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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 ...
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- 04-27-2012 #1
- Join Date
- Apr 2012
- Virginia USA
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?
- 05-02-2012 #2
- Join Date
- Apr 2009
- I can be found either 40 miles west of 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!