Cybernetics miSAN-V6, Operator'S Manual

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55 Operating the Web Control Panel
Cybernetics UM-MV-86-B1-0801
You do not have to configure “Settings” > “Network” > “SNMP”, because the HSTC does
not send SNMP messages to the UPS; it only receives them.
To test the configuration, pull the AC power plug on the UPS. The “Messages” tab on the
Web Control Panel should give a message that the UPS is on battery power. Wait a few
seconds, then plug the UPS AC power back in. The “Messages” tab on the Web Control
Panel should give a message that power has been restored.
Data Compression
Rule: you can't compress encrypted data, but you can encrypt compressed data. If you
want to use data compression and encryption together, you must compress first and then
encrypt.
Most tape drives have the capability of compressing the data they receive during a
backup and decompressing the data they read from the tape during a restore. Tape
drives handle data compression transparently in hardware; the application software
doesn't have to do anything except tell the tape drive to enable it. Unfortunately, a tape
drive's internal compression is useless for encrypted PTs, since the tape drive receives
the data only after encryption (see the rule above). The HSTC always disables the tape
drive's internal compression when creating encrypted tapes.
The HSTC itself also has the capability of compressing data. The HSTC supports using
its own compression for both VTs and PTs. The HSTC's compression may be used with
encrypted or non-encrypted VTs and encrypted PTs, but not with non-encrypted (plain)
PTs. For non-encrypted PTs, the HSTC lets the tape drive compress the data instead.
There are two menu options that control when the HSTC uses its own compression:
*
Compress VTs
: Disabled/Enabled
* Compress encrypted VTs and PTs: Disabled/Enabled
Note
From the HSTC’s Web Control Panel, make sure “Receive SNMP
messages from UPS” is set to Enabled.