You have taken a Logical Volume Manager (LVM) snapshot backup of a volume that contains the
MySQL data directory.
Why is it important to remove snapshots after completing a RAW backup in this way?
A.
The system can only support one snapshot per volume, and you need to remove it to be able to
take your next backup.
B.
The snapshot size will continue to grow as changes to the volume are made.
C.
The snapshots take a significant amount of disk space as they are a duplicate copy of the data.
D.
The system keeps a copy of changes in memory and can cause an out of memory event.
Explanation:
Should be B.
I don’t think B, i think should be C
snapshot size will grow only during snapshot taken time if there is any modification done during that time. It won’t continuously grow
Misleading few words from the question question.
If it’s asking about the the initial snapshot taken,
then it will not grow.
If it’s talking about succeeding snapshots, it will.
Leaning towards B as it’s what it likely ask for. 😀
I think B.
MySQL v 5.6 training manual
“Over time, the snapshot’s space requirement tends to grow to the size
of the original volume, which affects performance.” Each initial data change
to blocks on the original volume causes 2 data writes to the vol. group.
B
You should remove snapshot volume when you have finished with them because they take a copy of all data written to the original volume and this can hurt performance.
http://tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html
B