Shirt Pocket Discussions  
    Home netTunes launchTunes SuperDuper! Buy Now Support Discussions About Shirt Pocket    

Go Back   Shirt Pocket Discussions > SuperDuper! > General

 
 
Thread Tools Rating: Thread Rating: 2 votes, 5.00 average. Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 06-10-2005, 02:13 AM
steve steve is offline
Registered User
 
Join Date: Jun 2005
Location: Billings, MT
Posts: 4
Question Concerned about hard links

I'm a new owner of SuperDuper, and I've been doing some testing under Mac OS X 10.3.9.

One discovery has me a bit puzzled and concerned. After doing a simple clone operation to create a bootable volume, I see that hard links are apparently not preserved. This can be observed in Terminal by using the "ls -li" command. Source files (not directories) with a link count higher than 1 inevitably show up on the target with a link count of 1.

Examining inode numbers adds more evidence that hard links are lost. Instead of multiple directory entries sharing a single inode number, each directory entry ends up with a unique inode number. That means that the original file, which had multiple directory entries pointing to it, has been duplicated so that each directory entry points to its own copy.

This seems like a waste of space, but more importantly, could lead to software malfunctions if hard links are assumed to exist when files are updated. Do we know that all those hard linked files are never manipulated by Mac OS X, so there's no need to worry? Couldn't third party software use hard links and get tripped up by this too?

Hard links are especially abundant in /usr/share/...; there are hundreds and hundreds of them. (A simple test directory is /usr/share/zoneinfo/US.)

For comparison I tried cloning using the asr command in Terminal, and also Carbon Copy Cloner (which uses the ditto command). They both play it safe and preserve hard links.

I'm new to SuperDuper, and I'm no expert on unix either, but this seems like an issue worth exploring. Anyone more savvy about these things have any thoughts?

Steve
Reply With Quote
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Can't boot from firewire disk negativeduck General 32 01-27-2008 04:54 PM
What Hard Drive to use rayc325 General 7 06-18-2006 08:22 AM
Hard drive size needed for backup? Hoosier_1701 General 8 05-20-2006 08:49 AM
SuperDuper! as backup/restore program? Staxman General 17 06-02-2005 02:30 PM
Partition an external hard drive problem andrew_aes General 1 05-25-2005 08:45 AM


All times are GMT -4. The time now is 02:39 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.