Which command extends the logical volume /dev/battlestar/galactica by +20G?

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Multiple Choice

Which command extends the logical volume /dev/battlestar/galactica by +20G?

Explanation:
Extending a logical volume by a specific amount uses a plus sign to indicate an increase. The command lvextend -L +20G /dev/battlestar/galactica takes the current size of the LV and adds 20G to it, giving you a larger volume without guessing a new total size. If you instead used -L 20G, you’d be setting the LV to exactly 20G in total, which could shrink it if it was already bigger. Using -L -20G would shrink the LV by 20G, not extend it. While lvresize can also extend with +20G, using lvextend with the incremental form is the standard way to grow a logical volume in this context. After extending the LV, don’t forget to grow the filesystem to use the new space (specific command depends on the filesystem in use).

Extending a logical volume by a specific amount uses a plus sign to indicate an increase. The command lvextend -L +20G /dev/battlestar/galactica takes the current size of the LV and adds 20G to it, giving you a larger volume without guessing a new total size. If you instead used -L 20G, you’d be setting the LV to exactly 20G in total, which could shrink it if it was already bigger. Using -L -20G would shrink the LV by 20G, not extend it. While lvresize can also extend with +20G, using lvextend with the incremental form is the standard way to grow a logical volume in this context. After extending the LV, don’t forget to grow the filesystem to use the new space (specific command depends on the filesystem in use).

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