HP Command View EVA Software User Manual
Page 45
Fibre Channel switches typically offer two types of frame routing between N_Ports:
•
Source ID/Destination ID (SID/DID) routing, which transfers all exchanges through the fabric
using the same path
•
Exchange-based routing, which transfers all frames within an exchange using the same path,
but other exchanges may use alternate paths
NOTE:
B-class switches refer to SID/DID protocol as in-order delivery routing. C-class switches
refer to SID/DID protocol as flow-based load balancing . Both switch classes use exchange-based
routing terminology. See the individual switch user guides for configuration details.
The current HP FC Data Replication Protocol (HP-FC) uses multiple exchanges for each data
replication transfer. One or more exchanges are used to transfer data and an additional exchange
is used for command information. The HP-FC Protocol requires all frames within the transfer to be
delivered in order. Therefore, if HP-FC Protocol is used in the fabric, the fabric must use SID/DID
routing.
HP SCSI FC-Compliant Data Replication Protocol (HP SCSI-FC) was developed to take advantage
of the exchange-based routing protocol available in fabric switches. HP SCSI-FC and HP-FC
protocols are available on controller software versions later than 0952xxxx; earlier versions support
only the FC-HP Protocol.
The three options listed in
are as follows:
•
HP FC Data Replication Protocol. This protocol requires all transfers to be completed in order,
which is accomplished by the proper configuration of the SAN fabric switches for SID/DID.
See the HP P6000 Continuous Access Implementation Guide for specific settings and the
appropriate switch user guides for detailed instructions.
A storage system configured for this protocol successfully creates a DR group only with a
storage system capable of HP-FC, which is the default protocol for controller software versions
0952xxxx and earlier, and is user-selectable in later versions. Fabric misconfiguration with
this protocol selection results in significant performance degradation and possible data integrity
issues on the destination storage system.
•
HP SCSI FCP Compliant Data Replication Protocol. This protocol supports the transfer of EVA
data replication traffic in a fabric configured for exchange-based or SID/DID routing. The
protocol can take advantage of the exchange-based fabric setting, but is not dependent on
the fabric setting. For the proper configuration of the SAN fabric switches for Exchange, see
the HP P6000 Continuous Access Implementation Guide; for specific settings, see the
appropriate switch user guides for detailed instructions.
•
Either. This selection should be used when the SAN contains storage systems running both
HP-FC and HP SCSI-FC protocols. The Either selection allows storage systems only capable of
HP-FC to successfully create DR groups with the storage systems running controller software
version later than 0952xxxx. This facilitates the migration of data from older to newer storage
systems. The HP-FC protocol is dependent on the fabric configuration being set for SID/DID
routing. The same fabric considerations noted in the HP-FC option apply to the Either selection
as well.
HP P6000 Continuous Access software
45