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Dell E20-598

Backup Recovery - Avamar Specialist for Storage Administrators

Verified practice questions with detailed answers, clear explanations, and community discussion.

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Question 1 of 237

Which hash type represents an individual data chunk processed during an EMC Avamar backup?

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Correct answer: A

Exam E20-598: Question 1 - Image 1
Exam E20-598: Question 1 - Image 2 A

Question 2 of 237

For each file that is backed up in an EMC Avamar system, how many total bytes are added to the file cache?

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Correct answer: D

The most important thing to do on a client with so many files is to make sure that the file cache is sized appropriately. The file cache is responsible for the vast majority (>90%) of the performance of the vamar client. If there's a file cache miss, the client has to go and thrash your disk for a while chunking up a file that may already be on the server.
So how to tune the file cache size?
The file cache starts at 22MB in size and doubles in size each time it grows. Each file on a client will use 44 bytes of space in the file cache (two SHA-1 hashes consuming 20 bytes each and 4 bytes of metadata). For 25 million files, the client will generate just over 1GB of cache data. http://jslabonte.blogspot.com/2013/08/avamar-and-large-dataset-with-multiples.html

Question 3 of 237

What are three types of EMC Avamar hashes?

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Correct answer: A

Question 4 of 237

What is used by EMC Avamar to provide system-wide fault tolerance?

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Correct answer: A

Question 5 of 237

The EMC Avamar client needs to backup a file and has performed sticky-byte factoring. This results in the following:

✑ Seven (7) chunks that will compress at 30%

✑ Four (4) that will compress at 23%

✑ Two (2) chunks at 50% compression

How many chunks will be compressed prior to hashing?

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Correct answer: C

vamar, has a rather nifty technology called Sticky Byte Factoring which allows it to identify the changed information inside a file by breaking the file into variable length objects, this leads to much greater efficiency than fixed size approaches as changes made early in a fixed length sequence affect all subsequent blocks/ chunks/objects/whatever in that sequence. This in turn changes all the fingerprints taken following the changed data which means you end up with a lot of new blocks/chunks/objects/whatever even if the data really hasn't changed all that much. Sticky Byte Factoring on the other hand can tell what exactly has changed, not just that things have changed.

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Alisha Kelly
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Honestly, I had already gone through the official documentation quite thoroughly, but still didn't feel fully confident going in. This helped things finally click for me. I realized I knew the material, but just hadn't connected all the pieces yet.
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I don't usually leave reviews, but this one felt worth sharing. The questions were quite close to what actually appeared on the exam, more than I expected. I spent about a week going through the material before my test, and it helped me feel more prepared.
Remi Nuyts
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Passed ITIL 4 Foundation with 87%. Material was enough by itself.
Archie Hopkins
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I had a smooth experience from start to finish. Access was available right away, no technical issues, which made it easy to get started. The content felt relevant and aligned well with what I was looking for.
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Neil Savage
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A very quick response was received via email when a link issue occurred. The study materials provided were high quality and extremely helpful. I was able to complete the test successfully. Many thanks for the excellent support.

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