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Planning a Database Server Infrastructure
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Disk Sizing for the Operating System Partition
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You usually want the logical drive containing Windows and SQL Server to include a physical mirror so that you can quickly recover these essential system components in case of failure. A single physical disk should be enough to store this data, so in a RAID 1 scenario, you mirror this single disk on a second physical disk for a total of two disks for the logical drive. Most important to understand is that the operating system and SQL Server program do not normally require enough storage or throughput capacity to require additional drives. Use Table 1-7 to determine the actual storage requirements of each component of SQL Server 2005.
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Table 1-7
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Feature Database Engine and data files, Replication, and Full-Text Search Analysis Services and data files Reporting Services and Report Manager Notification Services engine components, client components, and rules components Integration Services Client Components Management Tools Development Tools SQL Server Books Online and SQL Server Mobile Books Online Samples and sample databases
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Disk Space Requirement 150 MB 35 KB 40 MB 5 MB 9 MB 12 MB 70 MB 20 MB 15 MB 390 MB
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To calculate the number, size, and configuration of the physical disk drives support ing your transaction log, you need to account for the throughput and storage require ments of the log, as you did with the database. To size for log throughput
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Lesson 3: Sizing the Disk Subsystem
requirements, you need to account only for the expected number of writes/sec caused by the database workload.
NOTE
Multiple log files
There is no performance benefit to using more than one log file per database. The only time to use more than one log file is when you run out of space on the drive currently holding the log file.
Suppose that you want to design a RAID configuration for the logical drive storing your log file. Assume that you are planning to use the same physical drives as those you are using for the database. (Recall that these drives have a throughput capacity of 300 IOPS, which means that the maximum recommended throughput for any of these drives in a production environment is 85 percent of 300, or 255 IOPS.) Next, if you are planning storage for the same database server, you have determined that your database workload will generate 600 reads/sec and 200 writes/sec during periods of peak usage. Because you are sizing for the transaction log, not the database, you need to look only at the number of writes: 200 writes/sec. But you still need to adjust the total number of I/Os for your choice of RAID, as you did with the database drives. For quick recovery, it is normally recommended that you store the transaction log on a mirrored drive or array, such as a RAID 1 or RAID 10. As noted earlier, the number of writes is doubled in all three of these environments. Therefore, your total IOPS in a RAID 1 or RAID 10 configuration is 400. When divided between two disks in a RAID 1, this load is reduced to 200 IOPS per disk. This falls below your maximum tar get throughput of 255 IOPS per disk, so a RAID 1 configuration is a suitable option for storing the transaction log in this example. In a RAID 10 scenario, the minimum number of disks used is always four. So, if you choose either of these options, the maxi mum expected throughput is reduced to 100 IOPS per disk. The size of the transaction log, which typically varies from a few MB to as much as 500 MB, depends on the use and function of the database as well as the frequency of the transaction log backup. In virtually all cases, the transaction log is small enough to fit on a single physical disk that you can then mirror in a RAID 1 configuration. Because the disk solution accommodates the space requirements of a transaction log, the size of the transaction log is not typically a factor in the disk design.
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