Lines Matching +full:data +full:- +full:size

2 dm-zero
5 Device-Mapper's "zero" target provides a block-device that always returns
6 zero'd data on reads and silently drops writes. This is similar behavior to
7 /dev/zero, but as a block-device instead of a character-device.
9 Dm-zero has no target-specific parameters.
11 One very interesting use of dm-zero is for creating "sparse" devices in
12 conjunction with dm-snapshot. A sparse device reports a device-size larger
14 write data anywhere within the sparse device and read it back like a normal
16 enough data has been written to fill up the actual storage space, the sparse
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
27 Then create a snapshot of the zero device, using any available block-device as
28 the COW device. The size of the COW device will determine the amount of real
36 10GB of actual storage space available. If more than 10GB of data is written