[Info-vax] backup /image on Windows or Unix?

[Bill Gunshannon]

In article <kdp00p$ngj$1 at news.albasani.net>,
	Jan-Erik Soderholm <jan-erik.soderholm at telia.com> writes:
> Bill Gunshannon wrote 2013-01-23 16:27:
>> In article <kdorln$bsu$2 at dont-email.me>,
>> 	Simon Clubley <clubley at remove_me.eisner.decus.org-Earth.UFP> writes:
>>> On 2013-01-23, Dirk Munk <munk at home.nl> wrote:
>>>> One of the nicest features of VMS is backup/image. Take a badly
>>>> fragmented disk as input, and you will get a beautiful structured disk
>>>> as output, all files contiguous etc.
>>>>
>>>> I have always been looking for utilities that can do the same in Windows
>>>> and Unix, but I never found them.
>>>>
>>>
>>> In Unix land have you considered a dump and restore sequence ?
>>
>> Or the fact that defragmentation is seldom if ever needed on Unix filesystems.
>>
>> ** /dev/ad4s1a
>> ** Last Mounted on /
>> ** Root file system
>> 2138 files, 286668 used, 219819 free (2883 frags, 27117 blocks, 0.6% fragmentati
>> on)
>>
>> ** /dev/ad4s1e
>> ** Last Mounted on /tmp
>> 18 files, 21 used, 506466 free (34 frags, 63304 blocks, 0.0% fragmentation)
>>
>> ** /dev/ad4s1f
>> ** Last Mounted on /usr
>> 511196 files, 9230891 used, 23406146 free (77194 frags, 2916119 blocks, 0.2% fra
>> gmentation)
>>
>> ** /dev/ad4s1d
>> ** Last Mounted on /var
>> 28558 files, 91462 used, 2657823 free (23015 frags, 329351 blocks, 0.8% fragment
>> ation)
>>
>> ** /dev/da0s1d
>> ** Last Mounted on /archive
>> 241149 files, 93064509 used, 143440310 free (9678 frags, 17928829 blocks, 0.0% f
>> ragmentation)
>>
>> ** /dev/ar0s1d
>> ** Last Mounted on /users
>> 1128838 files, 150083077 used, 86421742 free (166710 frags, 10781879 blocks, 0.1
>> % fragmentation)
>>
>> bill
>>
> 
> How is that "n.n % fragmentation calculated ?
 
Don't know if I ma qualified to answer that.  It's in fsck so you can
always look at the sources if it really matters to you.  I only know
that years ago (when I was still active in USENIX and my employer was
actually willing to pay for me to go to conferences) I listened to talks
by people like Kirk McKusick explaining how fragmentation was handled
in the file system so defraging just wasn't needed.  Probably explains
why there have never been any third-part defrag programs for Unix (at
least none I have ever seen), no market.  :-)

bill
 

-- 
Bill Gunshannon          |  de-moc-ra-cy (di mok' ra see) n.  Three wolves
billg999 at cs.scranton.edu |  and a sheep voting on what's for dinner.
University of Scranton   |
Scranton, Pennsylvania   |         #include <std.disclaimer.h>