Quantum TC2201E, User Manual

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Chapter 2 Getting Started
Advanced Configuration Options
30 Quantum TC2201E User’s Guide
Automated Device Discovery
2
iSNS servers maintain information about iSCSI clients and will respond
to iSNS protocol queries and requests, and initiate iSNS protocol State
Change Notifications. To use iSNS with the TC2201E, simply enable the
TC2201E as a client and then enter a DNS name or IP address for up to
three iSNS servers.
The default setting is Disabled. When enabled, the TC2201E will function
as an iSNS client and will initiate transactions with iSNS servers using the
iSNSP. The iSNS client is a process that is co-resident in the TC2201E, and
which can register device attribute information with the iSNS server. The
capability is used for automated device discovery.
SCSI
Configuration
2
For SCSI devices, the TC2201E provides a number of optional
configuration settings that can be used to enhance operation and security.
Buffered Tape Writes
2
Buffered Tape Writes is an option designed to enhance system
performance. By returning status on consecutive write commands prior
to the tape device receiving data, Buffered Tape Writes remove the
latency of waiting for responses from the tape device. In the event that
data does not transfer correctly for any reason, the router will return a
check condition on a subsequent command.
Commands other than Write(6) are not issued until status is received for
any pending write. Also, status is not returned until the device completes
the command. For instance, when a synchronizing command is sent to a
drive, such as sending a Write File mark, a good status means all prior
commands have been successfully completed and data has been
successfully written to the medium. This is appropriate for such tasks as
file backup/restore.
Note:
By default, the Buffered Tape Writes option is disabled. If the
application requires confirmation of individual blocks being
written to the medium, such as audit trail tapes or log tapes,
this option should be disabled.