SAN Disk w/o Cluster


 
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Special Forums Hardware Filesystems, Disks and Memory SAN Disk w/o Cluster
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Old 07-13-2009
You CAN have both be able to have ACCESS to the drive. However, it is NOT true that one can be read+write and the other read only. The only way this is safe is if one system is NOT using (and if possible, seeing) the drive at the same time. Why? Because manipulations to the drive can happen from the system that has read+write including modifications to meta data areas... and if that information is not communicated somehow to the other host, then even if it's supposedly "read only", you'll be messing up the internal representation on that host and possible cause issues, perhaps major issues.
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hbaapi(3C)																hbaapi(3C)

NAME
hbaapi - Fibre Channel Storage Network Industry Association Host Bus Adapter Application Programming Interface (FC SNIA HBA API) DESCRIPTION
The Common HBA API provides a consistent HBA standard interface for accessing information in a Fibre Channel Storage Area Network (SAN) that would be implemented across vendors as a standard 'C' API supported by vendor specific library instances. This API library is thread-safe, but threads should not be cancelled when execution is in the API. The following functions are available in the API for managing a Fibre Channel HBA. This API would be exposed to upper level applications to control SAN functionality. Please refer to for details on structures used. 01. 02. 03. 04. 05. 06. 07. 08. 09. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. FCP Information Functions require that the applications calling them have an effective user id as that of the root user (euid = 0). 20. 21. 22. SCSI Information Functions require that the applications calling them have an effective user id as that of the root user (euid = 0). 23. 24. FILES
Contains the related data structures and definitions as in AUTHOR
These APIs were developed by Hewlett-Packard Company. SEE ALSO
HBA_GetVersion(3C), HBA_LoadLibrary(3C), HBA_FreeLibrary(3C), HBA_GetNumberOfAdapters(3C), HBA_GetAdapterName(3C), HBA_OpenAdapter(3C), HBA_CloseAdapter(3C), HBA_GetAdapterAttributes(3C), HBA_GetAdapterPortAttributes(3C), HBA_GetPortStatistics(3C), HBA_GetDiscoveredPortAt- tributes(3C), HBA_GetPortAttributesByWWN(3C), HBA_SendCTPassThru(3C), HBA_GetEventBuffer(3C), HBA_SetRNIDMgmtInfo(3C), HBA_GetRNIDMgmt- Info(3C), HBA_SendRNID(3C), HBA_GetFcpTargetMapping(3C), HBA_GetFcpPersistentBinding(3C), HBA_SendScsiInquiry(3C), HBA_SendReportLUNs(3C), HBA_SendReadCapacity(3C), HBA_RefreshInformation(3C), HBA_ResetStatistics(3C). hbaapi(3C)