Lines Matching +full:image +full:- +full:specific

1 .\"-
2 .\" Copyright (c) 2004-2016 Maxim Sobolev <sobomax@FreeBSD.org>
31 .Nd compress disk image for use with
46 utility compresses a disk image file so that the
48 class will be able to decompress the resulting image at run-time.
49 This allows for a significant reduction of size of disk image at
56 .Bl -enum
60 image is split into clusters; each cluster is compressed.
69 .Bl -tag -width indent
71 Select a specific compression algorithm.
105 .Va 0-9 .
114 .Va 1-9 .
123 .Va 1-19 .
129 Enable de-duplication.
134 Setting this option results is moderate decrease of compressed image size,
135 typically around 3-5% of a final size of the compressed image.
163 Split the image into clusters of
172 Disable zero-block detection and elimination.
178 detects and compresses zero blocks in a space-efficient way.
181 increases compressed image sizes slightly, typically less than 0.1%.
186 For large cluster sizes (16kB and higher), typical overall image compression
189 are only 1-2% less than those achieved with
191 over the entire image.
198 Additionally, the threshold at 16-32 kB where a larger cluster size does not
210 The de-duplication is a
212 specific feature and while it does not require any changes to on-disk
213 compressed image format, however it did require some matching changes to the
232 .Ex -std
235 The following describes how to create and mount a uzip image.
237 Create a file system image:
238 .Bd -literal -offset indent
242 Create the uzip image, the output file will be named src.img.uzip:
243 .Bd -literal -offset indent
248 .Bd -literal -offset indent
252 Create an MD device backed by the uzip image:
253 .Bd -literal -offset indent
254 mdconfig -f /src.img.uzip
257 Mount the uzip image:
258 .Bd -literal -offset indent
259 mount -o ro /dev/md0.uzip /mnt