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Casual Articles - SANRAD Application Note: Exchange Disaster Recovery with SANRAD V-Switch Planning Guide
You're sitting there one day, off from work due to the stress of your unsecured debts weighing heavily upon your shoulders. Suddenly, in the background noise from the TV you hear a fantastic deal - consolidate your existing debts into 'one easy affordable loan'. You think wow, just what I need to get my debts under control and you get the sales blurb.Sounds great doesn't it?Debt consolidation in the UK is not a new phenomena these days. It's been around a while. Lots of people have taken out debt busting consolidation loans. So why is the amount of debt in the UK still rising so fast? And why are bankruptcies, IVA's and debt counselling services stretched to their limits and running at all time high figures right now? Well people get sold on the advantages but I'd recommend thinking about the disadvantages too!Adva
For Asynchronous replication, you must decide the data replication frequency. There are three factors that must be considered:
1. The size of the network bandwidth between the sites.
2. The amount of data changes that need to replicate each time. For example, large amounts of data changes take longer to replicate using T1 links.
3. The RPO requirements.
Initial Volume Synchronization
One of the best ways to establish a credit report is to acquire a student credit card. However, there are a few things you should be aware of if you decide on this. One of this is the fact that your credit report will be kept and maintained by credit bureaus. Thus, whenever credit companies want to look up your credit history, they will contact these bureaus for it. Information on your payment patterns and outstanding payments for your student credit card, both good and bad, will be recorded here.Essentially, no one can legally change the contents of that report and everything remains in there for up to a decade. Thus, it is important to maintain a healthy credit report by making payments on time, starting with your student credit card. Having a good credit report has a huge impact on loans and on future applications for other form
Designing a disaster recovery system requires planning and consideration of the available options that will best fit your companys needs, SLA and budget. This guide will help you design an Exchange Disaster Recovery plan in conjunction with SANRAD Replication. The guide assumes that you have basic knowledge of SANRAD V-Switch and Exchange Administration.
Note: It is recommended to read Microsofts Exchange Server 2003 Disaster
Recovery Planning Guide available from
http://www.microsoft.com/downloads/details.aspx?FamilyId=784BBE
A2-28DD-409A-8368-F9914E993B28&displaylang=en.
Exchange Disaster Recovery Planning
This section discusses both general and Exchange specific considerations that need to be addressed when designing a disaster recovery solution combining SANRAD replication and Microsoft Exchange Server.
General Considerations
SANRAD replication solution allows for flexibility with Exchange Disaster Recovery design.
The most influential factors affecting design consideration are:
Budget limitations
Recovery Time Objective (RTO) requirements (the time until the data is back online)
Recovery Point Objective (RPO) requirements (the amount of data that can be lost)
Network bandwidth between the local site and remote site
Replication method: Synchronous versus Asynchronous
Replication frequency (only for Asynchronous replication)
Initial volume synchronization
RTO (Recovery Time Objective)
With high level RTO, duplicate hardware is required to allow quick recovery making
the solution more costly.
RPO (Recovery Point Objective)
RPO requirements are best defined by the amount of data that the company is willing to
lose.
High level RPO requires more bandwidth for both Synchronous and Asynchronous
replication.
Low level RPO requires less frequent replication and increases the risk of losing
more data.
Network Bandwidth between the Local and Remote sites
Bandwidth between the sites is generally the most crucial factor affecting the replication
component of a Disaster Recovery solution.
T1 (1.5Mb) links impose less frequent data replication and the use of asynchronous
replication methods.
T3 (45Mb) links or a 1Gb links allow frequent replication and the flexibility to choose
between synchronous replication or asynchronous replication methods.
Replication method
When considering which replication method to choose it is important to remember:
In Synchronous Replication the I/O commands are written to the local disk and to
the remote volume at the same time. Every IO command requires an
acknowledgment from both the local and remote sites before the next command.
Consequently, synchronous replication is best deployed with a high bandwidth
connection in order to allow the remote acknowledgment to arrive back to the local
site as fast as possible and the replication can run faster.
In Asynchronous Replication the I/O commands are written to the local volume and
local journal volume which in turn is replicated periodically to the remote volume as
periodically defined by the user. Consequently asynchronous replication can work
well with lower bandwidth (minimum recommended for Exchange replication is 1.5
Mb) since both acknowledgements are local (from the primary volume and the journal
volume) and thus the replication is fast by default.
For Asynchronous replication, you must decide the data replication frequency. There
are three factors that must be considered:
1. The size of the network bandwidth between the sites.
2. The amount of data changes that need to replicate each time.
For example, large amounts of data changes take longer to replicate using T1
links.
