EUnet Case Solution Proposition

1
EUnet Case Solution Proposition

• Danilo Djordjevic
• Nemanja Grujic
• Stevica Cvetkovic

2
Demands

• Logical picture of Mail Subsystem of an ISP
• Detailed list of hardware and software
  components

Facts

• Daily number of emails over 1 million ( 50
  spams)
• Number of accounts over 150.000
• Over 140.000 connections per day
• Web hosting over 3.000

3
Structure of Mail system
4
Logical picture

• Performance
• Scalability
• Transparency
• Modularity
• Reliability

• Clustering
• HA if node fails - takeover
• SPoF
• LB divides task
• Cisco switches for LB

5
Server Platforms

• HP Blade System
• 14 servers (2xXeon 2.8Ghz, 2Gb RAM, 2xGigabit,
  2xFC, 60Gb disk)
• Slim blade servers fit in a single chassis
• hot-swappable
• save money
• Price 25000.
  Processor
  scalability

Load Balancers

• CISCO CSS
• speed 12M packages/s,
• reliability,
• easy-to-use,
• embedded firewall
• lack of flexibility
• more expensive (but reduction cost for edge
  switches)
• Price 15000 X 2

6
Storage

• Capacity
• Mailbox 10 MB 150000users 1.5 TB
• X 2(mirror) 3TB
• 10 snapshooting 10 possibleincreases
• Approx 4TB

• Possible solution
• Low-end (Far east companies) 10 000
• Medium or Enterprise (HP EVA5000) 100 000
• High-end (HP, ...) 300 000

HP EVA5000 Why Low-cost solution,up to
35TB,snapshoting, redudant power supply,
high scalability, VRaid0, VRaid1, VRaid5 price
150 000

• Tape Library HP StorageWorks Dark Fiber 15km
  6 TB, 15000

7
OS

• Free Linux Free BSD, GenToo
• Free
• Hard to setup
• Needs highly trained staff
• Red Hat Enterprise Linux, Suse ...
• Mid-price
• Fast easy installation and setup
• Integrated packages (clustering, GFS ...)
• Full time technical support
• Windows Server 2003
• Expensive
• Easy to use
• Easy setup for security
• Includes Active Directory (LDAP)

8
Content Filters

• SMTP servers
• Process
• 1. Mail comes on SMTP server
• 2. Gray list check (lookup table - addresses)
• 3. Antivirus filter if (virus) -gt gray list
  manager rejected
• 4. Antispam filter if (spam) -gt gray list
  manager rejected
• 5. LDAP Storage
• Kaspersky the ultimate solution
• Kaspersky Anti-Spam ISP Edition
• effective centralized antispam solution
• check up to 2 million messages/day
• flexible administration
• updates are released every two hours
• Kaspersky Anti-Virus for Linux
• fully integrated with Webmin (monitoring) for
  remote configuration and management
• updates every hour
• technical support

9
Conclusions

• Core switches can become overloaded
• Computer LB vs. HW
• If primary site fails...

10
QUESTIONS?