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Exam NS0-194 topic 1 question 44 discussion

Actual exam question from Netapp's NS0-194

Question #: 44
Topic #: 1

[All NS0-194 Questions]

Several clients are accessing an ONTAP SnapMirror DP destination volume. Some clients frequently access the newest SnapMirror volume data. Accessing this data is much slower when compared to clients that directly access data on the source. You use the wafl scan status command against the destination.
What is a symptom of the problem in this scenario?

A. blocks used summary update
B. active bitmap rearrangement
C. container block reclamation
D. volume deswizzling

Show Suggested Answer

Suggested Answer: A 🗳️
Reference:
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/What_is_the_"wafl_scan_status"_command%3F

by RjayC at June 13, 2022, 1:58 a.m.

Comments

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MiguelXco

2 weeks, 4 days ago

Selected Answer: D

https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/What_is_deswizzler_or_deswizzling

upvoted 1 times

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Rob89435

1 year, 5 months ago

Selected Answer: D

deswizzling: On Data ONTAP 7-mode and ONTAP 9 DP style SnapMirror destination volumes, this scan maps aggregate (physical) block locations to the volume block location, as the transfer does not include the physical disk block location.

upvoted 1 times

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MarkoG

1 year, 11 months ago

Selected Answer: A

https://community.netapp.com/t5/ONTAP-Discussions/Disks-always-busy-WAFL-scans-neverending/td-p/106978

upvoted 1 times

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RjayC

2 years ago

Selected Answer: D

From reading all the possible answers only D: volume deswizzling made sense. How does this affect performance? Deswizzling scans are minimal overhead on CPU and disk singularly. Multiple scans might cause CPU or disk contention, but this is rare. If a block is read from a user/host and is swizzled (deswizzle scan has not updated this block yet), there is a slight read latency increase and extra overhead. The read does a slow path. Answer D:

upvoted 2 times

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