1Z0-820 practice question 8 of 25

The current ZFS configuration on your server is: pool1200K3.91G31K/pool1 pool1/data31K3.91G31K/data Your backup policy states that you are to perform…

The current ZFS configuration on your server is: pool1200K3.91G31K/pool1 pool1/data31K3.91G31K/data Your backup policy states that you are to perform a full backup of /data on Sunday and incremental backups on Monday through Saturday. Each incremental will back up only the data that has been created or modified since the Sunday backup was started The file systems must be available to users at all times and the data will be backed up to tape. Which option should you choose for the Wednesday backup?

Answer options

A: On Sunday zfs snapshot pool1/data@sunday zfs send pool1/data@sunday > /dev/rmt/0 On Wednesday zfs snapshot pool1/data@wednesday zfs send -i pool1/data@sunday pool1/data@wednesday > /dev/rmt/0 Correct answer

B: On Sunday zfs snapshot pool1/data@sunday > /dev/rmt/0 On Wednesday zfs snapshot -i pool1/data@wednesday >/dev/rmt/0

C: On Sunday zfs snapshot pool1/data@sunday zfs send pool1/data@sunday > /dev/rmt/0 On Wednesday zfs snapshot pool1/data@wednesday zfs send -i pooll/data@wednesday pooll/data@sunday > /dev/rmt/0

D: On Sunday zfs snapshot pool1/data@sunday zfs send pool1/data@sunday > /dev/rmt/0 On Wednesday zfs snapshot pool1/data@wednesday zfs send -i pool1/data@wednesday > /dev/rmt/0

E: On Sunday zfs snapshot pool1/data@sunday zfs send pool1/data@sunday | zfs recv> /dev/rmt/0 On Wednesday zfs snapshot pool1/data@wednesday zfs send -i pool1/data@sunday pool1/data@wednesday|zfs recv > /dev/rmt/0

Correct Answer:

A. On Sunday zfs snapshot pool1/data@sunday zfs send pool1/data@sunday > /dev/rmt/0 On Wednesday zfs snapshot pool1/data@wednesday zfs send -i pool1/data@sunday pool1/data@wednesday > /dev/rmt/0

Explanation

To perform an incremental ZFS backup of data modified since the Sunday full backup, you must use the zfs send -i command. The correct syntax requires specifying the initial snapshot (Sunday) followed by the latest snapshot (Wednesday). Option A correctly creates the Wednesday snapshot and sends the incremental stream (zfs send -i pool1/data@sunday pool1/data@wednesday) directly to the tape device at /dev/rmt/0.

Why Incorrect

B: The syntax zfs snapshot -i is invalid; the -i flag is an option for the zfs send command, not for creating snapshots. C: The order of the snapshots in the zfs send -i command is reversed. The older snapshot must precede the newer snapshot. D: The zfs send -i command is missing the first (older) snapshot argument, which is required to calculate the incremental difference. E: Piping the output to zfs recv is used for receiving a stream into a ZFS dataset, not for writing the raw backup stream to a tape device.

References

- Oracle Corporation. (2012). Oracle Solaris 11.1 Administration: ZFS File Systems (Part No: E28548). Section: "Sending and Receiving Complex ZFS Snapshot Streams".

- Oracle Corporation. (2012). Oracle Solaris 11.1 Administration: ZFS File Systems (Part No: E28548). Section: "Saving ZFS Data to Tape".

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