DataDirect Networks EF2800, Руководство пользователя

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S e t t i n g U p t h e E F 2 8 0 0
DataDirect Networks EF2800 FC RAID Storage System User Guide (V 1.0)
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4.3 Restarting the SMs
You have several options when you need to shut down or restart an SM:
• Restart one or both SMs: Gracefully shuts down and restarts the
selected SM module. This restarts both the storage manager and
the LAN Subsystem on the SM module and ensures that any data in
the SM’s write-back cache is written to disk. Use this option when
you have changed a configuration that requires restarting (SAM
messages say when you need to do this) or when you want to
restart an EF2800 that does not seem to be working properly (see
page 62 ).
• Shut down one or both SMs: The shutdown function gracefully
shuts down one or both SM modules. This shuts down both the
storage controller and LAN Subsystem on the selected SM module
and ensures that any data in the SM module’s write-back cache is
written to disk. Use this option when you plan to power down the
whole EF2800 (see
page 63 ).
• Put the SM offline: Gracefully takes the SM module offline, which
halts I/0 and makes sure that any data in the write-back cache is
written to disk. Use this option when you need to replace an SM
module (see
page 64 ).
• Put the SM online: Puts the selected SM module online. Use this
option when an SM module is offline. This does not restart the LAN
Subsystem (see
page 64 ).
• Kill the SM: Forces the SM offline when using the “Put SM Offline”
option does not work and you need to remove the module. This
does not write the write-back cache to disk, but relies on the
mirrored cache in the other SM module to write the data to disk.
Using this option will cause users to lose access to data if the other
SM module is not online (see
page 65 ).
• Restart the LAN Subsystem: Restarts the LAN Subsystem if you are
having difficulty communicating with the SM module using SAM
(see
page 66 ).