Redundant Electronics Configuration Examples; What Occurs During A Failover - Oracle StorageTek SL3000 User Manual

Redundant Electronics Configuration Examples

Hardware activation file (see
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HLI host with TCP/IP or FC-SCSI host using ACSLS (see
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Management Software for RE"
native FC-SCSI interface.

Redundant Electronics Configuration Examples

Each library controller card requires its own unique IP address. If the dual TCP/IP
feature is active on the library, each card requires two unique IP addresses: one for the
primary port 2B and one for the secondary port 2A. Therefore, a library with RE and
dual TCP/IP requires four unique IP addresses.
On each controller card, port 2B and 2A must be on different broadcast domains.
However, port 2B on the active card and port 2B on the standby card can be on the
same broadcast domain. The same is true for the 2A ports.
Figure B–1 Redundant Electronics Configuration Examples
For more information about dual TCP/IP, see

What Occurs During a Failover

In a failover, the active library controller attempts to complete all in-process jobs and
copies the cartridge database to the standby controller card. If the database cannot be
copied (usually only in a sudden failure), you must perform an audit after failover (see
"Auditing the Library"
their home slots. The library places any cartridges it cannot return to a home slot in a
system slot for host recovery (see the host software documentation).
After all in-process jobs complete or time out, the cards switch roles. The standby
controller becomes active and the previously active controller becomes the standby. If
the previously active controller cannot bring up the standby software, the controller
enters a fault state.
Effect of a Failover on Users
Users of tape management software (Symantec or Virtual Storage Manager) do not
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see an interruption.
HLI host applications queue requests during the failover process for completion
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after the failover switch. For ACSLS, only mount and dismount requests are
affected (see the host software documentation).
B-2 StorageTek SL3000 User's Guide
"Activating Optional Features"
on page 6-4). RE is not available to hosts using a
"Dual TCP/IP Overview"
on page 11-1). The library returns any in-transit cartridges to
on page 3-1)
"Updating HLI Host
on page C-1.