Unmount Linux File-systems Before Snapshot
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I have an EC2 instance running ubuntu 20. I use several EBS volumes for ext4 file-systems. I want to backup the volumes with snapshots. Is it necessary for the snapshots to be taken while the file-systems are unmounted?
asked 4 months ago9 views
1 Answers
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Accepted Answer
Normally it depends on type of workload running on the Filesystem.
Without unmount, snapshot is crash consistent. Based on workload (e.g. database), quiescing it will give app/db consistent snapshot. Below are some good blogs to manage the snapshot process and crash consistent snapshot.
answered 4 months ago
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asked 2 months agoUnmount Linux File-systems Before Snapshot
Accepted Answerasked 4 months ago
Can be done w/o unmount but, at least in Linux, beware of disk caches. I find some files missing in restored snapshots, Also I found that it is leveraged by issuing a good ol'
sudo syncbefore live snapshotting the volume.