HP 226593-B21 Smart Array 5i Plus Controller and Battery Backed Write Cache En - Page 93

Appendix D: Hard Drive Installation and Replacement, General Information About Hard Drive Failure

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D Hard Drive Installation and Replacement Each SCSI channel on a Smart Array controller supports up to 14 drives. Drives can be of the Wide Ultra3 SCSI or Wide Ultra2 SCSI type. Each drive on a SCSI bus must have a unique ID value in the range 0 to 15 (except ID 7, which is reserved for controller use). This value is set automatically on hotpluggable drives in Compaq ProLiantTM servers and storage systems, but values for other drives must be set manually. • Do not terminate the drives. Compaq servers and internal cabling provide the required termination of the SCSI bus. • Do not use drives of different capacity in the same array. The excess capacity of larger drives cannot be used by the array and is wasted. • Do not combine hot-pluggable drives with non-hot-pluggable drives on the same SCSI bus. Hard drives that are currently supported by the Smart Array Controller are listed at www.compaq.com/products/storageworks/. General Information About Hard Drive Failure When a hard drive fails, all logical drives that are in the same array will be affected. Each logical drive in an array may be using a different fault-tolerance method, so each logical drive can be affected differently. • RAID 0 configurations cannot tolerate drive failure. If any physical drive in the array fails, all non-fault-tolerant (RAID 0) logical drives in the same array will also fail. Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache User Guide D-1

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Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache User Guide
D-1
D
Hard Drive Installation and Replacement
Each SCSI channel on a Smart Array controller supports up to 14 drives. Drives can
be of the Wide Ultra3 SCSI or Wide Ultra2 SCSI type.
Each drive on a SCSI bus must have a unique ID value in the range 0 to 15 (except
ID 7, which is reserved for controller use). This value is set automatically on hot-
pluggable drives in Compaq
ProLiant
TM
servers and storage systems, but values for
other drives must be set manually.
•
Do
not
terminate the drives. Compaq servers and internal cabling provide the
required termination of the SCSI bus.
•
Do
not
use drives of different capacity in the same array. The excess capacity of
larger drives cannot be used by the array and is wasted.
•
Do
not
combine hot-pluggable drives with non-hot-pluggable drives on the same
SCSI bus.
Hard drives that are currently supported by the Smart Array Controller are listed at
www.compaq.com/products/storageworks/.
General Information About Hard Drive Failure
When a hard drive fails, all logical drives that are in the same array will be affected.
Each logical drive in an array may be using a different fault-tolerance method, so
each logical drive can be affected differently.
•
RAID 0 configurations cannot tolerate drive failure. If any physical drive in the
array fails, all non-fault-tolerant (RAID 0) logical drives in the same array will
also fail.