Compaq 307560-001 Compaq ProLiant 2500 Server Technology - Page 11

Non-Hot-Plug, Hard Drives, Power Switch, 5 Diskette Drive, EIDE CD-ROM Drive, Two available,

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201A/1196 TECHNOLOGY BRIEF (cont.) ... The level of benefit derived from Ultra SCSI depends upon two factors: the type of data reads and data block size. Seek times for non-sequential reads create bus overhead. Since each data block also creates bus overhead, the smaller the data blocks, the greater the total overhead. Consequently, Ultra SCSI controllers provide maximum benefit when transferring large data blocks accessed by sequential reads. As illustrated in Figure 8, the new ProLiant 2500 chassis includes four drive bays for removable media: • one dedicated to a 3.5-inch diskette drive, • one dedicated to a CD-ROM drive connected to an EIDE controller, and • two undedicated half-height bays. Power Switch 3.5" Diskette Drive EIDE CD-ROM Drive Two available half height bays 1.6" Non-Hot-Plug Hard Drives Figure 8. Front view of the Compaq ProLiant 2500 Server chassis showing four drive bays for removable media and a hard drive cage containing four 1.6-inch non-hot-plug drives. The ProLiant 2500 contains an EIDE CD-ROM. In designing a new departmental and remote office server, Compaq elected to use the EIDE CD-ROM to leave the SCSI bus dedicated to the hard drives. Because CD-ROM drives have significantly lower utilization and data rates than server hard drives, the EIDE connection does not degrade CD-ROM drive performance. The two available half-height bays can be used to support removable media, a full-height DLT tape backup drive, or two non-hot-plug hard drives. The ProLiant 2500 ships standard with one SCSI bus connected point-to-point from the backplane to the disk drive cage. Since Ultra SCSI controllers transfer data at such a high speed, data integrity becomes a concern. Compaq chose a dedicated, point-to-point connection to control the integrity of the signal to and from the hard drives. The ProLiant 2500 can support either an internal or an external array of DLT backup drives if a second SCSI controller is available. The customer can add a DLT array in one of two ways: • by purchasing the ProLiant 2500 array model (ProLiant 2500 6/200H Model 1S, which has a second SCSI controller built in) or • by purchasing a standard ProLiant 2500 model and installing a SCSI controller in an expansion slot. 11

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T
ECHNOLOGY
B
RIEF
(cont.)
11
201A/1196
The level of benefit derived from Ultra SCSI depends upon two factors:
the type of data reads
and data block size.
Seek times for non-sequential reads create bus overhead.
Since each data
block also creates bus overhead, the smaller the data blocks, the greater the total overhead.
Consequently, Ultra SCSI controllers provide maximum benefit when transferring large data
blocks accessed by sequential reads.
As illustrated in Figure 8, the new ProLiant 2500 chassis includes four drive bays for removable
media:
•
one dedicated to a 3.5-inch diskette drive,
•
one dedicated to a CD-ROM drive connected to an EIDE controller, and
•
two undedicated half-height bays.
Figure 8.
Front view of the Compaq ProLiant 2500 Server chassis showing four drive bays for removable
media and a hard drive cage containing four 1.6-inch non-hot-plug drives.
The ProLiant 2500 contains an EIDE CD-ROM.
In designing a new departmental and remote
office server, Compaq elected to use the EIDE CD-ROM to leave the SCSI bus dedicated to the
hard drives.
Because CD-ROM drives have significantly lower utilization and data rates than
server hard drives, the EIDE connection does not degrade CD-ROM drive performance.
The two available half-height bays can be used to support removable media, a full-height DLT
tape backup drive, or two non-hot-plug hard drives.
The ProLiant 2500 ships standard with one SCSI bus connected point-to-point from the backplane
to the disk drive cage.
Since Ultra SCSI controllers transfer data at such a high speed, data
integrity becomes a concern.
Compaq chose a dedicated, point-to-point connection to control the
integrity of the signal to and from the hard drives.
The ProLiant 2500 can support either an internal or an external array of DLT backup drives if a
second SCSI controller is available.
The customer can add a DLT array in one of two ways:
•
by purchasing the ProLiant 2500 array model (ProLiant 2500 6/200H Model 1S, which has a
second SCSI controller built in) or
•
by purchasing a standard ProLiant 2500 model and installing a SCSI controller in an
expansion slot.
1.6” Non-Hot-Plug
Hard Drives
Power Switch
3.5” Diskette Drive
EIDE CD-ROM Drive
Two available
half height bays
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