2-84 Sun StorEdge 5310 NAS Troubleshooting Guide • December 2004
This means that the email could not be sent. It is always accompanied by a more
specific error.
Error in tcp_open for servername
This means that StorEdge could not open a TCP connection to the configured mail
server. Possible reasons are name resolution, incorrect IP, IP unreachable due to
network problem. To correct this issue, enter the mail server by IP address, and
make sure the IP address is correct and reachable. The ping command from the
StorEdge CLI may be helpful in this case, both by name and IP address.
Unknown code <501 Syntax error, parameters in command "MAIL
From: <servername@>" unrecognized or missing.
The key here is the “from” address ending in the “@” character. The SMTP server
usually refuses email from StorEdge unless a DNS domain is configured, dependent
on mail server configuration. This is true whether you are using DNS or not.
Unknown code <501 This MTA is configured NOT to relay message
from [servername] to [domain.com].
This message indicates that the mail server is configured not to relay messages from
other SMTP senders (i.e. StorEdge) to outside domains. The solution to this is to
remove all email addresses not in the local DNS domain. The email messages may
then be forwarded as needed.
2.19 Hardware Warning Messages
Hardware replacement procedures can be located in Chapter 8, “FRU Replacement
Procedures” in this book.

Log message: Controller write-back cache is disabled.

Log message: System on battery backup.

The power source has become unstable, and StorEdge now writes data to disk before
confirming writes to clients, in case of complete power loss.
Specifically, this is an indication the RAID cache has been disabled. This message is
caused by either an AC power failure or a discharged UPS. If there is an obvious
indication of AC power loss that could last for some time, client systems should be
disconnected and shut down.
If AC power has failed, the condition corrects itself after AC power is restored.