SAS device | Any device that conforms to the SAS standard and is attached to the |
| SAS bus by a SAS cable. This includes SAS RAID controllers |
| (host adapters) and SAS peripherals. |
SATA | Acronym for Serial Advanced Technology Attachment. A physical storage |
| interface standard, SATA is a serial link that provides |
| connections between devices. The thinner serial cables allow for better |
| airflow within the system and permit smaller chassis designs. |
SMP | Acronym for Serial Management Protocol. SMP communicates topology |
| management information directly with an attached SAS expander device. |
| Each PHY on the controller can function as an SMP initiator. |
SSP | Acronym for Serial SCSI Protocol. SSP enables communication with |
| other SAS devices. Each PHY on the SAS controller can function as an |
| SSP initiator or SSP target. |
STP | Acronym for Serial Tunneling Protocol. STP enables communication with |
| a SATA II device through an attached expander. Each PHY on the SAS |
| controller can function as an STP initiator. |
stripe size | The total drive space consumed by a stripe not including a parity drive. |
| For example, consider a stripe that contains 64 Kbytes of drive space |
| and has 16 Kbytes of data residing on each drive in the stripe. In this |
| case, the stripe size is 64 Kbytes and the stripe element size is |
| 16 Kbytes. The stripe depth is four (four drives in the stripe). You can |
| specify stripe sizes of 8 Kbytes, 16 Kbytes, 32 Kbytes, 64 Kbytes, |
| 128 Kbytes, 256 Kbytes, 512 Kbytes, or 1 Mbyte for each virtual drive. |
| A larger stripe size produces improved read performance, especially if |
| most of the reads are sequential. For mostly random reads, select a |
| smaller stripe size. |
striping | Drive striping writes data across two or more drives. Each stripe spans |
| two or more drives but consumes only a portion of each drive. Each |
| drive, therefore, may have several stripes. The amount of space |
| consumed by a stripe is the same on each drive that is included in the |
| stripe. The portion of a stripe that resides on a single drive is a stripe |
| element. Striping by itself does not provide data redundancy; striping in |
| combination with parity provides data redundancy. |
Glossary of Terms and Abbreviations | |
| Copyright © 2009 by LSI Corporation. All rights reserved. |
