Quantum SNC 4000, Руководство пользователя

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SNC 4000 User’s Guide 25
Before users can obtain remote access to the SNC, there are several configuration steps that must be
performed.
Create User Accounts for Telnet Access
Telnet user accounts are separate from those created in the AMC. Each SNC maintains its own list of user
accounts and passwords. To create a user, establish a serial connection to the SNC and enter the following
command:
addUser "xxxx","yyyy"
where
xxxx
is the user name and
yyyy
is the password.
Create additional users as necessary.
Unlock the Shell
The SNC uses a command called
shellLock
to prevent Telnet access to the SNC. This command is used
to guarantee that an administrator can always access the SNC through the serial port and perform
diagnostic/troubleshooting tasks.
shellLock
was implemented because VxWorks (the underlying OS of
the SNC and most SAN devices) only allows one command line session at time. Allowing only a single
diagnostic connection (telnet or serial) is beneficial because it prevents administrators from making
simultaneous changes which might destabilize the device. Since only one user can access the command
line at a time, it is possible for a Telnet user to open a session and lock out all other administrators. The only
way to clear this lock is through a reboot of the SNC.
To prevent a Telnet user from locking the command line shell, make a command line connection to the SNC
and enter:
shellLock 1
To unlock the shell enter:
shellLock 0
Using Telnet
When opening a Telnet connection to the SNC, the following must be true:
• A valid user account and password must exist
•
shellLock
is set to 0
• No other administrator is accessing the SNC through Telnet
To open a session to the SNC, start telnet and enter
open x.x.x.x
where
x.x.x.x
is the IP address of
the SNC. Alternatively you could just type
telnet x.x.x.x
.
Once a session is opened the connection will remain locked until the telnet session is closed or the SNC is
rebooted.
CAUTION
Modifications made to the SNC while using Telnet are permanent.
There is no Cancel key to back out of changes.
Note
Even when the shell is locked, the ADIC Management Console will be able to
manage the SNC.