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Evaluating Data Protection Solutions
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Attribute Cost Performance (throughput) Performance (access times) Hard disk speed Number of devices per channel CPU requirements
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IDE 2
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I/O is handled by the SCSI controller, less burden is placed on the CPU. Also, data transfers can occur simultaneously that is, multiple devices can communicate on the same bus at the same time in parallel. This also increases performance. An added benefit of the SCSI specification is that it supports the use of both external and internal devices, which enables you to use many more peripherals than will fit inside a server chassis. In some implementations, systems administrators may choose to use both the IDE and SCSI subsystems in the same machine. This can provide for low-cost support of peripherals that don t require very high performance while at the same time reducing costs. More important disk subsystems might then be attached to SCSI controllers. Table 5-1 compares the basic features of IDE and SCSI controllers and devices. Table 5-2 lists the maximum speeds achievable by devices of various SCSI specifications. There are several aspects of these bus speeds to keep in mind when working with SCSI devices in the real world. First, speed estimates are normally based on the maximum throughput capacity of a SCSI adapter, not the bandwidth of the devices it connects. Therefore, if you have one hard disk connected to an 80MB/sec controller, it s highly unlikely that you ll see that level of throughput. Second, there can be some confusion over the meanings of various standards, so you should always verify actual performance statistics with your hardware vendor before making a purchasing decision. Finally, there are many different types of SCSI connectors used for connecting internal and external SCSI devices. Be sure that you know which types of cables and connections you ll need in order to implement your chosen solution.
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Lower cost of devices and controllers Slower (up to 66MB/sec) Slower (typically ~10ms) 5400rpm to 7200rpm
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High in older drives/ controllers; low in newer ones with DMA technology Internal only
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Table 5-1.
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Comparing IDE and SCSI Interfaces
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SCSI Higher cost of devices and controllers Faster (up to 80MB/sec) Faster (typically < 8ms) 7200rpm to 10,000+rpm 8 (including the controller) Low (data exchange usually managed by SCSI controller) Internal and/or external
SQL Server 7 Backup & Recovery
SCSI Standard SCSI-2 SCSI-2 (Fast/Wide) UltraSCSI UltraSCSI (Ultra Wide) Ultra2 SCSI Ultra 160/m (proposed) Ultra3 SCSI
Bus Speed 10MB/sec 20MB/sec 20MB/sec 40MB/sec 80MB/sec 160MB/sec 160MB/sec
Table 5-2.
SCSI Standards
When dealing with SQL Server and other relational databases that manage their own write operations, it s extremely important to understand the potential effects of writecaching technologies. The basic idea behind write caching is to increase write performance of the disk subsystem. This is achieved by queuing up several requests to record information to the disks in RAM or on the hardware controller itself. Programs and the OS think that the information has been committed to disk when actually it has not. The beneficial effect is that multiple write operations can be performed at the same time, thus increasing performance. The drawback, however, is that if an unexpected failure or restart of the server occurs (most commonly due to a loss of power or an OS crash), data might be left in an inconsistent state. When dealing with RDBMSs, such as SQL Server 7, this can leave files in an inconsistent state. To avoid this type of problem, many modern disk controllers contain a battery backup on the controller itself. In the event of a power failure, the battery backup ensures that information that has not yet been committed to disk is retained in memory. When the controller is again powered on, it can then store the information, thus ensuring consistency in the files. Despite these features, it might still be worthwhile to disable write caching, especially on servers whose primary function is running SQL Server 7.
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