|
|
|
RAID-1 (Disk Mirroring)
+-------------+
| |
| +----------+
| |Disk +-------+-----+-------+
| |Controller| | | Disk 1|
| +----------+ | +-------+
| | +-----+-------+
| | | Disk 2|
+-------------+ +-------+
Disk mirroring involves duplicating the data from one disk onto a second using a single controller.
Disk duplexing is the same as mirroring in all respects, except that the disks are attached to seperate controllers.
The server can now tolerate the loss of one disk controller, as well as or instead of a disk, without loss of the disk
subsystem's availibility or the customer's data. Since each disk is attached to a seperate controller, performance and
throughput may be further improved.
RAID-1 (Disk Duplexing)
+-------------+
| |
| +----------+
| |Disk +-------------+-------+
| |Controller| | Disk 1|
| +----------+ +-------+
| +----------+
| |Disk +-------------+-------+
| |Controller| | Disk 2|
| +----------+ +-------+
| |
+-------------+
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