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3. Shell Programming and Scripting
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4. Shell Programming and Scripting
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5. Shell Programming and Scripting
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6. UNIX for Dummies Questions & Answers
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10. UNIX for Dummies Questions & Answers
Hello Friends ,
I have been reading some of the Sys Admin notes when i came across a term "Power Cycling"
Can anybody please explain what this means
Thank You (1 Reply)
Discussion started by: DPAI
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pm_trans_check(9F) Kernel Functions for Drivers pm_trans_check(9F)
NAME
pm_trans_check - Device power cycle advisory check
SYNOPSIS
#include <sys/sunddi.h>
int pm_trans_check(struct pm_trans_data *datap, time_t *intervalp);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI)
PARAMETERS
datap Pointer to a pm_trans_data structure
intervalp Pointer to time difference when next power cycle will be advised
DESCRIPTION
The pm_trans_check() function checks if a power-cycle is currently advised based on data in the pm_trans_data structure. This function is
provided to prevent damage to devices from excess power cycles; drivers for devices that are sensitive to the number of power cycles should
call pm_trans_check() from their power(9E) function before powering-off a device. If pm_trans_check() indicates that the device should not
be power cycled, the driver should not attempt to power cycle the device and should fail the call to power(9E) entry point.
If pm_trans_check() returns that it is not advised to power cycle the device, it attempts to calculate when the next power cycle is
advised, based on the supplied parameters. In such case, intervalp returns the time difference (in seconds) from the current time to when
the next power cycle is advised. If the time for the next power cycle cannot be determined, intervalp indicates 0.
To avoid excessive calls to the power(9E) entry point during a period when power cycling is not advised, the driver should mark the corre-
sponding device component busy for the intervalp time period (if interval is not 0). Conveniently, the driver can utilize the fact that
calls to pm_busy_component(9F) are stacked. If power cycling is not advised, the driver can call pm_busy_component(9F) and issue a time-
out(9F) for the intervalp time. The timeout() handler can issue the corresponding pm_idle_component(9F) call.
When the format field of pm_trans_data is set to DC_SCSI_FORMAT, the caller must provide valid data in svc_date[], lifemax, and ncycles.
Currently, flag must be set to 0.
struct pm_scsi_cycles {
int lifemax; /* lifetime max power cycles */
int ncycles; /* number of cycles so far */
char svc_date[DC_SCSI_MFR_LEN]; /* service date YYYYWW */
int flag; /* reserved for future */
};
struct pm_trans_data {
int format; /* data format */
union {
struct pm_scsi_cycles scsi_cycles;
} un;
};
RETURN VALUES
1 Power cycle is advised
0 Power cycle is not advised
-1 Error due to invalid argument.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Committed |
+-----------------------------+-----------------------------+
SEE ALSO
power.conf(4), attributes(5), power(9E)
Writing Device Drivers
Using Power Management
SunOS 5.11 16 Oct 1999 pm_trans_check(9F)