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High Availability (HA) –
virtual server environment
Fachakademie für Angewandte Informatik
Subject: English
© Hannes Gastl
agenda
� Why this topic?
� actual situation
� The aims of this project?
� definition HA
� HA cluster models
� options for my company
� cost overview
Hannes Gastl FAAI 2010 - "Virtualisierung" 2
Why this topic?
� 1 year ago, server infrastructure changed
� server virtualization
� application centralizing
� Hardware is fully redundant
� external audit (FMA, OeNB) comes to the conclusion this is not enough
Hannes Gastl FAAI 10- „High Availability" 3
actual situation� for the user applications (terminal server):
� 12 virtual citrix servers on 3 esx-hosts
� 3 physical citrix servers
� each server is fully redundant
� “standard” server: (domain controller, gateway, DNS, archive, mail-server…)� 9 virtual servers on 2 esx-hosts
� full redundant (HA on esx)
� 2 SANs (Raid5) for data storage and data backup
� server room with air conditioning, fire control, uninterrupted power supply (USV) and backup data circuit
Hannes Gastl FAAI 10- „High Availability" 4
actual situation� system crash due to a hardware failure is improbable
� not safety enough for the external audit
� single point of failure:
� server room location for itselfbig fire, vandalism, plane crash, long power cut, …
� -> 20 branches cannot work, headquarter cannot work, no chance to buy / sell stocks
Hannes Gastl FAAI 10- „High Availability" 5
project aims
� built a second server room
� this server room should manage the work environment if the first server room break down
� 99,99% - 99,999% availability for the server environment
� better performance because of load balancing
Hannes Gastl FAAI 10- „High Availability" 6
definition high availability� 1 year = 8760 hours
Hannes Gastl FAAI 10- „High Availability" 7
availability min. up time [h] max. down time [h] max. down time [min]
99% 8672,4 87,6 5256
99,9% 8751,24 8,76 525,6
99,99% 8759,124 0,876 52,56
99,999% 8759,91 0,0876 5,3
HA cluster models� 4 high availability techniques (NetApp)
� Basis:
� 2 server rooms in different locations
� hardware, SAN (diskshelf), switch… on each location
� a controller on each location for synchronizing the data
Hannes Gastl FAAI 10- „High Availability" 8
SnapMirror (asynchronous)
Hannes Gastl FAAI 10- „High Availability" 9
Stretched MetroCluster
Hannes Gastl FAAI 10- „High Availability" 10
Switched MetroCluster
Hannes Gastl FAAI 10- „High Availability" 11
Fabric MetroCluster
Hannes Gastl FAAI 10- „High Availability" 12
options for VB TIS5 basic possibilities
� 2nd server room in the headquarter in IBK
� 2nd server room in the 2nd headquarter in SZ
� 2nd server room in the ARZ IBK by renting rack space
� lock server room in headquarter1st server room in ARZ IBK, 2nd server room in ARZ Hall by renting rack space and using HA techniques from ARZ
� lock server room in headquarter 1st server room in ARZ IBK, 2nd server room in ARZ Hall by IaaS (Infrastructure as a Service - using hardware techniques from the ARZ)
Hannes Gastl FAAI 10- „High Availability" 13
preferred options� 3 offers:
� 1st server room headquarter IBK –2nd server room ARZ IBK by renting rack space
� 1st server room ARZ IBK –2nd server room ARZ Hall by renting rack space
� 1st server room ARZ IBK –2nd server room ARZ Hall by IaaS
Hannes Gastl FAAI 10- „High Availability" 14
cost overview� (A) HGS IBK <-> ARZ IBK by renting rack space
� initial: € xxx.xxx(NetApp Switched MetroCluster € 230.000,-)
� 4 years p.a.: € xxx.xxx,-
� (B) ARZ IBK <-> ARZ Hall (IaaS)� initial: € xx.xxx
� 4 years p.a.: € xx.xxx,-
� reduction of costs in VB TIS(only B)� initial: € xx.xxx
� 4 years p.a.: € xx.xxx,-
Hannes Gastl FAAI 10- „High Availability" 15
factor of influence� costs (initial, regularly)
� dependency on other companies
� different involved companies
� more complexity
� the right to say in a matter
� hardware actuality
� time for services
� . . .
Hannes Gastl FAAI 10- „High Availability" 16
Any further questions – please ask ☺
Hannes Gastl FAAI 10- „High Availability" 17
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