Re: Interesting FTP commenced before file fully written

[Bdietz400 <bdietz400@xxxxxxxxx>]

I recall that image catalog tape volumes do not “shrink” if it gets initialized.
Maybe close. 

I just found:

https://www.ibm.com/support/pages/understanding-storage-allocation-virtual-tape-and-how-get-storage-back-after-save-or-inztap

--
Bryan Dietz

> On Mar 28, 2022, at 6:12 PM, Don Brown via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx> wrote:
>
> Just sharing something that was a little surprising.
>
> We were testing a process to copy the nightly backup to a DR system using 
> FTP.
>
> This was an adhoc test only.
>
> Backups normally finish before 2:00am so we scheduled a ftp job to copy 
> the file from production to DR starting a 2:00am.
>
> Unfortunately the backups ran late (reason does not matter) and did not 
> complete until about 4:00am
>
> The image is 475GB and the link between Production and DR is 1GB - the 
> copy took 10+ hours.
>
> Rather than killing the job when we were advised the backups ran late I 
> was thinking that it is just a stream file and ftp is just going to read 
> from start to finish.
>
> Well I was most surprised when the image loaded into the image catalogue 
> successfully and a dsptap showed all the libraries - I was still not 
> confident the restores were going to work but they did!
>
> Now I am not suggesting this is the way to do things and while there have 
> been no errors detected it was only a test.
>
> But quite surprising all the same.
>
> Cheers
>
> Don
>
>
>
>
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