Adaptec Snap Server 700i Series, User Manual

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Backing Up Your Data with Mirrored Volumes
70 Snap Server 700i Series User’s Guide
A dedicated link between the volume and its mirror is required, to support the
continual synchronization.
Mirror Managers and Mirror Plexes
The original volume is called the mirror manager ; its mirror is called the mirror plex .
The mirror plex must have a name that’s unique across both iSCSI Storage
Appliances. Data is written to the mirror manager first; then, the mirror plex is
synchronized with the mirror manager.
If required, you can change the priority of the mirror plex so that it becomes the
mirror manager, and vice versa. See “Changing Mirror Priorities” on page 72 for
instructions.
Once a mirrored volume is created, you can use Adaptec Storage Manager to
manage it. This section describes how to:
• Create a mirrored volume (see page 71).
• Extend a mirrored volume (see page 72).
• Change mirror priorities (see page 72).
• Force a failover on a mirrored volume (see page 73).
• Fail back a mirrored volume (see page 73).
• Break a mirrored volume (see page 74).
• Delete a mirrored volume (see page 75).
iSCSI iSCSI
Appliance A
File Server
Net 1 Net 1
Net 2
Appliance B
Volume XYZ
(original volume)
Mirror Manager
Volume XYZ-1
(mirror of volume)
Mirror Plex
Synchronization
(Mirror IO)
Stand-by access
to volume
Active access to
volume