[Info-vax] ZIP and UNZIP maximum file size

[Lester Dreckow]

Hi,

Just wondering, now that Zip 3.0 and Unzip 6.0 support file sizes
larger than 2GB, do we know what the upper limit is?

Best info I can find seems to be (http://www.info-zip.org/
FAQ.html#limits) …

        uncompressed size of a single file: 4 GB; This is also not a
hard limit …
        compressed size of a single file: 4 GB

But trying it (before finding the above), it has successfully zipped
and unzipped a 40GB backup saveset via an 11GB zip file.  "Unzip -t"
was OK and DIFF confirmed the resultant unzipped saveset had no
differences.

It zipped in 64 minutes and unzipped in 34 minutes, running on …
$ tcpip show version

  HP TCP/IP Services for OpenVMS Industry Standard 64 Version V5.6 -
ECO 5
  on an HP rx2660  (1.67GHz/9.0MB) running OpenVMS V8.3-1H1

$

The outputs …
$ dir/dat/siz/wid=siz=12 .bck,.zip

Directory DISK3:[BACKUP.Z]

Z.BCK;1                  85106448  28-NOV-2011 23:23:53.89
Z.ZIP;1                  24983686  29-NOV-2011 00:38:37.23

Total of 2 files, 110090134 blocks.
$

Regards,
Lester Dreckow