I have been using linux software RAID block devices as my files for my UML
hosts. Instead of using
linux ubd0=file.fs
I use
linux ubd0=/dev/md0
The performance increase is outstanding, but I have run into one small
snag. I am trying to migrate over to using COW files on a fresh server,
but I cant figure out how to use block devices instead of files. I have
tried a couple of things.
mount /dev/md0 as /mnt/backing/ and put a backing file (rootfs.ro)in that
dir.
the dir is mounted readonly and then I try to start a UML like this
linux ubd0=/dev/md1,/mnt/backing/rootfs.ro
I've tried creating the backing file on the md0 device itself and tried
starting a UML like this
linux ubd0=/dev/md1,/dev/md0 (remembering md0 is my backing "file")
Neither of these seem to work, just get a kernel panic about not being
able to find a rootfs. THe backing file will boot on its own as will the
md0 device, but I cant seem to get the cow file relationship working. Any
thoughts or am I just wasting time?
--
Jason
The place where you made your stand never mattered. Only that you were there..
And still on your feet.
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