Adaptec 2820SA User Guide - Page 28

Selecting Disk Drives, Disk Drives for SAS Controllers - sata raid

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Chapter 4: Getting Started ● 28 Selecting Disk Drives When selecting disk drives for your RAID array, ensure that all the disk drives have the same performance level. You can use different-sized disk drives in the array, but the array will be limited to the capacity of the smallest and slowest disk drive. For more information, refer to the Adaptec Storage Manager User's Guide or online Help. Disk Drives for SAS Controllers Your SAS controller supports both SAS and SATA disk drives. For cable information, see page 29. Disk Drives for SATA Controllers Your SATA controller supports SATA disk drives only. You need one SATA cable for each disk drive you are connecting to your SATA controller. Disk Drives for SCSI Controllers Your SCSI controller supports Ultra320 SCSI disk drives. It also supports Ultra2 or higher SCSI disk drives and peripherals, but at performance levels less than Ultra320. Adaptec does not recommend using SCSI disk drives or peripherals older than Ultra2. Note: High-voltage Differential (HVD) disk drives are not supported and will damage your controller. If you are mixing single-ended (SE) disk drives with Low-voltage Differential (LVD) disk drives: ● Ensure proper termination by using a cable (like the one included in the kit) with a built-in multimode terminator and proper adapters. ● Disable termination on all the SE disk drives. ● Put LVD and SE disk drives on separate channels for the best performance. Note: If you mix SE and Ultra320 disk drives on the same channel, the performance of the Ultra320 disk drives is reduced to SE levels.

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Chapter 4: Getting Started
●
28
Selecting Disk Drives
When selecting disk drives for your RAID array, ensure that all the disk drives have the same
performance level. You can use different-sized disk drives in the array, but the array will be
limited to the capacity of the smallest and slowest disk drive.
For more information, refer to the
Adaptec Storage Manager User’s Guide
or online Help.
Disk Drives for SAS Controllers
Your SAS controller supports both SAS and SATA disk drives. For cable information, see
page 29
.
Disk Drives for SATA Controllers
Your SATA controller supports SATA disk drives only. You need one SATA cable for each disk
drive you are connecting to your SATA controller.
Disk Drives for SCSI Controllers
Your SCSI controller supports Ultra320 SCSI disk drives. It also supports Ultra2 or higher SCSI
disk drives and peripherals, but at performance levels less than Ultra320. Adaptec does not
recommend using SCSI disk drives or peripherals older than Ultra2.
Note:
High-voltage Differential (HVD) disk drives are not supported and will damage your
controller.
If you are mixing single-ended (SE) disk drives with Low-voltage Differential (LVD) disk
drives:
●
Ensure proper termination by using a cable (like the one included in the kit) with a built-in
multimode terminator and proper adapters.
●
Disable termination on all the SE disk drives.
●
Put LVD and SE disk drives on separate channels for the best performance.
Note:
If you mix SE and Ultra320 disk drives on the same channel, the performance of the
Ultra320 disk drives is reduced to SE levels.