HP StorageWorks Continuous Access EVA Administrator Guide (T3687-96043, December 2005)

• Failsafe enabled–If any virtual disk within the DR group fails or becomes unreachable, host I/O
and remote replication automatically stop for all DR group mem b ers. This preserves the order of
the replicated data. A failsafe-enabled DR group ca n be in one of two states:
• Locked (failsafe-locked)–Host I/O and remote replication automa tically stop.
• Unlocked (failsafe-unlocked)–Host I/O and remote replication occur.
• Failsafe disabled–If any destination virtual disk (remote copy) within the D R group fails or
becomes unreachable, all host writes to the source DR group continue, but all remote replication
to the d estination DR group automatically stops; the source DR group logs its host writes to the
DR group log until remote replication is re-established. I f a source virtual disk fails, host writes
to the failed disk stop, as well as remote replication to its remote copy; host writes and remote
replication to the other members of the DR group continue normally.
Interface o
ptions
Performing
replication can involve one or more of the inter faces and products described in Table 2.
Table 2 Rep
lication products and inter faces
HP product
Interface
Remarks
HP StorageWorks
Command View EVA
Browser–based
graphical user interface
(GUI)
• Required
• Array man
agement software that creates snapshots,
snapclo
nes, and DR groups using a GUI
• Replica
tes by specifying an array and virtual disk,
not by a h
ost and host volume
• Cannot
perform dynamic mounting or interact with
hosts
• Does no
t provide jobs, job templates, or scripting
• See HP
Command View EVA for more information
HP StorageWorks
Replication Solutions
Manager
Browser-based GUI
and command line user
interface (CLUI)
• Optional
• A specialized replication interface that creates
snapshots, snapclones, and DR groups using a GUI,
jobs, and a CLUI
• Replicates by specifying an array and virtual disk
(LUN), a host and host volume, or a n application
database
• Performs dynamic mounting a nd interacts with hosts
• Provides integrated job editor, job templates and
job scripting
• Includes integrated job management
HP StorageWorks
Storag e System Scripting
Utility (SSSU)
Host command line
• Optional
• EVA host platform software that creates snapshots,
snapclones, and DR groups using a command line
or custom script
• Replicates by specifying an array a nd virtual disk,
notbyahostandhostvolume
• Performs dynamic mounting and host interaction
through custom scripts
HP StorageWorks SMI–S
Interface for Command
View EVA
WEBM client–server
using XML
• Optional
• Provides an SMI–S compliant interface for HP
StorageWorks Command View EVA
HP Command View EVA tasks
HP Command View EVA is a user interface that communicates with the EVA controllers to control and
monitor the storage. HP Command View EVA maintains a database for each managed array and the
HP StorageWorks Continuous Access EVA administrator guide
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