Glossary, Continued
Spare | A hard drive available to back up the data of other drives. |
Stripe Size | The amount of data contiguously written to each disk. You can specify stripe sizes of 4 |
| KB, 8 KB, 16 KB, 32 KB, 64 KB, and 128 KB for each logical drive. For best |
| performance, choose a stripe size equal to or smaller than the block size used by the host |
| computer. |
Stripe Width | The number of disk drives across which the data are striped. |
Striping | Segmentation of logically sequential data, such as a single file, so that segments can be |
| written to multiple physical devices in a |
| the processor can read or write data faster than a single disk can supply or accept it. |
| While data is being transferred from the first disk, the second disk can locate the next |
| segment. Data striping is used in some modern databases and in certain RAID devices. |
Terminator | A resistor connected to a signal wire in a bus or network for impedance matching to |
| prevent reflections, e.g., a 50 ohm resistor connected across the end of an Ethernet cable. |
| SCSI chains and some LocalTalk wiring schemes also require terminators. |
An extension of | |
| on an |
An extension of | |
| on an |
Virtual Sizing FlexRAID Virtual Sizing is used to create a logical drive up to 80 GB. A maximum of eight logical drives can be configured on a RAID controller and RAID migration is possible for all logical drives except the eighth. Because it is not possible to do migration on the last logical drive, the maximum space available for RAID migration is 560 GB.
Wide SCSI A variant on the
130MegaRAID Express 500 Hardware Guide