3. The RPO requirements.
Initial Volume Synchronization<
Your credit is bad. Perhaps you have a string of unpaid bills haunting your past. Maybe you declared bankruptcy within the past 10 years, or defaulted on a student loan.All of the above can block your access to obtaining a major credit card, such as VISA or Mastercard.But bad credit is not the only reason you can be denied a major credit card. Some people simply have never used credit. People who like to pay cash only, have never financed a car, taken out a college loan, or a mortgage may have zero experience with credit. In that case, most card companies will reject your application, not because you have bad credit -- but because you have no credit rating.Many women who marry young and do all their borrowing under their husband's name often find themselves with no credit rating after they are widowed or divorced
General Considerations
SANRAD replication solution allows for flexibility with Exchange Disaster Recovery design.
The most influential factors affecting design consideration are:
Budget limitations
Recovery Time Objective (RTO) requirements (the time until the data is back online)
Recovery Point Objective (RPO) requirements (the amount of data that can be lost)
Network bandwidth between the local site and remote site
Replication method: Synchronous versus Asynchronous
Replication frequency (only for Asynchronous replication)
Initial volume synchronization
RTO (Recovery Time Objective)
With high level RTO, duplicate hardware is required to allow quick recovery making
the solution more costly.
RPO (Recovery Point Objective)
RPO requirements are best defined by the amount of data that the company is willing to
lose.
High level RPO requires more bandwidth for both Synchronous and Asynchronous
replication.
Low level RPO requires less frequent replication and increases the risk of losing
more data.
Network Bandwidth between the Local and Remote sites
Bandwidth between the sites is generally the most crucial factor affecting the replication
component of a Disaster Recovery solution.
T1 (1.5Mb) links impose less frequent data replication and the use of asynchronous
replication methods.
T3 (45Mb) links or a 1Gb links allow frequent replication and the flexibility to choose
between synchronous replication or asynchronous replication methods.
Replication method
When considering which replication method to choose it is important to remember:
In Synchronous Replication the I/O commands are written to the local disk and to
the remote volume at the same time. Every IO command requires an
acknowledgment from both the local and remote sites before the next command.
Consequently, synchronous replication is best deployed with a high bandwidth
connection in order to allow the remote acknowledgment to arrive back to the local
site as fast as possible and the replication can run faster.
In Asynchronous Replication the I/O commands are written to the local volume and
local journal volume which in turn is replicated periodically to the remote volume as
periodically defined by the user. Consequently asynchronous replication can work
well with lower bandwidth (minimum recommended for Exchange replication is 1.5
Mb) since both acknowledgements are local (from the primary volume and the journal
volume) and thus the replication is fast by default.
For Asynchronous replication, you must decide the data replication frequency. There
are three factors that must be considered:
1. The size of the network bandwidth between the sites.
2. The amount of data changes that need to replicate each time.
For example, large amounts of data changes take longer to replicate using T1
links.
3. The RPO requirements.
Initial Volume Synchronization
Have you been searching for low cost health insurance but don't know where to turn? You're not alone, there are now millions of people without health insurance here in the United States. The situation is completely unacceptable as far as I'm concern, however, I'm only one voice and my one voice only carries so far. There are ways that you can lower your health insurance costs, one of which is by raising your annual deductible to a higher level. Let me explain how this works.By raising your annual deductible you'll still have substantial coverage towards any hospitalization costs, but it means that you'll probably be paying the majority of your doctor visits out-of-pocket. Most people only see the doctor once or twice a year and even then, most of the time it's for sickness not injury so you'd be looking at possibly only paying
RPO (Recovery Point Objective)
RPO requirements are best defined by the amount of data that the company is willing to
lose.
High level RPO requires more bandwidth for both Synchronous and Asynchronous
replication.
Low level RPO requires less frequent replication and increases the risk of losing
more data.
Network Bandwidth between the Local and Remote sites
Bandwidth between the sites is generally the most crucial factor affecting the replication
component of a Disaster Recovery solution.
T1 (1.5Mb) links impose less frequent data replication and the use of asynchronous
replication methods.
T3 (45Mb) links or a 1Gb links allow frequent replication and the flexibility to choose
between synchronous replication or asynchronous replication methods.
Replication method
When considering which replication method to choose it is important to remember:
In Synchronous Replication the I/O commands are written to the local disk and to
the remote volume at the same time. Every IO command requires an
acknowledgment from both the local and remote sites before the next command.
Consequently, synchronous replication is best deployed with a high bandwidth
connection in order to allow the remote acknowledgment to arrive back to the local
site as fast as possible and the replication can run faster.
In Asynchronous Replication the I/O commands are written to the local volume and
local journal volume which in turn is replicated periodically to the remote volume as
periodically defined by the user. Consequently asynchronous replication can work
well with lower bandwidth (minimum recommended for Exchange replication is 1.5
Mb) since both acknowledgements are local (from the primary volume and the journal
volume) and thus the replication is fast by default.
