small question about tape-based dumps
tajudd at gmail.com
Sun Oct 18 02:09:24 UTC 2009
On 10/17/09, Stevan Tiefert <stevan-tiefert at kabelmail.de> wrote:
> Am Samstag, den 17.10.2009, 18:49 -0600 schrieb Tim Judd:
>> On 10/17/09, Jerry McAllister <jerrymc at msu.edu> wrote:
>> > You do not need to. dump alrady writes that when it finishes each time.
>> > If you to that, you will get a second one at that location.
>> > You do not need to do the rewind and mt fsf between each dump. I just
>> > do it to make it very clear to myself in my scripts what I am expecting
>> > and that I am doing it right.
>> > ////jerry
>> If dump is the tool for tapes, and tar is named after tape archives...
> Please, no flamewar!!!
Wasn't planning on starting one. Sorry if it came across that way.
>> Do both of these utilities write the *proper* EOF to whatever medium
>> it's writing to?
> They both write EOF.
>> I bring this up, because dump can also write to a file on a formatted
>> FS. Does the file end with this same EOF? What does tar do?
> There is only one EOF: The EOF.
>> Why have a mt weof function if it's useless? I'm loosing the logic in
>> this one, trying to make sure things work as they should. I admit
>> tapes on bsd are so foreign to me, I might as well be speaking
> weof is not useless. There are some file operations without writing an
> EOF, like streams or something like that, but tar and dump are writing
> with an EOF at the end of files :-)
So it's a item for "good measure" rather than an item "as necessity"
in creating backups.
Thanks for all the info. I'm happy knowing more.
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