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Mainframe Software Solutions for z/OS and VSEn

Built for Now. Designed for Next.

Your business can’t afford downtime today — and it can’t fall behind tomorrow. That’s why the world’s leading companies rely on 21CS to deliver resilience, modernization, and a partner committed to moving mainframe technology forward.

OPTIMAn GA

See What Your Mainframe Costs, Does and Needs Next

Performance, capacity and cost in one repository, 100% z/OS native. OPTIMAⁿ streams SMF in near real time and keeps it for years, so every stakeholder works from the same data, from systems programmer to executive. Ask it a question in plain English and get the query, report or analysis back instantly. Forecast ahead, catch issues at the warning stage and see software cost beside performance, not in a separate spreadsheet.

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Our Product Portfolio

See how we're solving the industry's toughest challenges with our range of offerings. 

  • SENTINELn Preview

    SENTINELn

    Data Set Protection Retooled and Reimagined

    Real-time change tracking, automatic backups, reports in batch, and side-by-side comparisons - all in one intuitive platform. Teams can optimize performance and program confidently without compromising critical z/OS data sets. 

  • TRANSVERSEn Preview

    TRANSVERSEn

    Swap Your Entire Storage Infrastructure - Live

    Change storage vendors or upgrade technology while maintaining 24/7 application availability. Our dynamic swap capability means zero downtime, zero risk, and zero excuses.

  • STRATUSn preview

    STRATUSn

    Bridge Your Mainframe to Any Cloud

    Move massive z/OS datasets to any S3-compatible cloud at scale, no middleware required. Share data across sysplexes and hybrid environments while maintaining complete control from your mainframe.

  • VSEn preview

    VSEn

    Run Your VSE Workloads With Confidence

    Full compatibility with IBM z/VSE plus continuous innovation for modern hardware. With 25+ vendors in our ecosystem and a dedicated support team, VSEn ensures your mission-critical systems keep evolving.

  • Tape/Assist

    Tape/Assist®

    Move Massive Tape Libraries With Ease

    Migrate petabytes of critical tape data seamlessly while your applications keep running. After 160+ successful migrations and 102,000TB moved, we've made the seemingly impossible routine.

IBM

Proud IBM Partner for 30+ years

We collaborate with leading enterprises to deliver solutions that push mainframe technology forward while maintaining the reliability you depend on.

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What's Your Biggest Mainframe Challenge?

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