Silicon Graphics InfiniteStorage 6120, User Manual

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Configuration Management
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3.2.6 Cache Coherency
By default, the InfiniteStorage 6120 runs in couplet mode, where both controllers are running
simultaneously, communicating through internal Ethernet connections. This means that the
InfiniteStorage 6120 is always running with cache coherency enabled.
The write back cache settings are configurable for each storage pool. To display the current settings,
enter command
SHOW POOL <id> ALL_ATTRIBUTES (Figure 67)
.
To change the settings, use these commands:
SET POOL <id> MIRRORED_WRITE_BACK_CACHE=[TRUE|FALSE]
SET POOL <id> WRITE_BACK_CACHING=[TRUE|FALSE]
3.2.7 Setting the System’s Date and Time
SHOW SUBSYSTEM ALL_ATTRIBUTES displays the current system date and time
(Figure 68)
.
The system time and date for the InfiniteStorage 6120 are factory-configured for the U.S. Pacific
Standard Time (PST) zone.
The system records time using the military method, which records hours from 00 to 24, not in a.m.
and p.m. increments of 1 to 12.Valid date settings are between years 2000 and 2104. Settings are
automatically adjusted for leap years.
To change the system date and time to March 1, 2009 2:15:32 pm, for example, type:
SET SUBSYSTEM DATE_AND_TIME=2009:3:1:14:15:32
Mirrored Write Back Cache performance is limited by the speed of the internal
Ethernet as cache data is transmitted over this connection.
Warning
!
Figure 67. Show Write Back Cache Setting
RAID$ show pool 3 all
OID: 0x19b003
Type: STORAGE
Name: RAID5set
Chunk Size: 64KB (0x80 blocks)
SATAssure: FALSE
IO ROUTING: TRUE
WBC: TRUE
MWBC: FALSE
Initializing: FALSE
Rebuilding: TRUE
Paused: FALSE
....
....
WBC=Write Back Caching
MWBC=Mirrored Write Back Caching
Figure 68. Show System Time
RAID$ show subsystem all_attributes
RP Subsystem Name:
UID: 0x0000000000000000
Subsystem Time: Fri Jan 30 16:48:55 2009
Time zone: 0 minutes
DST offset: 0 minutes
Locate Dwell Time: 120 seconds
Mirror Synch: NA