Provided by: nbdkit_1.16.2-1ubuntu3_amd64
nbdkit-pattern-plugin - plugin to serve a fixed pattern of data for testing
nbdkit pattern [size=]SIZE
"nbdkit-pattern-plugin" is a plugin for nbdkit(1) which serves a fixed pattern of data, read only. This is used for testing nbdkit filters and NBD clients. The fixed pattern is the offset, as a 64 bit big endian integer, every 8 bytes. In hexadecimal this looks like: offset data 0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 08 0010: 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 18 0020: 00 00 00 00 00 00 00 20 00 00 00 00 00 00 00 28 ↗ └──────────┬──────────┘ byte at offset 0x28 │ │ 64 bit big endian int encoding offset 0x28 The size of the virtual disk must be specified using the "size" parameter. If the size is not a multiple of 8 then the last 8 byte offset in the pattern is truncated. Largest possible size nbdkit itself limits plugins to 2⁶³-1 bytes (decimal: 9223372036854775807, hexadecimal: 0x7fff_ffff_ffff_ffff). To test if NBD clients are free of bugs (not to mention nbdkit itself) you can use: nbdkit pattern 9223372036854775807 Note this is too large for qemu to open.
[size=]SIZE Specify the virtual size of the disk image. This parameter is required. "size=" is a magic config key and may be omitted in most cases. See "Magic parameters" in nbdkit(1).
$plugindir/nbdkit-pattern-plugin.so The plugin. Use "nbdkit --dump-config" to find the location of $plugindir.
"nbdkit-pattern-plugin" first appeared in nbdkit 1.6.
nbdkit(1), nbdkit-plugin(3), nbdkit-data-plugin(1), nbdkit-full-plugin(1), nbdkit-null-plugin(1), nbdkit-offset-filter(1), nbdkit-random-plugin(1), nbdkit-zero-plugin(1).
Richard W.M. Jones
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