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Disk3
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Figure 2-2 EIDE and SCSI hard drive technologies
2:
Installing PostgreSQL on Windows
for each channel The upside to this, though, is that you can often put three or four SCSI controller cards in a single server, allowing for lots of hard drives Most workstation systems use EIDE disk technology While this is a relatively inexpensive disk controller technology, EIDE technology is not the fastest disk access technology available Unfortunately, some low-end server systems also use EIDE disk technology Most high-end server systems use SCSI disk technology As a whole, SCSI disks outperform EIDE disks when it comes to disk access speeds However, newer EIDE technology is improving the data access speeds to approach those of SCSI drives In a high-performance database server, though, SCSI disks are almost always preferred The ability to easily add multiple hard drives is a necessity when considering the second feature required for a good server hard drive system, discussed next The second hard drive feature is the type of fault tolerance used on the hard drive system On a workstation system, there is often just one disk drive with no fault tolerance This is fine, until something goes wrong with the disk drive A drive failure can mean catastrophic results for your database (remember from 1, durability is a key feature of an ACID-compliant system) If a hard drive crashes, the transaction log file is lost, along with all of the transactions made to the database since the last backup To help lessen the impact of disk problems, administrators have resorted to using a technology called Redundant Array of Inexpensive Disks (RAID) RAID technology provides for several different techniques to safeguard stored data Each of these techniques requires using multiple hard drives Because of this requirement, almost all RAID configurations are implemented using SCSI technology, which easily accommodates large numbers of disk drives In a RAID disk configuration, one disk in a multi-disk configuration can fail without losing data This is possible using a logical disk volume structure Although there are multiple disks on the system, the operating system (Windows) treats them as a single logical disk Data is put on the multiple disks in such a manner that the data contained on a single failed drive can be recovered based on the data placed on the other active drives There are multiple levels of RAID technology available Each one configures the multiple disks in a slightly different manner, providing different levels of data security Table 2-1 shows the levels of RAID that are commonly available in modern-day Windows servers The trick for database administrators is to pick the RAID level that gives the best performance and the most data security In each of these standard RAID levels, performance is traded for data redundancy In the RAID 0 method, data write speeds are improved as the data is spread out over multiple disks, minimizing the amount of time the disk write heads must travel Read speeds are also increased, as the disk head travels a shorter distance to pick up each piece of data While RAID 0 systems improve disk access speeds, they do not have fault tolerance If one of the striped disks goes bad, you lose all of the data on the system The RAID 1 approach solves the fault-tolerance problem, as a complete duplicate hard drive is available at all times However, this comes at the cost of disk access times Since both disks must always be in sync, data must always be written twice, once on each disk
PostgreSQL 8 for Windows
RAID Level RAID 0
Name Striped set
Description Data is split (striped) evenly between two or more disks Each block of data is stored on a different disk Data is duplicated on two separate disks Each disk is a complete duplicate of the other
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