Lines Matching refs:device

4 Device-Mapper's "zero" target provides a block-device that always returns
6 /dev/zero, but as a block-device instead of a character-device.
11 conjunction with dm-snapshot. A sparse device reports a device-size larger
12 than the amount of actual storage space available for that device. A user can
13 write data anywhere within the sparse device and read it back like a normal
14 device. Reads to previously unwritten areas will return a zero'd buffer. When
16 device is deactivated. This can be very useful for testing device and
19 To create a sparse device, start by creating a dm-zero device that's the
20 desired size of the sparse device. For this example, we'll assume a 10TB
21 sparse device.
26 Then create a snapshot of the zero device, using any available block-device as
27 the COW device. The size of the COW device will determine the amount of real
28 space available to the sparse device. For this example, we'll assume /dev/sdb1
34 This will create a 10TB sparse device called /dev/mapper/sparse1 that has
36 to this device, it will start returning I/O errors.