Part VI Tuning for Performance and Scalability in Visual Studio .NET

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Part VI Tuning for Performance and Scalability
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SCSI: SCSI rules in the server market A server system without SCSI drives is unthinkable to me and to many other experienced server administrators Fiver Channel disks: The Fiver Channel disk is the hottest and youngest drive technology, but it is not widely used because of high price and interconnectivity issues However, Fiver Channel drives are taking market share from SCSI in the enterprise or high-end storage arena If you need Fiver Channel disks, you should consider a very high-end drive subsystem, such as a storage area network (SAN) or a storage appliance
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In this chapter I assume that you are an EIDE or SCSI user
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Comprehending the acronyms
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Choosing a hard drive for a system (desktop or server) becomes unnecessarily difficult because of the flux of buzzwords in the drive technology market Table 22-1 defines common acronyms and terms to help you understand the differences between the various technologies, which often get buried under marketing hoopla
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Table 22-1 Common Acronyms or Terms for Hard Drive Technology
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Common Acronym or Term IDE ATA Fast-IDE or Fast-ATA EIDE Meaning Integrated Disk Electronics AT Attachment ATA is the superset of the IDE specifications Second-generation IDE Enhanced IDE It provides support for larger drives, more drives (four instead of two), and for other mass storage units such as tapes and CD-ROM By using a fast direct memory access (DMA) controller, this type of drive provides faster and less CPU-intensive transfer rates ATA Packet Interface It is a protocol used by EIDE tape and CD-ROM drives; similar in many respects to the SCSI protocol ATA-2 ATA-3 Standard Name ATA -1
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UltraDMA/33 or UDMA/33
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ATA-4
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ATAPI
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Common Acronym or Terms SCSI or narrow SCSI
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Meaning Small Computer System Interface The initial implementation of SCSI was designed primarily for narrow (8-bit), single-ended, synchronous or asynchronous hard drives and was very limited relative to today s SCSI It includes synchronous and asynchronous data transfers at speeds up to 5MB/second
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Standard Name SCSI-1
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Fast SCSI or Fast-10
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Fast SCSI uses 10 MHz bus instead of 5 MHz bus used in narrow SCSI On an 8-bit (narrow) SCSI-bus this increases the theoretical maximum speed from 5MB/second to 10MB/second On a 16-bit (wide) bus can have a transfer rate up to 20MB/second
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SCSI-2
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Ultra or Fast-20 SCSI
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Synchronous data transfer option, which allows up to 20 MHz data clocking on the bus and for 40MB/ second for the 16-bit (wide) bus, which is called Ultra Wide SCSI Synchronous data transfer option, which allows up to 40 MHz data clocking on the bus and 80MB/ second for the 16-bit (wide) bus, which is called Ultra2 Wide SCSI
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SCSI-3
Ultra 2 or Fast-40 SCSI
SCSI-3
Most people either go with IDE/EIDE hard drives or with SCSI drives Only a few keep both types in the same machine, which is not a problem
Tips on choosing a hard drive
Hard drive performance is critical to a Web server, and therefore you should consider high-end SCSI disk controllers and drives if you plan to run a high demand Web service The reliability of your hard disks is also very important; a disk failure can be a very time-consuming and catastrophic event to recover from Following are few tips to remember when choosing hard disks for your Web server
Part VI Tuning for Performance and Scalability
Make sure your Web server is using a high-end SCSI drive controller with a set of high-end SCSI drive drives The latest ultrawide SCSI drives are your best choice It s a good idea to use multiple drives on your Web server for example, you shouldn t keep your operating system and Web data on the same drive Use at least two drives: one for the operating system and another for data Keeping operating-system-specific software out of the way of the Web server is a good security measure as well Disks are also a common point of failure If you are concerned about drive failure, consider backing up your data on a regular basis If you can afford to get Redundant Array of Inexpensive Disks (RAID) subsystems, it s worth looking into RAID is essentially a group of smaller drives that act in concert to mimic a larger drive If one of the drives fails, the others take up the slack until the failed drive can be replaced Using RAID subsystems could mean high-performance drive I/O and reasonable data security for your Web server Don t get fooled into a slow hard drive Many people buy their PC servers from vendors who lure them into package deals that tend to feature a large IDE or EIDE drive I highly recommend that you avoid using IDE/EIDE drives for your Web server if you expect the server to function as more than a toy