Chapter 2 - Operating Mode and Topologies
Clustered Connection - Dual Hosts
19
Clustered Connection - Dual Hosts
This topology supports standard current SCSI clustering infra-structure. Each host
employs a single ported SCSI HBA. Each SCSI bus is isolated and the LUNs are
viewable on both SCSI ports. In this configuration you will have two independent
Ultra320 paths to the storage.
Expansion Connection
This topology supports standard single or dual ported direct attached access to the
storage in which additional enclosures are daisy-chained to to the primary
enclosure. The host employs a dual ported SCSI HBA or two single port SCSI
HBAs. In this configuration you will have two Ultra320 paths to the storage.
LUN Mapping
The SCSI-SATA RAID Controller has extensive support for LUN assignment and
SAN LUN Mapping. A logical drive can be mapped to a particular host HBA port.
Up to 512 mappings or assignments can be created, with a 2 TB per logical drive
limitation. Online logical drive addition and deletion is supported, in any order.
SAN LUN Mapping allows multiple hosts and operating systems exclusive access
to certain areas of the storage without requiring host software for management.
Additionally, an internal logical drive can be presented to a host system as a
different LUN number, simplifying multiple systems setup.
Alternate Path Software
This is a software tool that manages multiple paths between the host operating
system and logical drives. The software manages the multiple paths by detecting
duplicate disk objects that represent a single logical drive. It then designates one
disk object as the primary disk object with a primary path, while the other is
designated the secondary disk object with an alternate path. If the primary path
becomes inaccessible, the software redirects the data to the secondary disk object
through the alternate path, preserving the access to the logical drive.
4700S.book Page 19 Wednesday, April 6, 2005 2:14 PM
Содержание NexStor 4700S Series
Страница 2: ...4700S book Page 2 Wednesday April 6 2005 2 14 PM...
Страница 8: ...Table of Contents iv 4700S book Page iv Wednesday April 6 2005 2 14 PM...
Страница 74: ...Chapter 5 Troubleshooting Host SCSI Channel Problems 62 4700S book Page 62 Wednesday April 6 2005 2 14 PM...
Страница 90: ...Chapter 6 Maintenance Replacing the Enclosure 78 4700S book Page 78 Wednesday April 6 2005 2 14 PM...
Страница 94: ...Appendix A Technical Information Specifications 82 4700S book Page 82 Wednesday April 6 2005 2 14 PM...
Страница 108: ...Index 96 4700S book Page 96 Wednesday April 6 2005 2 14 PM...
Страница 109: ...4700S book Page 97 Wednesday April 6 2005 2 14 PM...