1 Reply Latest reply on May 14, 2019 12:30 PM by CinciTech

    Possible to Extend Filesystem Across Multiple Virtual Disks?

    CinciTech Enthusiast

      I have a Photon VM deployed, and would like to expand its file system.  Rather than adding multiple disks with their own individual partitions mounted separately, I would like to add the virtual disks and extend the filesystem across the new disks.  I have been able to do this in a different OS using cfdisk, pvcreate, vgextend, lvextend & resize2fs: https://help.univention.com/t/resize-lvm-on-ucs/7491


      In my Photon VM I can create sdb1 using cfdisk, and view the results with lsblk.  The rest of the commands don't exist in Photon (except resize2fs).  I wonder if anyone might have some suggestions on how I can expand the filesystem across newly-added virtual disks?

        • 1. Re: Possible to Extend Filesystem Across Multiple Virtual Disks?
          CinciTech Enthusiast

          I was working through what the response from lsblk is telling me.  Specifically, I see the physical (virtual) volumes sda and sdb, and I see the partitions sda1, sda2, and sdb1.  What I don't see in Photon is the volume groups / logical volume (lvm) that I see from lsblk in Univention.  Presumably no logical volume means no way to expand that logical volume across multiple partitions.  So I'm going to take the relative silence from the community and my observations to mean that Photon simply doesn't support this.  Unless anyone has any additional feedback?


          I realize this is effectively a way to set up JBOD within an operating system, and is not something I'd ever want to do on a physical computer.  But since all my systems run on RAID1 or RAID10 arrays, I get the benefit of JBOD without its inherent inability to tolerate a physical disk failure.  And since I'm looking to use an appliance to replace a Windows VM with VMDK of over 3TB, the ability to expand my disk space by adding virtual disks is attractive because 1TB files are easier to manage than an ever-growing single VMDK.


          Ultimately, I really like how slim and easy-to-manage Photon has been, but I'll have to weigh the benefits of the lightweight OS against its lack of a logical volume.