Berkeley CSUA MOTD:Entry 41884
Berkeley CSUA MOTD
 
WIKI | FAQ | Tech FAQ
http://csua.com/feed/
2025/05/24 [General] UID:1000 Activity:popular
5/24    

2006/2/16-17 [Computer/SW/Unix] UID:41884 Activity:nil 77%like:41882
2/15    I'm using rsync -ravH to make an identical backup. When
        comparing the two resulting filesystems, I notice that some
        directory files have different sizes. /usr/doc/. is 8192 and
        /backup/usr/doc/. is 4096 Any idea why this would be? I would
        like the two rsync'd filesystems to be identical sizes.
        \_ -r is included in -a for rsync.
        \_ Read up on filesystems.
        \_ Directories grow as there are more entries at that immediate level
           of the structure, then don't always give back that allocated space.
           Try making a directory, then creating 10,000 files in it, then
           deleting them all.  Note the directory size.  --dbushong
           \_ Thanks! -op
              \_ Also, different OSes/FSes do initial allocations differently.
                 If both these directories are empty, that would explain the
                 discrepancy.
                 \_ In this case they are both linux and ext3.
                    \_ Same linux versions? flavors?
                       \_ Indeed: same computer. The issue seems to be
                          the directory size that dbushong explained. I wonder
                          what is the best way to verify that these directory
                          file sizes are the only differences between the FS -op
        \_ try another tool.  unison?
2025/05/24 [General] UID:1000 Activity:popular
5/24    

You may also be interested in these entries...
2009/8/21-9/1 [Computer/SW/Unix] UID:53297 Activity:nil
8/20    When I use rsync to backup, it's pretty cool except in cases where
        I rename a directory name from the source. Rsync will just do
        a plain copy. Is there a program that'll detect renaming of
        directories (by checking for children files), or at least
        move them to a dated directory?
        \_ Not related but beware of using rsync as a backup tool.
	...
2009/7/17-24 [Computer/SW/OS/OsX] UID:53156 Activity:kinda low
7/17    -rw-r--r--@
        What does the "at sign" mean? This is on Mac OS. VMWare disk file.
        \_ The file has metadata attributes
           \_ How do I add/delete attributes to files? What about
              -rw-r--r--+ <-- what is the "+" sign? Also how do you make
              tar preserve these attributes?
	...
2009/2/26-3/5 [Computer/SW/Unix] UID:52653 Activity:nil
2/26    If I want to rsync a perforce or svn directory while users
        are checking things in, could I wind up with a corrupted copy?
        \_ sure why not.  if you are really cool, your copy of the svn
           repo is on LVM, and you snap the LVM to copy it.
           \_ It'll seem less cool when you realize you've taken a snapshot
              of a block level device, which only guarantees that this set of
	...
2008/8/27-9/3 [Computer/HW/Laptop, Computer/SW/OS/Linux] UID:50980 Activity:nil
8/27    I have a rather large linux partition.  I just got a new laptop
        and want to move all my settings and customization to that new
        computer.  how to do this?  I tried remastersys but it seems that it
        get stuck somewhere, and I am hoping it is not really trying to create
        a 26GB iso file.
        any ideas?  is there anyway i can back up my debian package database
	...
2008/6/10-13 [Computer/SW/OS/VM, Computer/SW/Unix] UID:50210 Activity:nil
6/10    Is there a handy guide to virtualizing an already running
        physical linux box into an instance of Vmware?
        \_ this probably isn't the "right" way, but I have many times
        just run rsync. ("rsync -vpa root@oldbox:/ /")  on a fresh virtual
        image.  Just make sure the partitions are the same on the virt disk
        as on the real disk and if you are using a new udev, kill the info
	...
2008/5/29-31 [Computer/HW/Drives] UID:50086 Activity:nil
5/29    Considering abandoning tape backups in favor of something like this:
http://www.thermaltakeusa.com/product/Storage/hdd_station/blacx/st0005u.asp
        Please convince me that I'm crazy.
        \_ why?
           \_ Why do I want you to convince me I'm crazy?
              \_ what are you trying to accomplish?  What is your context?
	...
2007/11/12-16 [Computer/SW/OS/Linux, Computer/SW/Unix] UID:48623 Activity:nil
11/12   how do i make a fail safe magical backup for my debian box
        that i can quickly boot from if the box explodes?
        \_ keep a linux live boot cd around for just such an emergency
           \_ And learn about 'dd'
        \_ I was hoping there was something as slick as CCC, for unix.
           \_ You can first duplicate the disk offline with dd, then just
	...
2007/11/12-16 [Computer/SW/Unix, Computer/SW/OS/OsX] UID:48607 Activity:high
11/12   Server nerds, CCC for mac is totally awesome.  is there somethng
        as cool and friendly for PC or unix?
        \_ Hi.  "CCC" is a free mac program known as "Carbon Copy Cloner".
           If you use a Mac, and have some sort of external usb or firewire
           drive, I recommend you spend 15 minutes downloading it and
           setting it up.  You can easily make a backup set up your data,
	...
2007/8/31-9/3 [Computer/SW/Unix] UID:47860 Activity:nil
8/31    Pretend I am going to be on a boat in the arctic.
        I want to upload whale song sound data while I am
        on my terrible internet connection in the middle of
        the arctic.  What would I use?  FTP seems so 80s.
        \_ FTP is a tool that works and does exactly the job you want.
           What's wrong with FTP?
	...
2007/5/5-7 [Computer/SW/Unix] UID:46533 Activity:low Cat_by:auto
5/4     Question. Say I have dir1/A and dir2/A. How do I collapse them
        together? I'm unable to do "mv dir1/A dir2" or "mv dir1/A/* dir2/A"
        \- cd /foo/.../source;tar cf - . |(cd /bar/.../dest;tar xfBp -);rm -rf .
        \_ cp dir1/A/* dir2/A; rm -rf dir1/A?  What exactly are you trying to
           do and why can't you use mv?
           \- * globbing is risky with unknown inputs. when you want to
	...
2006/11/2-3 [Computer/SW/Unix] UID:45114 Activity:nil
11/02   I have a bunch of directories with files (and other directories)
        in them. I have a mirrored copy that contains many of the same
        files, but with different dates. Is there an easy way (short of
        writing s/w to check each file against the other) to do something
        like : If date on mirror < 10/31, then sync date with other dir?
        I don't think rsync can help with this. I just need the dates
	...