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  1. #1
    Just Joined!
    Join Date
    Apr 2012
    Virginia USA

    Question About the neccesity of a File System atop an LV

    I just started using LVM a month or 2 ago when I was learning Xen Cloud Platform and love how flexible it is. I recently built my self a Fedora Desktop seperate from my VM server. When I was playing around with mounting a raid array to Fedora I relized that I could mount an LV directly without creating a file system on top of it. I was suprised as I though LV's were sort of like super partitions and not really a FS.

    I started using the LV I created without an additional FS like ext4 and have had not issues or slow writes (that I can tell) but everyone says "You must then create a file system" after you make an LV before you mount it.

    Why can I mount an LV directly and use it without a FS? Is LVM a type of FS? Are there any drawbacks or dangers in using LVM this way?

  2. #2
    Linux Guru Rubberman's Avatar
    Join Date
    Apr 2009
    I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away.
    Maybe you can, but I've never run an LVM without a higher-level file system on top. One reason is that modern file systems (ext3, ext4, et al) can do recovery. I don't know of an fsck file system recovery tool for a raw LVM volume... IE, if your system crashes (kernel panic, or whatever), then you may be SOL.
    Sometimes, real fast is almost as good as real time.
    Just remember, Semper Gumbi - always be flexible!

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