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    Command:

    blkdiscard

    
    
    

    SYNOPSIS

           blkdiscard [-o offset] [-l length] [-s] [-v] device
    
    
    

    DESCRIPTION

           blkdiscard  is  used  to  discard  device  sectors.  This is useful for
           solid-state drivers  (SSDs)  and  thinly-provisioned  storage.   Unlike
           fstrim(8) this command is used directly on the block device.
    
           By  default, blkdiscard will discard all blocks on the device.  Options
           may be used to  modify  this  behavior  based  on  range  or  size,  as
           explained below.
    
           The device argument is the pathname of the block device.
    
           WARNING: All data in the discarded region on the device will be lost!
    
    
    

    OPTIONS

           The  offset  and length arguments may be followed by the multiplicative
           suffixes KiB=1024, MiB=1024*1024, and so on for GiB, TiB, PiB, EiB, ZiB
           and YiB (the "iB" is optional, e.g., "K" has the same meaning as "KiB")
           or the suffixes KB=1000, MB=1000*1000, and so on for GB, TB, PB, EB, ZB
           and YB.
    
           -h, --help
                  Print help and exit.
    
           -o, --offset offset
                  Byte offset in the device from which to discard.  Provided value
                  will be aligned to the device sector  size.   Default  value  is
                  zero.
    
           -l, --length length
                  Number of bytes after starting point to discard.  Provided value
                  will be aligned to the device sector  size.   If  the  specified
                  value  extends  past the end of the device, blkdiscard will stop
                  at the device size boundary.  Default value extends to  the  end
                  of the device.
    
           -s, --secure
                  Perform  secure  discard.  Secure discard is the same as regular
                  discard except all copies of the discarded blocks possibly  cre-
                  ated  by  garbage  collection must also be erased.  It has to be
                  supported by the device.
    
           -v, --verbose
                  Print aligned offset and length arguments.
    
    
    

    AUTHOR

           Lukas Czerner
    
    
    

    SEE ALSO

           fstrim(8)
    
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