maximum Total Capacity (gigabytes)
Maximum
Number of
Drives
Drive Size
(inches)
Native Capacity
per Drive
(gigabytes)
RAID 0
RAID 1
RAID 4 or 5
8
1.6
36.4
291.2
145.6
254.8
8
1.6
18.2
145.6
72.8
127.4
8
1.6
9.1
72.8
36.4
63.7
12
1.0
18.2
218.4
109.2
200.2
12
1.0
9.1
109.2
54.6
100.1
12
1.0
4.3
51.6
25.8
47.3
StorageWorks RAID Array 4000 Controllers
The RA4000 Controller is an intelligent Fibre Channel-to-SCSI array
3
controller integrated into
the RA4000 solution. The controller is based on the Compaq SMART-2 architecture and has two
Wide-Ultra SCSI-3 channels. Each channel can transfer data at 40 megabytes per second (MB/s)
for a total of 80 MB/s possible internal bandwidth. The array controller-to-host interface is Fibre
Channel for high-speed connection to the server. The Fibre Channel interface can transfer data to
the server at burst rates of 100 MB/s.
The RA4000 Controller:
•
Supports RAID
4
0, 0+1, 1, 4, and 5.
•
Supports multiple logical drives and online capacity expansion within the array.
•
Features sixth-generation Compaq RAID technology and components.
•
Can have a total of 64 MB of usable cache (16 MB read and 48 MB user-selectable
read/write). The cache is scalable up to 5.6 GB in an 8-slot, single server environment.
The RA4000 Redundant Controller is the same controller as the standard RA4000 controller with
redundancy support firmware embedded that adds higher availability not found previously in
Compaq storage systems. The RA4000 Redundant Controller fully supports Compaq Insight
Manager, Pre-Failure Warranty, and Fibre Channel Host Adapter failover.
The RA4000 Controller and RA4000 Redundant Controller supports Wide-Ultra SCSI-3,
Fast-Wide SCSI-2, or Fast SCSI-2 drives. Use of SCSI technology inside the RA4000 allows
customers to use existing SCSI disk drives. Since hard disk drives are the most costly part of a
storage system, this compatibility can reduce the cost of implementing an RA4000.
3
An array is a set of disk drives that are physically grouped together and can be subdivided into logical drives consisting of one or
more disks in the set.
4
Redundant Array of Independent Disks. RAID levels are methods that improve array performance and provide for protection of the
data on disks.