Hitachi Compute Blade 500 Series User Manual page 109

3. An active server blade with (a) running is switched to a standby
server blade with BIOS time as UTC, or the former active server blade
is switched back. Or an active server blade with (b) running is
switched to a standby server blade with BIOS time as local time, or
the former active server blade is switched back.
Solutions
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Configure BIOS time setting using the following measures on the BIOS
setup screen for standby server blades, or on the OS or virtual
platform for server blades other than standby ones, and then reflect
the setting value to BIOS time.
When powering on the standby server blade for checking or setting
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BIOS time, disable N+M cold standby. Then, enable N+M cold standby
after checking or setting BIOS time. If you power on the standby
server blade with N+M cold standby enabled, the state will turn to
warning.
• If all the OS and virtual platforms in the same N+M standby group can be
(2)-(a), BIOS time as local time,
[When configuring the system]
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Set your local time to all server blades including a standby server
blade in N+M standby group.
[When changing server blades]
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Check the local time is shown for BIOS time of the server blade before
OS startup.
• If all the OS and virtual platforms in the same N+M standby group can be
(2)-(b), UTC time as local time,
[When configuring the system]
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Set UTC to all server blades including a standby server blade in the
same N+M standby group.
[When changing server blades]
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Check UTC is shown for BIOS time of the server blade before OS
startup.
• If all the OS and virtual platforms in the same N+M cold standby group
cannot have the same BIOS time: If Windows with Hyper-V or LPAR
manager is mixed with VMware ESX 4.0 or later
[When configuring the system]
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When VMware ESX 4.0 or later is in the N+M cold standby group,
enable NTP time synchronization for it to obtain time from NTP
servers. It is recommended that two or more NTP servers be set in
case that time synchronization may fail due to NTP server failure.
If dividing (2)-(a) and (2)-(b) mentioned above into the different N+M
cold standby groups respectively, you can do without configuring NTP
servers.
When Red Hat Enterprise Linux or VMware ESX 3.5 is in the N+M cold
standby group, set your local time to BIOS time. Set the local time to
BIOS time for the standby server blade.
[When operating the system]
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Hitachi Compute Blade 500 Series Logical partitioning manager User's Guide
High Reliability Functions
3-9