Time
4 hours 6 minutes
Difficulty
Beginner
CEU/CPE
4

Video Transcription

00:00
how Ashley s. L. A's can impact your application.
00:04
Any system can experience a failure.
00:08
Hardware breaks networking, have transient failures, and software has bugs and or crashes.
00:15
Even with the older redundancy built in tow, Azur Service's and sometimes whole regions can experience a disruption
00:24
amongst the many things you need to think about when designing your application is also its reliability.
00:30
Knowing your application requirements, you can make more informed decisions what the actual service is to use to achieve your application performance goals.
00:39
Using actual S. L. A's in your application architecture, you can build your own application as a lace
00:46
that you can provide your customer. Sweet
00:49
resiliency is the ability of a system to recover from failure. The go is not to avoid failures but to be able to respond to failures and avoid downtime or data loss.
01:00
Important commandment. Components of resiliency are higher of our ability and disaster recovery.
01:07
When designing your application, you should design for resiliency.
01:11
One of the common traps application designers for in tow is to maximize the viability by implementing measures to prevent application failures.
01:19
The problem with this is that implementing preventive measures can be difficult and expensive
01:26
preventive measures also complicate the systems.
01:30
Increased the viability. Always. Rizu results in increased complexity, which results in higher costs. Knowing the other ability requirements for your application will determine how you handle the additional complexity.
01:46
A few things to consider when designing your application is the lace are
01:49
the level of automation built in your application? If you your application requires menu intervention and has no built in self healing capabilities, achieving high S L. A's will be difficult.
02:04
SL is higher than three. Nights are hard to achieve. You need to make sure that the effort wants the return on investment.
02:10
The smaller the time window for your performance targets, the lower it is to the tolerance you need to consider.
02:19
Do not use hourly or daily up time in your s a lace because of smile. Failure can throw off your metrics,
02:28
he discards. You can approach the calculation of your application is the lace.
02:32
Let's assume that you have a single VM that stores data into Cosmos Debate.
02:38
The S L. A. For the VM is 99.9% while the S L. A. For the Cosmos D. B is five nines.
02:46
The composite S L. A for that system is 99.9% times 99.999 or 99.89 9
02:57
and something which is lower than the SL is for both participating service's.
03:02
This is understandable.
03:05
If this is not satisfactory for your application, you can, of course, improve it by adding a secondary bm
03:12
the probability of simultaneous failure of both. The EMS is 0.1 time 0.1 or 0.1%
03:24
The S L A. For the Simo tennis running the EMS is six nines, which, while the combined S L. A for the system is a 99.9989%.
03:37
This is much closer to the S L. A. For the most reliable component of the system. Because mostly be, however not is that the complexity and the cost of the system has increased with the addition off another VM that will require maintenance and incur additional costs.
03:53
Now you are aware how Asher s a lace come impact your application essay lace and how you can combine service is to improve those

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