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Hojbovej 18
Kobenhavn K, REGION SJALLAND 1121
The company had a DELL PowerEdge 2550 idle server purchased in 2001 that needed to be re-installed with FreeBSD 7.2. The configuration of this server is:

2U Dual Rack Server

Memory: 128 × 2 + 256 × 2 + 256 (5 slots in total, maximum support 4G of memory)

CPU: Two Intel® Pentium® III Microprocessors

Hard Disk: 4 36G SICI Hard Disks

Disk Array Card Model: Perc3/di

The original installation is Windows 2000, using RAID5, so only 101G of hard disk space.

Because it is the first direct contact with the disk array card, it began to feel a bit imaginary. Regardless of 3721 directly regardless of the array card, FreeBSD 7.2 is installed, the installation is very smooth, the biggest problem after the completion of the installation continue to report: Peripheral device failed to write. I began to think that this error will not be synchronized with RAID5 data. So I let the server run for 12 hours, the result is still this problem. Because the storage of raid5 is rather special, and before the data in raid5 is cleared, it can fail to synchronize. This poses a huge security risk for server management. So hard to come up with evil, make up the disk array card and RAID several ways.

RAID is an abbreviation of 'Redundant Array of Independent Disk'. Chinese meaning is an independent redundant disk array. Redundant disk array technology was born in 1987 and was proposed by the University of California, Berkeley. I summarize the proposed purpose of RAID is two: One is the combination of multiple hard drives, increase the capacity of the hard disk; one is to do a good job of data backup, so that one of the hard drives will not damage and cause other hard drives can not be used.

RAID has 0,1,2,3,4,5,6,7,8,9,10,50 and so on. The most commonly used are 0, 1, 5, and 10.

RAID 0, which has the largest capacity, equals the capacity of all hard disks and has the fastest speed. However, if one hard disk is broken, the entire data cannot be used.

RAID 1, the capacity is reduced by half, the speed is reduced, but the data is very safe and it is duplicative. Unplugging one of the hard disks does not have any effect on the system.

RAID 5 requires more than 3 hard disks. The hard disk capacity is equal to the number of hard disks minus 1. RAID5 read efficiency is high, writing efficiency is normal, and block-based collective access efficiency is good. Because parity codes are on different disks, reliability is increased, allowing individual disks to fail. RAID 5 also uses data check bits to ensure data security. However, instead of storing check bits of data on a single hard disk, RAID 5 stores the check bits of data segments interactively on each hard disk. In this way, if any one of the hard disks is damaged, the damaged data can be reconstructed according to the check bits on the other hard disks. Hard disk utilization is n-1. But it does not solve the parallelism of data transmission well, and the design of the controller is also very difficult.

RAID 10, which is a combination of RAID0 and RAID1, has both 0's high efficiency and 1's security. The biggest problem is that the cost is too high, requiring more than four even-numbered hard drives with only half the capacity.

In combination with the conditions of the DELL server (Perc3/di supports raid0,1,5,10), our service program requires less hard disk capacity, requires higher data speed for hard disk access, and requires comparative data security. . I give up the previous RAID5 and choose the higher cost raid10.

DELL Perc3/di raid 10 configuration method.

DELL Perc3/di setting method, I did not take pictures, take a look at the dell's picture ()

1, when the machine self-test, when prompted to press CTRL+A to enter the RAID BIOS interface.

2. Select the first Container Configuration Utility and press Enter.

3, select Initialize Drives, enter. Initialize the hard disk, I completely remove the previous files here, and so on the disk synchronization is fast.

4. Move the cursor to the hard disk and press INS to select the hard disk to the right in the Selected Drives box. After selection, press Enter to confirm.

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