3Ware 9650SE-2LPB-10 CLI Guide - Page 77

protect, perform, balance, quiet, protection than protect mode

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Page 77 highlights

Unit Object Commands protect provides the maximum data protection among the controller settings. When storsave is set to protect mode, it means: • When the unit becomes degraded, the write cache will be disabled. • Write journaling is enabled. All data flushing from controller cache will be flushed to media. • Incoming FUA (Force Unit Access) host requests will be honored unless a BBU is installed and enabled, in which case, they will be ignored. perform provides the maximum performance and least data protection of the three controller settings. When storsave is set to perform mode, it means: • When the unit becomes degraded, the write cache will not be disabled. • Write journaling is disabled. All data flushing from controller cache will be flushed to disk. If a BBU is present, this essentially disables the BBU for this unit. • Incoming FUA (Force Unit Access) host requests will be honored. If you set the storsave policy to perform, a confirmation message will warn you that there could be data loss in the event of a power failure. balance provides more data protection than perform mode but less data protection than protect mode, and provides better performance than protect mode but less performance than perform mode. When storsave is set to the balance mode, it means: • When the unit becomes degraded, the write cache will not be disabled. • Write journaling is disabled, if no BBU is present, and is enabled, if a BBU is present. All data flushing from controller cache will be flushed to media if a BBU is installed and enabled. Otherwise, data will be flushed to disk only. • Incoming FUA (Force Unit Access) host requests will be honored unless a BBU is installed and enabled, in which case, they will be ignored. quiet is used for non-interactive mode. No confirmation is given and the command is executed immediately. This is useful for scripting purposes. For additional information, see "Setting the StorSave Profile for a Unit" in the 3ware Serial ATA RAID Controller User Guide. Example: //localhost> /c0/u5 set storsave=protect Setting Command Storsave Policy for unit /c0/u5 to [protect] ... Done. www.3ware.com 71

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Unit Object Commands
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71
protect
provides the maximum data protection among the controller settings.
When storsave is set to
protect
mode, it means:
•
When the unit becomes degraded, the write cache will be disabled.
•
Write journaling is enabled. All data flushing from controller cache will
be flushed to media.
•
Incoming FUA (Force Unit Access) host requests will be honored unless
a BBU is installed and enabled, in which case, they will be ignored.
perform
provides the maximum performance and least data protection of the
three controller settings. When storsave is set to
perform
mode, it means:
•
When the unit becomes degraded, the write cache will not be disabled.
•
Write journaling is disabled. All data flushing from controller cache will
be flushed to disk. If a BBU is present, this essentially disables the BBU
for this unit.
•
Incoming FUA (Force Unit Access) host requests will be honored.
If you set the storsave policy to
perform
, a confirmation message will warn
you that there could be data loss in the event of a power failure.
balance
provides more data protection than perform mode but less data
protection than protect mode, and provides better performance than protect
mode but less performance than perform mode. When storsave is set to the
balance
mode, it means:
•
When the unit becomes degraded, the write cache will not be disabled.
•
Write journaling is disabled, if no BBU is present, and is enabled, if a
BBU is present. All data flushing from controller cache will be flushed to
media if a BBU is installed and enabled. Otherwise, data will be flushed
to disk only.
•
Incoming FUA (Force Unit Access) host requests will be honored unless
a BBU is installed and enabled, in which case, they will be ignored.
quiet
is used for non-interactive mode. No confirmation is given and the
command is executed immediately. This is useful for scripting purposes.
For additional information, see “Setting the StorSave Profile for a Unit” in the
3ware Serial ATA RAID Controller User Guide
.
Example:
//localhost> /c0/u5 set storsave=protect
Setting Command Storsave Policy for unit /c0/u5 to [protect] ...
Done.