In the past I used to test with RAM-disks, provided by /dev/ram*. Gluster uses extended attributes on the filesystem, that makes is not possible to use tmpfs. While thinking about improving some of the GlusterFS regression tests, I noticed that Fedora 20 (and possibly earlier versions too) does not provide the /dev/ram* devices anymore. I could not find the needed kernel module quickly, so I decided to look into the newer zram module.
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