For those installing the Fedora 15 Alpha into a VM, just a quick note — virt-manager currently defaults to 512MB of RAM for its VMs. This isn’t enough RAM to boot the Alpha installer.
[11:37:59] <wwoods> F15 will need at least 640MB
[11:38:02] <wwoods> maybe 768
[11:38:42] <wwoods> I have a fix for that in the works but it’s kind of invasive and may not be ready ’til F16
Symptoms of trying to boot with too little memory may include a kernel oops when installing the rootfs. Hope this helps people avoid head scratching later :-).
The Ramblings 
Can you please elaborate more on the *huge* memory requirements? Is it anaconda or some other component that changed? What will the min requirements be for non-VM hardware? For me this is clearly a regression even though I have hopes that at least upgrades will be still possible on older hardware.
I’m afraid I don’t know the details. You could ask Will Woods for more information.
Have you filed a bug report against virt-manager? Would have been easier to fix the problem than a blog about it.
Will said that once he had a better idea of whether increased memory requirements would be a permanent problem in F15 (as opposed to being able to fix it in time for release) he’d ask that a profile for Linux – Fedora 15 be made that defaulted to more memory.
Last time it was lvm mlock()ing several megabytes of translations, exhausting memory. I wonder what’s the offender this time.
Anyway, 1GB of memory is really a minimum in 2011.