Mainframe Cloud Hosting And DR Requirements

What you need in the way of cloud hosting and disaster recovery services is probably what you have now (or a subset of what you have now).

The best starting point for any discussion of remote hosting services begins with a profile of your current requirements.  We can do this informally over the phone or by email.  We're good listeners and we take good notes.  But in our experience the best way to get the ball rolling is for us (and for you) to get all the details down in writing in a simple, orderly way.

So, what we've done is to first list the questions we need you to answer.  After that we went over the same points and broke them down into details, and the result is a form you can print and fill out.  The form may look kind of long at first but bear in mind that only some of the questions apply to your particulary situation.  Consequently, you actually only need to fill out part of the form, possibly only a small part.

We have also made this worksheet available in PDF format.  The PDF is a live (but local) form; you can fill it out from within Acrobat Viewer.

Mobile?  You can print this Printer vendors provide free mobile apps so you can print our worksheet on a network-attached printer.  For instance, HP has ePrint; Lexmark has Lexmark Mobile Printing; Canon, Brother and Epson have their own apps; etc.  If you tap this link to the PDF worksheet your mobile device will offer you options:  typically, your choices will include printing right now (via a mobile printing app), viewing the PDF (using a PDF reader app) or saving the PDF file.

Anyway, let's get started:

  1. What is the proposed timing for the inception of potential hosting services?
  2. How long a term is required or estimated (in months)?
  3. How much processing capacity is required in MIPS or MSUs?
  4. Does this current system run in a shared or dedicated CPU/LPAR?
  5. How much DASD space is required? (number and type of volumes, i.e., qty 34 type 3390-03)
  6. How many simultaneous tape drives, and what type (3480/3490/3590) are used at peak tape processing periods?
  7. How many tape cartridges currently exist in your library?
  8. Printing requirements:  Please list channel-attached.  Also list TCP/IP-attached.
  9. What IBM or third party software is needed?  What are the license terms?  Are any licenses currently owned?
  10. What types and versions of IBM OS are you running?
  11. What security package, such as RACF, are you using?


Processor model
OS type and version
Average CPU utilization (%)
Peak CPU utilization (%)
CPU utilization trend (up/down)
Do you use JES2, JES3 or VSE Power
Current MIPS installed
MIPS actually required
MIPS trend (up/down) over next 3–5 years
How many LPARS, what size?
Channels (qty of FICON, ESCON, parallel)
Number and type of OSA cards
CICS regions
DB2 regions
IMS regions
Other regions
Other noteworthy facts about your system

Disk Storage

Subsystem makes, models and qty
Total GB capacity
How many 3380 A/D/J volumes?
How many 3380-E volumes?
How many 3390-X1 volumes
How many 3390-X2 volumes
How many 3390-X3 volumes
How many 3390-X9 volumes
Storage growth per year (%)


How many 3480?
How many 3490?
How many 3590? Which types?
How many IBM VTS? Which models?
StorageTek silos? Details please.
StorageTek VTM? Details please.
CA Vtape? Details please.
MagStar or similar STK? Details please.
Other offline and nearline devices
Cartridges: How many 3480 in use?
Cartridges: How many 3490 in use?
Cartridges: How many 3490 in use?

Other peripherals

How many 3475 front ends required?
How many 3X74 local controllers in use?
How many 3X74 remote controllers in use?
How many PCs using emulation?
How many actual green screens?
Concurrent users: Typical number? Maximum?
Type and qty of channel-attached printers?
Type and qty of TCP/IP printers?

Disaster Recovery

Do you require disaster recovery?
Current DR provider
When does you DR contract end?
Current monthly fee?
Number of DR tests per year?
Where is the current DR system located?


IBM names, numbers, versions, terms
ISV vendors, products, versions, terms