Hot-Plug Hard Disk Drives; Auto Processor Bus Recovery; Storage Technologies; Hard Drive Technology - Compaq ProLiant 8500 Technology Brief

TC000604TB
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ECHNOLOGY RIEF
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Hot-Plug Capability
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When a power supply is hot swapped, the microcontroller governs the power-up and power-down
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sequence, enables the health drivers to calculate redundancy "on the fly," and informs the health
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drivers of changes in load. Compaq hot-plug power supplies are readily identifiable by their port-
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colored bezel, as shown in Figure 11.
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Figure 11: Front view of hot-plug power supply with port-colored bezel.
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Hot-Plug Hard Disk Drives

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The ProLiant 8500 server supports four 1-inch, Wide Ultra-3 SCSI, internal hot-plug hard disk
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drives. The internal drives can be controlled by an Integrated Smart Array Controller (see
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Technologies") to optimize them for OS and boot support. When the server is configured for
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maximum capacity, it can support 73 GB of internal storage. Capacity will increase in the future as
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new drive technologies emerge.
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Auto Processor Bus Recovery

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Auto processor bus recovery is a feature of the ProLiant 8500 server that maintains server
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availability in the unlikely event that one of the cache accelerators fails. If a cache accelerator fails,
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the server will go through the Automatic Server Recovery (ASR) process and reboot. Typically, a
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failed cache accelerator would prevent the server from rebooting; however, auto processor bus
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recovery enables the server to recover and maintain availability of the processor bus with the good
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cache accelerator. With the server still available, the administrator can replace the failed
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accelerator at the most convenient time.
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S T
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As corporations commit more critical information to computers, the requirements for more storage
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capacity and faster data movement are increasing at a startling rate. The Compaq ProLiant 8500
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server includes new storage technologies that help meet these requirements. New hard drive
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technology and a specially designed integrated array controller allow the ProLiant 8500 server to
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deliver the highest levels of external storage capacity faster and with more reliability.
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Hard Drive Technology

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The Compaq ProLiant 8500 server uses low-voltage differential (LVD) Ultra-3 SCSI hard drives.
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Ultra-3 SCSI hard drives use a 16-bit bus and a double pumped 40-MHz clock rate to achieve
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maximum transfer rates of 160 MB/s. This bus speed provides the performance demanded by
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today's data-intensive applications and prevents system performance from becoming I/O limited as
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. . drive throughputs increase.
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Port-colored bezel
"Storage