B.14.6. DRBD and LVM

In the following section, we provide answers to questions that are most frequently asked about DRBD and LVM.

Questions

  • B.14.6.1: Can I use DRBD on top of LVM?

  • B.14.6.2: Can I use LVM on top of DRBD?

  • B.14.6.3: Can I use DRBD on top of LVM while at the same time running LVM on top of that DRBD?

Questions and Answers

B.14.6.1: Can I use DRBD on top of LVM?

Yes, DRBD supports on-line resizing. If you enlarge your logical volume that acts as a backing device for DRBD, you can enlarge DRBD itself too, and of course your file system if it supports resizing.

B.14.6.2: Can I use LVM on top of DRBD?

Yes, you can use DRBD as a Physical Volume (PV) for LVM. Depending on the default LVM configuration shipped with your distribution, you may need to add the /dev/drbd* device files to the filter option in your lvm.conf so LVM scans your DRBDs for PV signatures.

B.14.6.3: Can I use DRBD on top of LVM while at the same time running LVM on top of that DRBD?

This requires careful tuning of your LVM configuration to avoid duplicate PV scans, but yes, it is possible.

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