HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - Page 58
RAID level, Application and I/O Pattern Performance
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Table 5 RAID Level Comparison: Application and I/O Pattern Performance Characteristics RAID level Application and I/O Pattern Performance RAID 0 RAID 0 is a good choice in the following situations: - Data protection is not critical. RAID 0 provides no data redundancy for protection against disk failure. - Useful for scratch files or other temporary data whose loss will not seriously impact system operation. - High performance is important. RAID 1 RAID 0/1 RAID 1 is a good choice in the following situations: - Speed of write access is important. - Write activity is heavy. - Applications need logging or recordkeeping. - Daily updates need to be stored to a database residing on a RAID 5 group. The database updates on the RAID 1 group can be copied to the RAID 5 group during off-peak hours. RAID 0/1 is a good choice in the following situations: - Speed of write access is important. - Write activity is heavy. - Applications need logging or recordkeeping. - Daily updates need to be stored to a database residing on a RAID 5 group. The database updates on the RAID 1 group can be copied to the RAID 5 group during off-peak hours. RAID 3 RAID 3 is a good choice in the following situations: - Applications using I/O large sequential transfers of data, such as multimedia applications. - Applications on which write operations are 33% or less of all I/O operations. RAID 5 RAID 5 is a good choice in the following situations: - Multi-tasking applications using I/O transfers of different sizes. - Database repositories or database servers on which write operations are 33% or less of all I/O operations. - Multi-tasking applications requiring a large history database with a high read rate. - Transaction processing is required. 58 Disk Array High Availability Features