High Availability Options for IBM i
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Transcript of High Availability Options for IBM i
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All trademarks and registered trademarks are the property of their respective owners.© HelpSystems LLC. All rights reserved.
with Glenn Robinson and Ash Giddings
High Availability Options for IBM i
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HelpSystems Corporate Overview. All rights reserved.
Ash GiddingsProduct Manager
HelpSystems
Today’s Presenters
Glenn RobinsonPower Systems Architect
RSI Consulting
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HelpSystems Corporate Overview. All rights reserved.
• What is high availability?• Current options• Which method is best?• Additional resources• Q&A and recap
Agenda
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What is high availability?
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HelpSystems Corporate Overview. All rights reserved.
What is high availability?
In information technology, high availability refers to a system or component that is continuously operational for a desirably long length of time.
Availability can be measured relative to "100% operational" or "never failing."
24/7
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HelpSystems Corporate Overview. All rights reserved.
What is high availability?
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Current options
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HelpSystems Corporate Overview. All rights reserved.
HA/DR options for IBM i
• Logical replication– Replication at the object level provided by third-party software
• PowerHA geographic mirroring– Replication by the IBM i operating system– Block-level replication of an independent ASP (IASP) to another IBM i LPAR– Internal or external storage– Requires PowerHA license
• Storage replication– Replication by the storage system, e.g. V7000– Block-level replication of an IASP or an entire system– External storage only
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HelpSystems Corporate Overview. All rights reserved.
Logical replication
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Pros– Target can be used for read-only access to replicated data– Journaling is mandatory– Source and target LPAR are both active
Cons– Requires third-party software– Operating system overhead; depends on how much data is being replicated– Objects to be replicated need to be defined to the replication software– Estimates denote around 182 man-hours per year for monitoring
Comments– Popular customer choice– Data replicated over IP only
Logical replication
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HelpSystems Corporate Overview. All rights reserved.
PowerHA geographic mirroring
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HelpSystems Corporate Overview. All rights reserved.
• Pros– All data is copied from source to target as this is disk mirroring– Choice of synchronous and asynchronous replication– Minimal amount of monitoring required
• Cons– Requires PowerHA license on each LPAR– Only an IASP can be mirrored– Operating system overhead; depends on how much data is being replicated– The IASP can only be accessed by one LPAR at any one time– Fairly complicated PowerHA clustering configuration
• Comments– Replication over IP only– Journaling not required but is recommended– Not widely implemented
PowerHA geographic mirroring
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HelpSystems Corporate Overview. All rights reserved.
Metro Mirror
Global Mirror
Global Mirrorwith Change Volumes
Storage-based mirroring
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HelpSystems Corporate Overview. All rights reserved.
Disaster recovery testing without interruption
• Storage replication from site 1 to site 2
• Create a point-in-time FlashCopy of the volumes at site 2
• Run an LPAR over the J2 volumes and test DR
• No interruption to storage replicationat any point
• Gone are the days of 4- to 5-day engagements with your DR hardware provider!!!
Site 1 Site 2
J 2
H 1 H 2
Flash Copy
Global Copy
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HelpSystems Corporate Overview. All rights reserved.
• Pros– All data is copied from source to target as this is disk mirroring– No overhead on the operating system; this is completely transparent to IBM i– Choice of synchronous and asynchronous replication– Full system and/or IASP replication can be configured– Simple configuration on storage– Minimal amount of monitoring required
• Cons– The target LPAR cannot be active if full system replication is being used– Remote mirroring license required on most storage systems– Knowledge of storage subsystem required for initial configuration
• Comments– Replication over IP or fibre– Becoming increasingly popular– Journaling not required but is recommended
Storage-based mirroring
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HelpSystems Corporate Overview. All rights reserved.
Logical replication
Geographic mirroring
Storage-based replication
Source and target active at all times
Y Y* N
Journaling mandatory Y N NOverhead on IBM i OS Y Y NAll objects replicated N Y YPowerHA required N Y NTarget is a clone of the source
N Y Y
Target can be used for backups
Y Y** Y***
Requires IASP N Y N
*Only SYSBAS is active on both source and target ** Only if replication is stopped*** Requires use of FlashCopy snapshots
Summary of options
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Which option is best for me?
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HelpSystems Corporate Overview. All rights reserved.
• Assess each LPAR on a needs basis
• A combination of both logical and storage replication may be the best fit
• There is no right or wrong answer
Which option is best for me?
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HelpSystems Corporate Overview. All rights reserved.
• Does my LPAR require 24/7 availability?– Use logical replication
• Do I require the source and target LPAR active at all times?– Use logical replication
• Do I want to run my production LPAR backups on another LPAR?– You can use both logical replication and storage replication
• Do I need simplified replication for my LPAR?– Use storage-based replication
Questions to ask
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• FlashCopy backups using storage software
• FlashCopy within VIOS shared storage pools
• BRMS integration with FlashCopy
• Clone LPARs in seconds
• Share IASPs without a PowerHA license
Other ideas to consider
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HelpSystems Corporate Overview. All rights reserved.
• IBM i Advanced Copy Services– http://tinyurl.com/o5t4k8b– Full System Replication for SVC and Storwize
Provides IBM i commands to configure and manage remote mirroring– Full System Copy Services Manger
IBM i commands to create a snapshot of an LPAR and back up to tape on another LPAR
Provides the capability to quiesce SYSBAS instead of having to power down the LPAR
» No interruption to the users– BRMS integration
BRMS can be used to backup an LPAR clone but update the BRMS database on the source LPAR
IBM Lab Services offerings
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About HelpSystems
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Solutions portfolio
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HelpSystems Corporate Overview. All rights reserved.
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Template approach
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Q&A and recap
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HelpSystems Corporate Overview. All rights reserved.
• What is high availability?• Current options• Which method is best?• Additional resources
Q&A and recap
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HelpSystems Corporate Overview. All rights reserved.
Contact Us
Website:www.helpsystems.com/halcyon
Ash GiddingsProduct Manager
Glenn RobinsonPower Systems Architect
Telephone:800-328-100+44 (0) 1733 234995