Intel(R) Matrix Storage Manager User's Manual - Fujitsu UK

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RAID 1 (Mirroring) 14 User's Manual R
R RAID 5 (Striping with Parity) 5 RAID 5 (Striping with Parity) A RAID 5 array contains three or more hard drives where the data is divided into manageable blocks called strips. Parity is a mathematical method for recreating data that was lost from a single drive, which increases fault-tolerance. The data and parity are striped across all the hard drives in the array. The parity is striped in a rotating sequence to reduce bottlenecks associated with the parity calculations. The capacity of a RAID 5 array is the size of the smallest drive multiplied by one less than the number of drives in the array. The equivalent of only a single hard drive is used to store the parity information, allowing for fault-tolerance with less than the 50% capacity reduction of RAID 1. For example, three 400 GB hard drives in a RAID 5 array will appear as a single 800 GB hard drive to the operating system. The primary benefits of RAID 5 include capacity and data protection. Because parity is used for data protection, up to 75% of the total drive capacity is usable. Further, any single drive can fail and it is possible to rebuild the data after replacing the failed hard drive with a new drive. However, the extra work of calculating the missing data will degrade the write performance to the RAID 5 volume while the volume is being rebuilt. The read performance of a RAID 5 array is greater than that of a single drive because data can be read from multiple disks simultaneously. Disk writes do not realize the same benefit because parity must be calculated and written to all the drives. To enhance the write performance of RAID 5, Intel® Matrix Storage Manager software has implemented a RAID 5 volume write-back cache and coalescer. The volume write-back cache allows writes to be buffered and improves coalescing. The cache is disabled by default, but can be enabled by the user through the Intel® Matrix Storage Console. An Uninterrupted Power Supply (UPS) is recommended for use if the cache is enabled. The coalescer allows write requests to be combined into larger requests to reduce the number of I/Os per write for parity calculations. The coalescer is enabled by default, and the user does not have the option to disable it. User's Manual 15
Page 1 and 2: Intel ® Matrix Storage Manager Int
Page 3 and 4: R Contents 1 Scope of This Document
Page 5 and 6: R 20.6 Generate and View a Report u
Page 7 and 8: R Revision History Revision Number
Page 9 and 10: R Scope of This Document 1 Scope of
Page 11 and 12: Figure 1. RAID 0 R 3 RAID 0 (Stripi
Page 13: Figure 2. RAID 1 R 4 RAID 1 (Mirror
Page 17 and 18: Figure 4. RAID 10 R 6 RAID 10 (RAID
Page 19 and 20: R Matrix RAID (Two Volumes Per Arra
Page 21 and 22: R 9 Serial ATA (SATA) 9.1 Descripti
Page 23 and 24: R Advanced Host Controller Interfac
Page 25 and 26: R 11 Intel® Matrix Storage Manager
Page 27 and 28: R Configuring BIOS for Intel Matrix
Page 29 and 30: R Intel Matrix Storage Manager Opti
Page 37 and 38: R 3. Confirm the volume deletion by
Page 39 and 40: R 4. Confirm the selection by press
Page 41 and 42: R 14.2 Installation Using F6 Method
Page 43 and 44: R Installing the Intel Matrix Stora
Page 45 and 46: R 15.3.3 Installation: Uninstall Wa
Page 47 and 48: R Installing the Intel Matrix Stora
Page 49 and 50: R 15.3.7 Installation: Setup Status
Page 51 and 52: R Double-click on the ‘Sys
Page 53 and 54: R Issues During Installation 16 Iss
Page 55 and 56: R “RAID Ready” Warning: This op
Page 57 and 58: R “RAID Ready” 9. While the mig
Page 59 and 60: R 6. Click on the ‘Next’ button
Page 61 and 62: R “RAID Ready” 8. Select a RAID
Page 63 and 64: R “RAID Ready” 11. In the left-
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R “RAID Ready” 13. Use the fiel
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R 1. Complete one of the following
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R Uninstalling the Intel Matrix Sto
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R Unattended Installation Under Win
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R 20 Intel® Matrix Storage Console
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R Drive’ action instead (refer to
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R RAID Level: Select the desired RA
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R 20.3.4 Specify Volume Size Intel
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R Intel® Matrix Storage Console 20
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R Intel® Matrix Storage Console Wh
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R 21 Troubleshooting Please refer t
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R 7. After the RAID 1 volume rebuil
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R Troubleshooting 6. From the Volum
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R 21.3 Larger Source Hard Drive Err
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R How to Identify the Intel Chipset
Page 95 and 96:
R B.4 Troubleshooting Intel Chipset
Page 97 and 98:
R The following illustrations show
Page 99 and 100:
R C.9 Theoretical Transfer Rates As
Page 101:
R Port3 Serial ATA port (connector)
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Intel(R) Matrix Storage Manager User's Manual - Fujitsu UK

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