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324 DS6000 Series: Concepts and Architecture
information and manage LUNs. See the IBM TotalStorage DS Open Application Programming
Interface Reference
, GC35-0493, for information on how to install and configure VDS
support.
The following sections present examples of VDS integration with advanced functions of the
DS6000 storage systems that became possible with the implementation of the DS CIM agent.
Geographically Dispersed Sites
Geographically Dispersed Sites (GDS) for MSCS is designed to provide high availability and a
disaster recovery solution for clustered Microsoft Server environments. It integrates Microsoft
Cluster Service (MSCS) and the Metro Mirror (PPRC) feature of the DS6000. It is designed to
allow Microsoft Cluster installations to span geographically dispersed sites and help protect
clients from site disasters or storage system failures. This solution is offered through IBM
storage services.
For more details about GDS refer to:
http://www.ibm.com/servers/storage/solutions/business_continuity/pdf/IBM_TotalStorage_GDS_W
hitepaper.pdf
Volume Shadow Copy Service
The Volume Shadow Copy Service provides a mechanism for creating consistent
point-in-time copies of data, known as shadow copies. It integrates IBM TotalStorage
FlashCopy to produce consistent shadow copies, while also coordinating with business
applications, file-system services, backup applications and fast-recovery solutions.
For more information refer to:
http://www.microsoft.com/resources/documentation/WindowsServ/2003/all/techref/en-us/w2k3tr_
vss_how.asp
HP OpenVMS
DS6000 supports FC attachment of OpenVMS Alpha systems with operating system
Version 7.3 or newer. For details regarding operating system versions and HBA types, see
the
DS6000 Interoperability Matrix, available at:
http://www.ibm.com/servers/storage/disk/ds6000/interop.html
The support includes clustering and multiple paths (exploiting the OpenVMS built-in
multipathing). Boot support is available via Request for Price Quotations (RPQ). The DS API
and the DS CLI are currently not available for OpenVMS.
FC port configuration
The OpenVMS FC driver has some limitations in handling FC error recovery. The operating
system may react to some situations with MountVerify conditions which are not recoverable.
Affected processes may hang and eventually stop.
Instead of writing a special OpenVMS driver, it has been decided to handle this in the
DS6000 host adapter microcode. As a result, DS6000 FC ports cannot be shared between
OpenVMS and non-OpenVMS hosts.