Re: [PATCH] qemu: use statically allocate 512 byte buffer in the stack for sector in bdrv_commit

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Javier Guerra wrote:
> to test a cluster filesystem, i need two (virtual) machines with some
> shared storage.  i tried long ago something like this (with (k)qemu):
>
> - create a disk image, call it hda-1.img
> - boot and install linux on it, shutdown
> - copy to hda-2.img
> - boot it (with new MAC) and change IP, hostname, little things, shutdown
> - boot both with the same bridge, check that network works between them
> - create a new disk image, call id hdb-shr.img
> - boot both VMs, sharing hdb-shr.img:
>
> qemu -hda=hda-1.img -hdb-shr.img
> qemu -hda=hda-2.img -hdb-shr.img
>
> - try to setup a cluster filesystem on hdb
>
> it almost worked... but some writes didn't propagate to the other
> until some extra writes to hdb; so i guessed that each qemu instance
> had some caching on file I/O
>
> hopefully, it would now work with "-cache=off", don't you think?
>   
>

cache=off is not necessary.  However you need raw format images (not 
qcow/vmdk/etc).


-- 
error compiling committee.c: too many arguments to function


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