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„Building Mission-Critical IT systems‟
an Exciting and Fulfilling Journey
Dr Deepak B Phatak, Umesh Bellur, Om Damani
Kanwal Rekhi Building
Department of Computer Science and Engineering
IIT Bombay
Presentation at Institute award lecture series
IRCC, 17 August 2011
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Mission Critical Systems
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Must function …
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Correctly
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Continuously
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- Disaster Recovery
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Effectively
Dr Deepak B Phatak, IIT Bombay Mission critical IT systems 8
- Response time
- Throughput
- Cost per transaction
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Some Characteristics
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LoC: 1 Million +
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Typical life - 20 Years
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- Change is the way of life
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- Software changes are
“special”
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- Growth in Volumes
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- Number of transactions
- Number of users
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- Technology obsolescence
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Depository System
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Trading in Stocks (shares)
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Settlement
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Transfers
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Reconciliation
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Processing Window
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- Daily cycle
- EoD duration
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Existing System
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- CICS, COBOL, DB2
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- IBM Mainframe
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1595 MIPS
- 3 Lakh Transactions/Hour
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Projections – Tx/Hour
3rd Year - 5 L (20L/day)
5th Year - 10L (40L/day)
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Projections – No of users
3rd Year - 160L
5th Year - 200L
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Projections for 10th Year
- Peak Tx/Hour 40L
- No of Users 500L
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Decision to rewrite
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- Multi-tier Architecture
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- Java, App Servers
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- DBMS
- Query Parallelism
- Partitions
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- Product agnostic
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Expectations
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- Better performance
- Superior Scaling
- Lower cost
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Proof of Concept
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- Rewrite sample TXs
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- Run on Multiple platforms
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The „Rewrite‟ Project
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NSDL to manage
TCS to execute
IIT to advise
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Architecture, Design
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Use of „Hibernate‟
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- Reviews at each stage
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Development, testing
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The „story‟
- after 400 person-years
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Performance: Throughput
13 L Tx/Hr on 890 MIPS
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13 L Tx/Hr on 890 MIPS
As against
3 L Tx/Hr on 1595 MIPS
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Performance:
Typical turn-around time
2 Minutes
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2 Minutes
As against
30 to 40 minutes
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The people
- who „wrote‟ this story
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IIT Bombay
- Om Damani
- Umesh Bellur
- Deepak Phatak
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TCS
- Shekhar Shukla
- Manish Dhall
- Sunil Batra
- …
Dr Deepak B Phatak, IIT Bombay Mission critical IT systems 55
NSDL
- Rajesh Doshi
- Yatin Nerurkar
- …
Dr Deepak B Phatak, IIT Bombay Mission critical IT systems 56
The Visionary Leader
Chandrakant Bhave
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And the New system
- happily lives hereafter