For Asynchronous replication, you must decide the data replication frequency. There
are three factors that must be considered:
1. The size of the network bandwidth between the sites.
2. The amount of data changes that need to replicate each time.
For example, large amounts of data changes take longer to replicate using T1
links.
3. The RPO requirements.
Initial Volume Synchronization
Among many things, Donald Trump is a successful businessman and an extremely wealthy individual. Donald Trump is perceived by the mass public as a true corporate King. The question is who are all these people that competed so fiercely against each other during the hour that the Apprentice show was broadcasted and why did they strive to prove their skills so as to secure their position in his empire? One might support that they are the products of America's powerful media networks, the gladiators of our postmodern reality. But are these reality shows we tend to watch ritually, the mirroring of our contemporary culture, or are they the outcome of today's spectators' confusion regarding the prevailing notions of modernity, revolution and self-development?To be a citizen of the modern world, is equivalent to remain open to change and e
Replication method
When considering which replication method to choose it is important to remember:
In Synchronous Replication the I/O commands are written to the local disk and to
the remote volume at the same time. Every IO command requires an
acknowledgment from both the local and remote sites before the next command.
Consequently, synchronous replication is best deployed with a high bandwidth
connection in order to allow the remote acknowledgment to arrive back to the local
site as fast as possible and the replication can run faster.
In Asynchronous Replication the I/O commands are written to the local volume and
local journal volume which in turn is replicated periodically to the remote volume as
periodically defined by the user. Consequently asynchronous replication can work
well with lower bandwidth (minimum recommended for Exchange replication is 1.5
Mb) since both acknowledgements are local (from the primary volume and the journal
volume) and thus the replication is fast by default.
For Asynchronous replication, you must decide the data replication frequency. There
are three factors that must be considered:
1. The size of the network bandwidth between the sites.
2. The amount of data changes that need to replicate each time.
For example, large amounts of data changes take longer to replicate using T1
links.
3. The RPO requirements.
Initial Volume Synchronization
The birthday party supplies you will need for a birthday party can be balloons, decorations, food and many other things. Plan the birthday party for your child around a theme party, it will be liked not only by your kid, but also by all his friends at school.But with the proper party supplies, a little know how and a lot of imagination, you can throw a birthday party that the kids will be talking about all year. It is very important to consult with the birthday boy or girl about the kind of party they would like, as kids or teenagers have their own ideas of what makes a party fun. There are supplies for every kind of theme party.When planning a kids Birthday Party or an adult theme event, it is very important to pay attention to all the details, including, and especially, the birthday party supplies. Birthday party supplies
For Asynchronous replication, you must decide the data replication frequency. There
are three factors that must be considered:
1. The size of the network bandwidth between the sites.
2. The amount of data changes that need to replicate each time.
For example, large amounts of data changes take longer to replicate using T1
links.
3. The RPO requirements.
Initial Volume Synchronization
SANRAD replication solution can be used to protect existing production Exchange data.
SANRAD Disaster Recovery solution supports both online and offline synchronization.
When using SANRAD replication with existing Exchange data, an Initial synchronization
of the Exchange volumes on the local site to the remote site must be performed.
The initial volume sync method depends on:
The size of the volumes needed to be synchronized.
The network bandwidth between the sites. For example, the bigger the volume size,
the longer it will take to synchronize over a T1 link.
Online synchronization starts immediately when replication is started and uses the
same network link that will be used during the replication.
Offline synchronization is a manual process where SANRAD replication prepares the
volumes on the primary site and the user must copy the data to the remote site. It is the
users responsibility to make sure the volumes on the remote site are synchronized.
Exchange Considerations
Any Exchange Disaster Recovery planning should (at the very least) consider the following
requirements:
Quick access to the most recent copy of the Exchange database and the transaction
logs. In a disaster situation SANRAD replication provides fast access to the
replicated data on the remote site.
The Exchange database and its related transaction logs must be replicated together
to the remote site. SANRAD replication uses consistency groups to ensure
simultaneous replication of all volumes assigned to a consistency group.
Exchange is integrated into Active Directory. An Active Directory domain controller
(running Global Catalog) which is part of the same Active Directory domain that
exists in the primary site, must exist in the remote site as well (or at least the
capability to rebuild one and reconnect it to the existing Active Directory Domain).
The most up to date replicated copy of the Windows backup set (which includes
system state) to expedite Exchange Server recovery.
Note: for detailed information about Exchange 2003 disaster recovery considerations
please read Microsofts article, Exchange Server 2003 Disaster Recovery Planning
Guide (http://go.microsoft.com/fwlink/?LinkId=21277).
This guide deals with designing a disaster recovery system while planning and considering the available options. It further discusses about suggested Disaster Recovery Designs, fully Mirrored Remote Site, partially Mirrored Remote Site, small Remote Site, combining SANRAD Disaster Recovery Designs with Exchange Disaster, restore Models, restore Exchange with a Standby Server and restore by Rebuilding Exchange Server.
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