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Full Discussion: Best way to copy 4Tb of data from one filesystem to another
Operating Systems Solaris Best way to copy 4Tb of data from one filesystem to another Post 302998042 by Peasant on Wednesday 24th of May 2017 12:15:39 PM
Old 05-24-2017
Do it on a block level if you can.

Use zfs send / receive using netcat (the data stream is not encrypted over network).
It really versatile, poor man enterprise level file system replication, features matching expensive storage arrays.

For local stuff, mirror the pool and use zpool split.
If you are using SVM, mirror, remove from mirror, use the copy.

Using cp/rsync on large number of files is bound to take longer on same hardware.

Alternatively, you can use dd as well if you want entire disks, but it's a one time crude operation and long requires downtime on source.
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LEARN ABOUT DEBIAN

pull-debian-debdiff

PULL-DEBIAN-DEBDIFF(1)					      General Commands Manual					    PULL-DEBIAN-DEBDIFF(1)

NAME

       pull-debian-debdiff - find, download, and generate a debdiff

SYNOPSIS

       pull-debian-debdiff [options] <package> <version> [distance]

DESCRIPTION

       pull-debian-debdiff attempts to find and download a specific version of a Debian package and its immediate parent to generate a debdiff.

OPTIONS

       package
	      The source package to download and diff.

       version
	      The most recent of the two versions you want to diff.

       distance
	      If specified (default 1), the debdiff is against that many versions previous.

       -h, --help
	      Display the usage instructions and exit.

       -f, --fetch
	      Simply download the specified version and exit.

       -d DEBIAN_MIRROR, --debian-mirror=DEBIAN_MIRROR
	      Use  the	specified  mirror.   Should  be  in  the  form	http://ftp.debian.org/debian.	If the package isn't found on this mirror,
	      pull-debian-source will fall back to the default mirror.

       -s DEBSEC_MIRROR, --debsec-mirror=DEBSEC_MIRROR
	      Use the specified Debian security mirror.  Should be in the form http://security.debian.org.  If the package  isn't  found  on  this
	      mirror, pull-debian-source will fall back to the default mirror.

       --no-conf
	      Do not read any configuration files, or configuration from environment variables.

ENVIRONMENT

       All  of	the  CONFIGURATION  VARIABLES  below are also supported as environment variables.  Variables in the environment take precedence to
       those in configuration files.

CONFIGURATION VARIABLES

       The following variables can be set in the environment or in ubuntu-dev-tools(5) configuration files.  In  each  case,  the  script-specific
       variable takes precedence over the package-wide variable.

       PULL_DEBIAN_DEBDIFF_DEBIAN_MIRROR, UBUNTUTOOLS_DEBIAN_MIRROR
	      The default value for --debian-mirror.

       PULL_DEBIAN_DEBDIFF_DEBSEC_MIRROR, UBUNTUTOOLS_DEBSEC_MIRROR
	      The default value for --debsec-mirror.

SEE ALSO

       debdiff(1), dget(1), pull-debian-source(1), ubuntu-dev-tools(5)

AUTHORS

       pull-debian-debdiff was written by Stefano Rivera <stefanor@ubuntu.com>, a clone of a tool by Kees Cook <kees@ubuntu.com>.

       This manual page was written by Stefano Rivera, based on the original by Andrew Starr-Bochicchio <a.starr.b@gmail.com>.

ubuntu-dev-tools						   December 2010					    PULL-DEBIAN-DEBDIFF(1)
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