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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?

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ComputazionaliArchiviazione
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Provisioning di LinuxAmazon Elastic Block Store
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English
CLKsoft
posta 2 anni fa318 visualizzazioni
1 Risposta
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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.

https://aws.amazon.com/blogs/storage/automating-amazon-ebs-snapshots-management-using-data-lifecycle-manager/

https://aws.amazon.com/blogs/storage/taking-crash-consistent-snapshots-across-multiple-amazon-ebs-volumes-on-an-amazon-ec2-instance/

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rePostfanclub
con risposta 2 anni fa
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ESPERTO
Brettski-AWS
verificato 2 anni fa
  • theist
    2 anni fa

    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 sync before live snapshotting the volume.

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