-a <attribute>, --attrib=<attribute> <devnum>*
Report the value of the specified attribute. If devnum is provided then attribute must be an attribute of the device. If devnum is not provided then attribute is considered a global attribute. For example, ’cddm --attrib=vendor 1’ will return the name of the device vendor of device 1. And, ’cddm --attrib=max_error_rate’ will report the global value for the maximum error rate health threshold applicable to all devices. See the --show option for sets of available attributes.
This option is used to check the proper connection of device cables and the working order of device lights. It will cause the identify light (red LED) of the devices to illuminate in a Johnson Counter fashion; starting with the first slot and progressing to the last slot in ˜1/2 second steps. After all lights are on then all lights will be turned off in the same order. This behavior will repeat until this option is turned off.
This option is used to remove the default output formatting performed by other options. Only options subsequent to this option on the command line are effected.
-I, --interrogate devnum
Creates a report of events for the specified device. The source of the report may come from a variety of sources that will be identified in the report.
-i [on|off], --identify[=on|off] devnum
Turns on or off the specified device’s identifying indicator. For identify, if on or off is not specified then this option will toggle the state. The identification is typically a slow blinking red light (˜1 seconds period) found at the front of the slot associated with the device. The identifying indicator will remain on until it is turned off or the device fails at which time the indicator will be lit solidly.
-R devnum, --remove devnum
Logically removes the specified device prior to the device being physically removed from the chassis. A logically removed device will be dismounted from the file system and either spun-down or placed on standby (HDD or SSD, respectively).
When the device has completed the logical remove process, a notification will be posted on the console indicating that the device can be pulled. A logically-removed device’s red identifying indicator will be displaying a fast blink (˜1/2 second period or faster).
It is always best to logically remove a device before pulling it from the chassis. A failed device does not need to be logically removed.
Note A logically removed device cannot be place back online until it has been removed from the chassis. All contents of a logically removed device will be deleted when it is reinserted into the chassis.
-s value, --show=<set,set,...> <devnum>*
This is used to show selected sets of global or device information. Note that sets that require a
devnum cannot be mixed with sets that do not require a devnum.
The collection of some device information has a negative impact on device performance, therefore, this impactive information is cached and automatically updated periodically usually when the device is idle.set selects one of the different categories of information defined as follows:
Show all available device information.
Show device type specific information. This will report various points of information specific to the device technology and is a function of vendor implementation.
Shows all error counters.
Shows information relative to a device’s health
Show physical information about the device; make, model, vendor, capacity, serial number, etc.
This suboption will cause some information sets to be reported in raw data format. For example, this option will cause the SATA S.M.A.R.T. attributes reported in the dev_spec set to be reported as it’s collected from the device as opposed to interpreting it.
Shows available Self-Monitoring, Analysis and Reporting Technology values. These values are technology specific (SCSI, ATA) and implementation is varied from vendor to vendor.
Show device state information only.
Show device statistical information
This suboption is not an information set, but instead, will force a refresh of the device information cache possibly momentarily impacting device performance.
Reports the version of cddm and CDD drivers information.
Reports the version of cddm.
This option is used to disable policy enforced by cddm. It is not recommended that this option be utilized except in extraneous cases. This option must precede other options on the command line for which policy is to violated.
-X, --unsuspend devnum
This option will unsuspend a not-yet-pulled suspended device. (See the suspend option.)
-x [minutes], --suspend[=minutes] devnum
The suspend option prepares a healthy device to be safely removed from the chassis and allowing it to be reinserted later without incurring data loss.
The CDE470 platform has two devices in each tray. When one device in a tray has failed the other device in the tray will need to be suspended before the tray is pulled from the chassis.
The volume on the suspended device is not dismounted from the file system but placed in a quiescent state. The file system will not attempt to access the volume during the suspend period. While
a device is suspended, necessary data residing on the device will be reconstructed from data on other devices.
A device cannot remain suspended indefinitely due to a potential performance impact to the system. The default amount of time that a device may remain suspended is 20 minutes. A suspended and removed device that is reinserted before the suspend period expires will automatically and immediately be placed online and its volume returned to full operation.
If the suspend period expires before the device is reinsterted then the device will be considered lost and its volume will be abandoned by the file system. A suspended device reinserted after the suspend period expires will be considered a new device and its current contents will be discarded. If, by happenstance, a suspended and removed device is replaced with another device then the suspended volume will be discarded by the file system and the replacement device will be considered new and its current contents discarded.
If a suspended device is not pulled from the chassis then it will return to online and normal operation when the suspend period expires. A suspended but not yet removed device can be unsuspended with the unsuspend option.
The minutes parameter may be provided to override the default suspend period. The suspend option with the minute parameter may be used on a device already suspended to modify the cur- rent suspend period.
Note In order to preserve data resilience, cddm will enforce a policy of only one device suspended at a time. This option is valid for the CDE470 platform only.