qcow2 可以提供如下功能: sparse image file (稀疏镜像文件或精简像文件,真正使用时才分配存储空间) Cow(写时复制) ROW (写时重定向),应用于快照 compression(支持压缩) encryption(支持加密) 创建qcow2 镜像 使用gemu-img create命令可以创建qcow2镜像文件: ┌──[root@liruilongs.github.io]-[/var/lib/lib...
Red Hat Enterprise Linux provides thebzip2,gzip, andziptools for compression from a shell prompt. Thebzip2compression tool is recommended because it provides the most compression and is found on most UNIX-like operating systems. Thegzipcompression tool can also be found on most UNIX-like operating...
__le32 s_algorithm_usage_bitmap; /* For compression */ /* * Performance hints. Directory preallocation should only * happen if the EXT2_COMPAT_PREALLOC flag is on. */ //预分配的块数 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ //给目录项预分配的块数 __u8...
依据红帽公司推荐的原则,20GB 硬盘将翻成 200GB 的逻辑存储。在创建成功后,使用 [status] 参数查看新建卷的概述信息,可见在输出信息中包含了 VDO 卷创建的时间、主机名、版本、是否压缩(Compression)及是否删重(Deduplication)等。 新建的 VDO 卷设备会被乖乖地存放在/dev/mapper 目录下,以上面自定义的名字存在对...
For my primary use case, DwarFS compression is an order of magnitude better than SquashFS compression, it's 6 times faster to build the file system, it's typically faster to access files on DwarFS and it uses less CPU resources. To give you an idea of what DwarFS is capable of, here'...
DUMP: Dumping /dev/sda3 (/run/media/root/MyFile (dir /folder1)) to /root/fw.dump DUMP: Label: MyFile DUMP: Writing 10 Kilobyte records DUMP: Compressing output at compression level 2 (bzlib) DUMP: mapping (Pass I) [regular files] ...
Used for automatic rotation, compression, removal, and mailing of system log files. look Shows any lines in a file containing a given string in the beginning. losetup Set up and control loop devices. lpadmin Used to configure printer and class queues provided by CUPS (Common UNIX Printing Sys...
btrfs (B-tree 文件系统) 是个很新的文件系统(Oracel 在2014年8月发布第一个稳定版),它将会支持许多非常高大上的功能,比如 透明压缩( transparent compression)、可写的COW 快照(writable copy-on-write snapshots)、去重(deduplication )和加密(encryption )。因此,Ceph 建议用户在非关键应用上使用该文件系统。
The program gzip (GNU Zip) is one of the current standard Unix compression programs. A file that ends with .gz is a GNU Zip archive. Use gunzip file.gz to uncompress .gz and remove the suffix; to compress it again, use gzip file. gzip(GNU Zip)是当前标准的Unix压缩程序之一。 以.gz结...
Now, everything underneath/varwill also use lz4 compression. This might not matter much on a smaller system, but if we ever need to scale up our size, we’ll be happy ZFS works this way. 5.3. Creating Our Own Pools To start, we just need a simple command. ...