Exam 1z0-820 topic 1 question 31 discussion

Actual exam question from Oracle's 1z0-820

Question #: 31
Topic #: 1

View the exhibit to inspect the file system configuration on your server.

You department's backup policy is to perform a full backup to a remote system disk on Saturday.
On each weekday, you are to perform an incremental backup to the same remote system disk.
Each incremental backup will contain only data that has been modified since the previous Saturday backup.
The server file systems must remain available at all times and can never be taken offline.
The backup must not only provide for the recovery of the most recent version of a file, but must also allow recovery of previous versions of a file.
Following your company policy, which two describe the correct procedure to be performed on each weekday for backing up the /data file system to a remote disk named /remote/backup?

A. Remove the previous daily snapshot. zfs snapshot pool1/data@daily zfs send - i pool1/data@sat pool1/data@daily > /remote/backup/full
B. Remove the previous daily snapshot. zfs snapshot pool1/data@daily zfs send - i pool1/data#sat pool1/data@daily | zfs recv remote /backup/ date +%m%d%
C. Remove the previous daily snapshot. zfs snapshot pool1/data@daily zfs send - i pool1/data@sat pool1/data@daily > /remote/backup/daily
D. Remove the previous daily snapshot. zfs create - i pool1/data@sat pool1/data@daily zfs send pool1/data@daily | zfs remote/backup

Show Suggested Answer

Suggested Answer: BC 🗳️
You can use the zfs send command to send a copy of a snapshot stream and receive the snapshot stream in another pool on the same system or in another pool on a different system that is used to store backup data.
You can send incremental data by using the zfs send -i option.
For example:
host1# zfs send -i tank/dana@snap1 tank/dana@snap2 | zfs recv newtank/dana
Note that the first argument (snap1) is the earlier snapshot and the second argument (snap2) is the later snapshot. In this case, the newtank/dana file system must already exist for the incremental receive to be successful.
The incremental snap1 source can be specified as the last component of the snapshot name. This shortcut means you only have to specify the name after the @ sign for snap1, which is assumed to be from the same file system as snap2. For example: host1# zfs send -i snap1 tank/dana@snap2 > zfs recv newtank/dana
This shortcut syntax is equivalent to the incremental syntax in the preceding example.
Reference: Oracle Solaris ZFS Administration Guide, Sending and Receiving ZFS Data

by f104pilot at Feb. 22, 2022, 3:01 p.m.

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f104pilot

3 years, 5 months ago

Selected Answer: B

Option C or any other options do not provide any way for recovering previous "versions" of data. Only option B does. Hence, it is my opinion that this question only has a single answer , option B

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