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Dell EMC Exam D-XTR-OE-A-24 Topic 3 Question 11 Discussion
Topic #: 3
Refer to the exhibit.
Refer to the Exhibit.
An XtremlO administrator is asked to provide a copy of a 25 TiB database to a
group of users. Each user needs to have their own copy of the database in order to
perform a variety of manipulations on the dat
a. This process needs to be repeated
every day of the week. The administrator is concerned about the time it will take to
make the initial copy of the database and is investigating the use of snapshots of
snapshots.
How does each snapshot impact its ancestor?
XtremIO uses a Copy-On-Write (COFW) mechanism for snapshots. When a write is performed on a snapshot, the system checks if the data block being written to has been previously written. If it has not, it copies the original data block (from the ancestor snapshot or volume) to a new location before writing the new data to ensure data consistency. This operation only happens once per block for each snapshot, thereby minimizing the performance impact.
Dell's detailed explanation of the XtremIO snapshot functionality emphasizes the efficiency of their COFW mechanism, ensuring minimal performance degradation when creating and writing to snapshots.
XtremIO documentation highlights how snapshots are managed with in-memory metadata, which supports fast creation and access without substantial performance penalties.
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