IBM System Storage TS3310, Информация по обслуживанию

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Multi-Path Architecture
Storage Area Network (SAN)-ready Multi-Path Architecture allows homogeneous
or heterogeneous open systems applications to share the library's robotics without
middleware or a dedicated server (host) acting as a library manager. The
Multi-Path Architecture is compliant with the following attachment interfaces:
v
Ultra160 SCSI
v Fibre Channel
v SAS (Serial Attached SCSI)
The library is certified for SAN solutions (such as LAN-free backup). LAN-free
drive sharing is not available on SAS drives.
Multi-Path Architecture allows additional control paths and data paths to be
configured for any one logical library.
Using Multiple Control Paths
The lowest physical drive in a logical library is automatically set as the control
path drive for that logical library. Each drive in a logical library can be a control
path drive.
Command failures and time-outs are costly. Customers want their libraries to run
smoothly and efficiently. To ensure continued processing, the library offers an
optional control path failover feature that enables the host device driver to send
the same command to an alternate control path. With control path failover
installed, the alternate control path can include another HBA, SAN, or library
control path drive. The device driver initiates error recovery and continues the
operation on the alternate control path without interrupting the application. AIX,
HP-UX, Linux, Solaris, and Windows hosts are currently supported for this feature.
The control path failover feature is activated by entering a license key into the
library. To order the feature, call an IBM Sales Representative.
For more information on control paths, refer to the Setup and Operator Guide for this
library.
Using Multiple Data Paths for Data Path Failover
The Path Failover feature (Feature Code 1682) includes the Control Path Failover
function and the Data Path Failover function.
Data Path Failover and Load Balancing functions exclusively support native Fibre
Channel Tape Drives in the library using the IBM device driver. Data Path Failover
is designed to provide a failover mechanism in the IBM device driver for AIX,
Linux, Solaris, and Windows, which enable multiple redundant paths to be
configured in a SAN environment. In the event of a path or component failure, the
failover mechanism is designed to automatically provide error recovery to retry the
current operation using an alternate, pre-configured path without aborting the
current job in progress. This allows flexibility in SAN configuration, availability,
and management.
When accessing a tape drive device that has been configured with alternate paths
across multiple host ports, the IBM device driver for AIX, Linux, and Solaris
automatically selects a path through the host bus adapter (HBA) that has the
Chapter 2. Product Description
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