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Special Forums Hardware Filesystems, Disks and Memory Why we don't need to defrag UNIX FS? Post 302451143 by Corona688 on Sunday 5th of September 2010 11:21:32 PM
Old 09-06-2010
Quote:
Originally Posted by amro1
We DO need from time to time to defrag UNIX related filesystem. The problem is that unlike NTFS (which is VERY GOOD, well designed, originated in absolutely terrific OpenVMS, file system)
MS must have made an absolute hash of it, then because, as I've said, I've seen it fragment terribly on drives only 50% full. It certainly doesn't seem to make any effort to obey your ideal of squashing everything at the head of the drive, either.
Quote:
However, if you on single drive PC with Linux on it and do something that makes a lot of small files, then removes them and then do it over again, your system will be fragmented as a hell.
I use a distro that keeps 1.9 gigs of metadata in a tree of 100,000 tiny files with frequent replacement. I've seen ReiserFS fragment badly on that(the files didn't fragment, but the directories themselves did, leading to very slow ls), but not the more common Linux filesystems.
Quote:
By doing that, the restored files fill into the drive one by another, no gaps and no interleaving.
You've got an odd idea of fragmentation. It doesn't mean "all files in one giant clump at the start of the drive", which is a recipe for fragmentation -- growing files will have no room to expand, and get scattered in pieces when they do.

And there's certainly better alternatives to dumping the entire filesystem, like shake.
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uri_urn(n)					    Tcl Uniform Resource Identifier Management						uri_urn(n)

__________________________________________________________________________________________________________________________________________________

NAME
uri_urn - URI utilities, URN scheme SYNOPSIS
package require Tcl 8.2 package require uri::urn ?1.1.2? uri::urn::quote url uri::urn::unquote url _________________________________________________________________ DESCRIPTION
This package provides two commands to quote and unquote the disallowed characters for url using the urn scheme, registers the scheme with the package uri, and provides internal helpers which will be automatically used by the commands uri::split and uri::join of package uri to handle urls using the urn scheme. COMMANDS
uri::urn::quote url This command quotes the characters disallowed by the urn scheme (per RFC 2141 sec2.2) in the url and returns the modified url as its result. uri::urn::unquote url This commands performs the reverse of ::uri::urn::quote. It takes an urn url, removes the quoting from all disallowed characters, and returns the modified urls as its result. BUGS, IDEAS, FEEDBACK This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category uri of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for either package and/or documentation. KEYWORDS
rfc 2141, uri, url, urn CATEGORY
Networking uri 1.1.2 uri_urn(n)
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