Hitachi Compute Blade 500 Series User Manual page 81

manager during its startup procedure. This TCP port can be changed on
the System Configuration screen, but we recommend that the initial value
determined by the LPAR manager be used.
Notes for Virtual COM Console
Notes on Telnet or SSH Connection
• You can change a port number to specify when connecting to a guest
screen through Telnet or SSH, which needs to be different from a port
number for LPAR manager. See
D-2 for details. Some port numbers may not be available depending on
the OS settings, account privilege, installation software, or network
environment. Check which port is available on the terminal and in the
network environment before changing the port number. When there is no
problem for use, it is recommended that you use a default port number
among serial numbers starting from 20801, which have been thoroughly
verified.
• Only one terminal per LPAR is permitted to operate guest screens from
the virtual COM console. If a connection to two or more terminals is
attempted, the connection to the second or more terminals is disabled.
• If the guest screen cannot be displayed while connecting to the virtual
COM console, check the serial console configuration.
Notes on Guest Screen Operation
• Although the virtual COM console can operate multiple LPARs
concurrently, the performance of consoles of other LPARs may decrease
with an increase in output data.
• If a large amount of characters are pasted to a guest screen, a part of
characters may not be pasted. 256 or more characters per line for the
Windows command prompt, and 1024 or more characters per line for
Linux prompt cannot be pasted. In addition, if 1024 or more characters
are pasted for the Linux prompt, Linux may hang up or unexpected
screen operation may occur. The number of characters that can be pasted
stably without being lost is less than 256 per line for the Windows
command prompt, less than 1024 per line for the Linux prompt, and less
than 10000 per line for editing programs including the Vi editor. When
pasting characters, it is recommended that a large amount of characters
be divided into several blocks (up to the upper limit of characters per
block), and then be pasted.
When you connect the system to the virtual COM console and boot the
guest OS, Windows may halt its boot with the EFI screen; Linux may halt
its boot in the grub console; even though rarely. If it happens, press the
[Enter] key to resume the boot.
Notes on Operation
• Connect to the virtual COM console when needed in usual operation.
Virtual COM console response might stop when it stays connected to LPAR
manager. Reconnect the virtual COM console then. We recommend that
Hitachi Compute Blade 500 Series Logical partitioning manager User's Guide
LPAR manager use Port numbers on page
System Operation
2-9