HP IO Accelerator for BladeSystem c-Class - Manual (Page 51)

Utilities 51
Option Description
-p Purge instead of Clear: Performs a write followed by an erase. Purging the device might take
several hours to complete, depending on the size of the device.
-y No confirmation: Does not require a yes/no response to execute the utility.
-q Quiet: Do not display the status bar.
Clear support
A Clear is the default state of running fio-sure-erase (with no options), and is the act of performing full
low-level erase (every cell pushed to 1) of the entire NAND media, including retired erase blocks.
Metadata that is required for operation will not be destroyed (media event log, erase counts, physical bytes
read/written, performance and thermal history), but any user-specific metadata will be destroyed.
A Clear operation performs the following:
1. Creates a unity map of every addressable block (this allows fio-sure-erase to address every block,
including previously unmapped bad blocks).
2. Performs an erase cycle for each block (every cell is pushed to 1).
3. Restores the bad block map.
4. Formats the device to make the device usable again. The utility erases all of the headers during the
clear.
Purge support
A Purge operation is implemented by using the -p option with fio-sure-erase. Purge is the act of first
overwriting the entire NAND media (including retired erase blocks) with a single character (every cell written
to logical 0), and then performing a full chip erase (every cell pushed to 1) across all media (including retired
erase blocks).
Metadata that is required for operation will not be destroyed (media event log, erase counts, physical bytes
read/written, performance and thermal history), but any user-specific metadata will be destroyed.
A Purge operation performs the following:
1. Creates a unity map of every addressable block (this allows fio-sure-erase to address every block,
including previously unmapped bad blocks).
2. Performs a write cycle for each block (every cell written to 0).
3. Performs an erase cycle for each block (every cell pushed to 1).
4. Restores the bad block map.
5. Formats the drive to make the drive usable again. The utility erases all of the headers during the clear.
fio-trim-config
Description
Enables or disables the Trim feature, which reclaims available space from the file system. It is generally
recommended that Trim be enabled for best performance. TRIM is enabled by default. Running this utility with
no options displays the current Trim status. For more information, see "Trim support (on page
57 )."
NOTE: This utility affects all IO Accelerators in the system. You cannot enable or disable Trim for
only selected devices.