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5 Device-Mapper's "zero" target provides a block-device that always returns
7 /dev/zero, but as a block-device instead of a character-device.
12 conjunction with dm-snapshot. A sparse device reports a device-size larger
13 than the amount of actual storage space available for that device. A user can
14 write data anywhere within the sparse device and read it back like a normal
15 device. Reads to previously unwritten areas will return a zero'd buffer. When
20 To create a sparse device, start by creating a dm-zero device that's the
21 desired size of the sparse device. For this example, we'll assume a 10TB
24   TEN_TERABYTES=`expr 10 \* 1024 \* 1024 \* 1024 \* 2`   # 10 TB in sectors
27 Then create a snapshot of the zero device, using any available block-device as
30 is an available 10GB partition::
35 This will create a 10TB sparse device called /dev/mapper/sparse1 that has
36 10GB of actual storage space available. If more than 10GB of data is written