SurfRAID TRITON 16Ni, Руководство пользователя, Страница: 123 / 248

[Setting]
♦ Port to Bind - A TCP port to bind locally and is used to connect to the remote node. Default is
7788.
NOTE: User cannot use ports that already have been used. Available ports are
from 7788 to 77xx.
♦
Connection Type: proNAS OS supports two types of data replication protocols:
o
Sync - Synchronous. The system will acknowledge the transaction as completed after the
data is written to the disk of destination proNAS. It is recommended to use this mode. In most
cases, this connection type preserves transaction semantics. Write IO is reported as
completed if it has reached the remote disk.
o
Async (for high latency network) - Asynchronous. The system will acknowledge the
transaction as completed after the data is written to buffer. It provides faster transmission and
is suitable for busy network. Write IO is reported as completed if it has reached the local TCP
send buffer.
♦
Max Sync Rate – This sets the limit of the bandwidth that will be used by the synchronization
process. Default is 30MB/sec. Minimum value is 4MB/sec and maximum value is 680 MB/sec –
for high latency network environment (e.g. bonding on Gigabit Ethernet).
♦
Send buffer size (K) - It is the size of the TCP socket send buffer. You can specify smaller or
larger values. Larger values are appropriate for reasonable write throughput with asynchronous
protocol over high latency networks. Default is 512K and maximum is 1024K.
♦
Time out (sec) - It is the value to wait for connection timeout if the remote node is degraded. If
the remote node fails to send the response packet within the specified timeout time, the remote
node will be considered dead and the TCP/IP connection is abandoned. The default is 6 sec.
Minimum is 1 sec and maximum is 60 sec.
♦
When Lost Connection : When the replication connection is lost, the replication program can
either go stand-alone or will try to reconnect.
o
Reconnect: The replication program will attempt to reconnect. (Default)
o
Stand-alone: The replication program will not attempt to reconnect and will go on stand-alone
state. All IO request are only passed locally and no replication.
NOTE: Before replication will be successfully created, a 4GB logical volume will
be created on each node. This will serve as the metadata device for the
replicated volume. This volume is not mounted and will not be seen in the SR-
TRITON16Ni proNAS Manager GUI. Please be sure to have an extra 4GB space
on both of your SR-TRITON16Ni proNAS nodes.