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Architecture and Components 2-11
Hitachi Universal Storage Platform V/VM User and Reference Guide
Hard Disk Drives
The Universal Storage Platform V/VM uses disk drives with fixed-block-
architecture (FBA) format.
Table 2-3 lists and describes the currently available
hard disk drives: 72 GB, 146 GB, 300 GB, 400 GB, and 750 GB.
Table 2-3 Disk Drive Specifications
Disk Drive
Size
Formatted
Capacity*
Revolution
Speed
Interface Interface Data Transfer Rate
(maximum)
72 GB 71.50 GB 15,000 rpm FC 400 MB/s
146 GB 143.76 GB 15,000 rpm FC 400 MB/s
300 GB 288.20 GB 10,000 rpm FC 200 MB/s
300 GB 288.20 GB 15,000 rpm FC 400 MB/s
400 GB 393.85 GB 10,000 rpm FC 400 MB/s
750 GB 738.62 GB 7,200 rpm SATA 300 MB/s
* The storage capacity values for the disk drives (raw capacity) are calculated based on the following
values: 1 KB = 1,000 bytes, 1 MB = 1,000
2
bytes, 1 GB = 1,000
3
bytes, 1 TB = 1,000
4
bytes.
Each disk drive can be replaced non-disruptively on site. The USP V/VM utilizes
diagnostic techniques and background dynamic scrubbing that detect and
correct disk errors. Dynamic sparing is invoked automatically if needed. For an
array group of any RAID level, any spare disk drive can back up any other disk
drive of the same rotation speed and the same or lower capacity anywhere in
the storage system, even if the failed disk and the spare disk are in different
array domains (attached to different BED pairs). The USP V/VM can be
configured with up to 16 spare disk drives. The standard configuration
provides one spare drive for each type of drive installed in the storage system.
The Hi-Track monitoring and reporting tool detects disk failures and notifies
the Hitachi Data Systems Support Center automatically, and a service
representative is sent to replace the disk drive.
Note: The spare disk drives are used only as replacements and are not
included in the storage capacity ratings of the storage system.
Service Processor
The Universal Storage Platform V/VM includes a built-in custom PC called the
service processor (SVP). The SVP is integrated into the controller and can only
be used by authorized Hitachi Data Systems personnel. The SVP enables the
Hitachi Data Systems representative to configure, maintain, service, and
upgrade the storage system. The SVP also provides the Storage Navigator
functionality, and it collects performance data for the key components of the
USP V/VM to enable diagnostic testing and analysis. The SVP is connected with
a service center for remote maintenance of the storage system.
Note: The SVP does not have access to any user data stored on the Universal
Storage Platform V/VM.