CHAPTER 4: Advanced Hardware Setup
40
How it makes file storage cheaper
Because RAID 0 lets your computer see multiple hard drives as
a single drive, you can install several lower capacity (less
expensive) drives and have the same single-drive storage
simplicity and capacity as a larger, more expensive hard drive.
Drawbacks
Unfortunately, RAID 0 lets multiple drives behave as one in
another way. If part of the array fails (such as a hard drive
crashing), the entire array fails. Because the drives are treated
like a single drive, parts of files (including operating system
files) can be spread across several drives, leaving the computer
with only file fragments if one drive fails. Regular and frequent
backups are critical.
Another drawback is that RAID 0 treats each hard drive as if it
has the storage capacity of the smallest drive in the array. So
if you have three drives (300 GB, 250 GB, and 200 GB) in a
RAID 0 array, your computer only recognizes 600 GB total
capacity.
RAID 1 for security
RAID 1 maintains a complete copy of all files on each physical
hard drive in the array. Maintaining simultaneous, complete
copies of files across multiple hard drives is called
mirroring
.
If a drive fails, the mirrored drive takes over and acts as the
primary drive.
In the following graphic, each letter represents a unique block
of data, and each column represents a separate hard drive.
File reading performance (
seek time
) is increased using the
same methods that RAID 0 uses, although writing speed is the
same as if writing to a single hard drive.
A
B
C
A
B
C
RAID 1
8513162.book Page 40 Tuesday, May 20, 2008 4:09 PM
Содержание FX542X
Страница 1: ...REFERENCE GUIDE 8513162 book Page a Tuesday May 20 2008 4 09 PM...
Страница 2: ...8513162 book Page b Tuesday May 20 2008 4 09 PM...
Страница 10: ...CHAPTER 1 About This Reference 4 8513162 book Page 4 Tuesday May 20 2008 4 09 PM...
Страница 11: ...CHAPTER2 5 Checking Out Your Computer Front Back 8513162 book Page 5 Tuesday May 20 2008 4 09 PM...
Страница 18: ...CHAPTER 2 Checking Out Your Computer 12 8513162 book Page 12 Tuesday May 20 2008 4 09 PM...
Страница 86: ...CHAPTER 5 Upgrading Your Computer 80 8513162 book Page 80 Tuesday May 20 2008 4 09 PM...
Страница 104: ...CHAPTER 6 Maintaining Your Computer 98 8513162 book Page 98 Tuesday May 20 2008 4 09 PM...
Страница 142: ...APPENDIX A Legal Notices 136 8513162 book Page 136 Tuesday May 20 2008 4 09 PM...
Страница 152: ...146 Index 8513162 book Page 146 Tuesday May 20 2008 4 09 PM...
Страница 153: ...8513162 book Page 147 Tuesday May 20 2008 4 09 PM...
Страница 154: ...MAN BTX FX EREC HW REF GDE R0 5 08 8513162 book Page 148 Tuesday May 20 2008 4 09 PM...