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Full Discussion: backup
Top Forums UNIX for Dummies Questions & Answers backup Post 302223816 by buffoonix on Monday 11th of August 2008 01:18:48 PM
Old 08-11-2008
Quote:
dd if=/dev/sda | rsh user@dest "gzip -9 >20030220-backup-sda.dd.gz"
Why sending the whole stuff over the wire to compress only afterwards?
Ok, one reason could be the box to be backed up hadn't enough processing resources currently.
But is wasting bandwidth really the better choice?
How about doing the compression first?
Code:
dd if=/dev/sda | gzip -c9 | rsh remuser@remhost 'cat >whateveryoulike.gz'

But dd maybe isn't the best of coices, and if so one should possibly try a bigger than default block size.
On non-Linux systems I usually would go for the dump/restore siblings of the used filesystem type. But Linux's dump/restore I think was notorious for being broken (but maybe not anymore?)
If the disk or single partitions of it weren't almost fully used up
you can really speed things up by using one of those clonefs* tools which come with distros like Insert (have forgotten their exact name)
because they would only copy actually allocated blocks.
 

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MKFS.MINIX(8)						       System Administration						     MKFS.MINIX(8)

NAME
mkfs.minix - make a Minix filesystem SYNOPSIS
mkfs.minix [options] device [size-in-blocks] DESCRIPTION
mkfs.minix creates a Linux MINIX filesystem on a device (usually a disk partition). The device is usually of the following form: /dev/hda[1-8] (IDE disk 1) /dev/hdb[1-8] (IDE disk 2) /dev/sda[1-8] (SCSI disk 1) /dev/sdb[1-8] (SCSI disk 2) The device may be a block device or a image file of one, but this is not enforced. Expect not much fun on a character device :-). The size-in-blocks parameter is the desired size of the file system, in blocks. It is present only for backwards compatibility. If omit- ted the size will be determined automatically. Only block counts strictly greater than 10 and strictly less than 65536 are allowed. OPTIONS
-c, --check Check the device for bad blocks before creating the filesystem. If any are found, the count is printed. -n, --namelength length Specify the maximum length of filenames. Currently, the only allowable values are 14 and 30 for file system versions 1 and 2. Ver- sion 3 allows only value 60. The default is 30. -i, --inodes number Specify the number of inodes for the filesystem. -l, --badblocks filename Read the list of bad blocks from filename. The file has one bad-block number per line. The count of bad blocks read is printed. -1 Make a Minix version 1 filesystem. This is the default. -2, -v Make a Minix version 2 filesystem. -3 Make a Minix version 3 filesystem. -V, --version Display version information and exit. The long option cannot be combined with other options. -h, --help Display help text and exit. EXIT CODES
The exit code returned by mkfs.minix is one of the following: 0 No errors 8 Operational error 16 Usage or syntax error SEE ALSO
fsck(8), mkfs(8), reboot(8) AVAILABILITY
The mkfs.minix command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/. util-linux June 2015 MKFS.MINIX(8)
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