Welcome to Virtual Software Systems, Inc.

Home of VPARS, ShadowDisk/Z, and VTAPE

 
VSSI documentation is online on the Product Support page.

VPARS, ShadowDisk/Z, and VTAPE install files are downloadable via the Instructions page.

2013-05-20 VPARS, ShadowDisk/Z, and VTAPE packages 5514 are available, and incorporate all VSSI PTFs through 550062. The VSSI Installation process for packages at Build Level 5512 and higher has changed significantly; you can read about it here.

2013-05-04 For all users who have downloaded any 5512 package prior to April 28, 2013, and are experiencing miscellaneous build errors, an updated procedure is available here.

News

.       The ShadowDisk/Z VSSI product (i.e., VPARS for z/Linux) beta is now available on the VSSI FTP site.
    It's been a long slog – but worth it. Read all about it here and here.
    We will be testing with selected customers, and will ship GA upon successful conclusion of this effort.
    We'll keep you posted as to GA availability.