partition

Splitting a btrfs 4.1x root partition with debian live system gparted btrfs tools 3.17-x


This is a short picture log of doing a btrfs 4.1x root partition split on a (down) oracle linux 7.2 using a debian live system applying gparted based on btrfs tools 3.17-x. Lot’s of names and version codecs, right? But this is what matters. The important message is : it works using this flavours.
Actually, running oracle or redhat linux as the live system may have been much more appropriate concerning compatibility reasons. The odd things is, no redhat-based (enterprise) linux system features gparted. Only fedora does, sourcing the epel-repository but not having kinf of a live system release as debian.

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Extending lvm mounts in oracle linux on vmware, part 1: a new disk device


This is part #1 of a two part series about scenarios of extending lvm (logical volume manager 2) mounts in an oel (red hat 7) guest running on vmare. Starting up, the scenario in question is a new disk being added to the guest by behalf of the guest settings in the vsphere client. Following up then, in part #2 (Extending lvm mounts in oracle linux on vmware, part 2: a larger disk partition), an existing disk has been resized, that is extended, touching the underlying disk file in vsphere client. Both scenarios are quite common, where the first one is at all means to be preferred over the second one, because it will not trigger any downtime for the guest os or the guest apps (by a lvm deactivate) running io on the lvm mount and is by far easier to handle. Btw, saying lvm mount does actually mean a dedicated logical volume (on volume groups and physical volumes, you know) mounted to some spot in the directory tree.

Ok then, in short, the first scenario requires the following steps:

  • introduce the new disk to the guest os
  • create a partition on the new disk
  • integrate the new disk into the lvm mount
  • extend the filesystem managed by lvm mount

I’ll give the necessary commands below but will also provide information for verfication purposes. These code boxes will (shall) be closed on page load and will feature an explicit title, indicating an optional step. In this example, I add a second disk to an existing lvm mount of one disk /dev/sdc around 120gb. The new disk is the fourth disk attached to the guest, /dev/sdd perspectively, and has only 16gb for testing.

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