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Top Forums UNIX for Advanced & Expert Users Speed problems with tar'ing a 500Gb directory on an eSATA drive Post 302623095 by omnisppot on Friday 13th of April 2012 06:28:56 AM
Old 04-13-2012
[QUOTE=methyl;302622215]I don't think that tar or cp are the right commands.

To make a straight copy to another mounted filesystem and preserve permissions:
Code:
cd /filesystem_to_copy
find . -xdev -print | cpio -pdumv /new_filesystem

Ps. I have never used tar to back up anything. It is sometimes useful for moving files to alien systems.


Thanks for the input, but the goal is to move the 500Gb of data from the external drive to an offsite compute cluster. I believe the only way I can do this is ftp, and ftp only supports moving single files, not directories. GUIs like Filezilla don't work as they prompt for a new password every time the token-generated one expires.
I don't think it's possible to mount the external hard drive from a cluster that's behind a firewall - I can only connect to the cluster, not from it Smilie

---------- Post updated at 05:25 AM ---------- Previous update was at 05:20 AM ----------

Quote:
Originally Posted by Corona688
What bus speeds would you expect from your disks, omnisppot? Could you be having southbridge issues -- perhaps the bus is saturated?
Sorry, I don't know how to precisely answer that question! I know I can (if I had enough internal hard drive space) "cp -r" all the data down the SATA cable in a few hours without any issues. It certainly seems I/O on the external drive is the bottleneck with tar. Hopefully this is at the external disk end and not the mobo bus end. Hopefully (I'll find out next week) doing it on a 4-drive RAID0 will overcome that!

---------- Post updated at 05:28 AM ---------- Previous update was at 05:25 AM ----------

Quote:
Originally Posted by methyl
I agree with Corona688. Probably Hardware problem.
However I have seen a modern tar (i.e. one which can deal with files larger than 2Gb) crawl when it demands more memory.
My linux box has 16Gb RAM, but whilst doing this system usage didn't exceed 3Gb (including running the O/S and everything else).
 

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pbput(1)							     bikeshed								  pbput(1)

NAME
pbput - compress and encode arbitrary files to pastebin.com pbputs - compress, encrypt, encode arbitrary files to pastebin.com pbget - decode and decompress arbitrary files from pastebin.com SYNOPSIS
pbput [FILENAME] cat foo | pbput pbputs [FILENAME] [GPG_USER] cat foo | pbputs [GPG_USER] pbget URL [DIRECTORY] DESCRIPTION
pbput is a program that can upload text files, binary files or entire directory structures to a pastebin, such as pastebin.com. pbget is a program that be used to retrieve content uploaded to a pastebin by pbput. pbputs operates exactly like pbput, except it encrypts the data. An optional GPG_USER argument is allowed, which will sign and encrypt the data to the target user in one's keyring (which could be oneself!). Otherwise, the user is prompted for a symmetric passphrase for encrypting the content with gpg(1) before uploading. pbget will automatically prompt the receiving user for the pre-shared passphrase. pbput and pbputs can take its input either on STDIN, or as a FILENAME argument. - If STDIN is used, then the receiving user's pbget will simply paste the input on STDOUT. - If a FILENAME or DIRECTORY is passed as an argument, then it is first archived using tar(1) to preserve the file and directory attributes pbget takes a URL as its first, mandatory argument. Optionally, it takes a DIRECTORY as a second parameter. If the incoming data is in fact a file or file structure in a tar(1) archive, then that data will be extracted in the specified DIRECTORY. If no DIRECTORY is speci- fied, then a temporary directory is created using mktemp(1). In any case the uploaded/downloaded data is optionally tar(1) archived, always lzma(1) compressed, optionally gpg(1) encrypted, and always base64(1) encoded. http://pastebin.com is used by default. EXAMPLES
$ pbput /sbin/init http://pastebin.com/BstNzasK $ pbget http://pastebin.com/BstNzasK sbin/init INFO: Output is in [/tmp/pbget.bG67DwY6Zl] $ cat /etc/lsb-release | pbput http://pastebin.com/p43gJv6Z $ pbget http://pastebin.com/p43gJv6Z DISTRIB_ID=Ubuntu DISTRIB_RELEASE=11.04 DISTRIB_CODENAME=natty DISTRIB_DESCRIPTION="Ubuntu 11.04" $ pbputs /etc/shadow Enter passphrase: http://pastebin.com/t2ZaCYr3 $ pbget http://pastebin.com/t2ZaCYr3 Enter passphrase: root:09cc6d2d9d63371a425076e217f77698:15096:0:99999:7::: daemon:*:15089:0:99999:7::: bin:*:15089:0:99999:7::: sys:*:15089:0:99999:7::: .... SEE ALSO
pastebinit(1), lzma(1), base64(1), tar(1), gpg(1), mktemp(1) AUTHOR
This manpage and the utility was written by Dustin Kirkland <kirkland@ubuntu.com> for Ubuntu systems (but may be used by others). Permis- sion is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or later pub- lished by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL, or on the web at http://www.gnu.org/licenses/gpl.txt. bikeshed 6 Oct 2010 pbput(1)
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