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xen-devel
Re: [Xen-devel] [PATCH] [XM-TEST] block device write verify test 2nd att
On Tue, 2006-05-23 at 12:40 +0100, Ewan Mellor wrote:
> On Tue, May 23, 2006 at 11:35:55AM +0100, Harry Butterworth wrote:
>
> > The only difference from the last version of the patch is that the minor
> > version number in configure.ac is incremented.
> >
> > >From the patch:
> >
> > +# This test imports a ram disk device as a physical device into a domU.
> > +# The domU initialises the ram disk with data from /dev/urandom and
> > calculates
> > +# the md5 checksum of the data (using tee as it is written so as to
> > avoid
> > +# reading it back from the device which might potentially mask
> > problems).
> > +# The domU is stopped and the md5 checksum of the data on the device is
> > +# calculated by dom0. The test succeeds if the checksums match,
> > indicating
> > +# that all the data written by domU was sucessfully committed to the
> > device.
> > +
> >
> > This patch also enables tee and fancy head in busybox on the ramdisk. I
> > have tested the patch with both `make existing' where the tests run but
> > the new test fails because the ramdisk is missing tee and fancy head and
> > `make` where the test passes successfully.
>
> Why don't you use dd instead of head -c?
I tried using dd with a block size of 1 and a count of the right number
of bytes but the test was very slow. I didn't want to assume a 512b
block size and I'm not very good at shell script so didn't manage to
work out how to do it better.
> Why don't you just fix the size of the datablock that you write to the
> ramdisk, instead of determining the current size of the ramdisk with cat
> /dev/hda1 | wc -c?
I wanted to test writing at the device limits. Sometimes there are off
by one errors that mean you can't write the last sector of a block
device.
cat | wc -c was the most robust way I could think of for getting the
size.
>
> Ewan.
>
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