--- Dwaine Garden <dwainegarden(a)rogers.com> wrote:
Upgrading to kernel 2.6.16-2088 and I'm getting the
following error when booting.
device-mapper: dm-stripe: Target length not
divisible
by chunk size.
device-mapper: error adding target to table.
There was a patch submitted to 2.6.16, that limits
dm-stripe to targets that are multiples of the chunk
size.
[PATCH] dm stripe: Fix bounds
The dm-stripe target currently does not enforce that
the size of a stripe
device be a multiple of the chunk-size. Under
certain
conditions, this can
lead to I/O requests going off the end of an
underlying device. This
test-case shows one example.
echo "0 100 linear /dev/hdb1 0" | dmsetup create
linear0
echo "0 100 linear /dev/hdb1 100" | dmsetup create
linear1
echo "0 200 striped 2 32 /dev/mapper/linear0 0
/dev/mapper/linear1 0" | \
dmsetup create stripe0
dd if=/dev/zero of=/dev/mapper/stripe0 bs=1k
This will produce the output:
dd: writing '/dev/mapper/stripe0': Input/output
error
97+0 records in
96+0 records out
And in the kernel log will be:
attempt to access beyond end of device
dm-0: rw=0, want=104, limit=100
The patch will check that the table size is a
multiple
of the stripe
chunk-size when the table is created, which will
prevent the above striped
device from being created.
This should not affect tools like LVM or EVMS, since
in all the cases I can
think of, striped devices are always created with
the
sizes being a
multiple of the chunk-size.
The size of a stripe device must be a multiple of
its
chunk-size.
(akpm: that typecast is quite gratuitous)
Signed-off-by: Kevin Corry <kevcorry(a)us.ibm.com>
Signed-off-by: Alasdair G Kergon <agk(a)redhat.com>
Signed-off-by: Andrew Morton <akpm(a)osdl.org>
Signed-off-by: Linus Torvalds <torvalds(a)osdl.org>
I have tried setting the bios chunck size to 64, 32,
16k and re-installed from the DVD. I used both
FC5T3
and FC5 install DVD. I have tried 8 times with
re-installs. It would seem that a computer with
dm-stripe can not be further upgraded because of the
patch which was submitted to 2.6.16 kernel. The
patch
is perfectly good, to fix a problem.
How do you fix the stripe so it is a multiple of
chunk-size? If we can not fix it manually, we
should
notify people not to use dmraid with Bios software
raid.
I'm going to submit a bug report for this.
dmsetup status
via_ecfdfiehfa: 0 312499998 striped
VolGroup00-LogVol01: 0 4063232 linear
VolGroup00-LogVol00: 0 308150272 linear
via_ecfdfiehfap2: 0 312287535 linear
via_ecfdfiehfap1: 0 208782 linear
*** Active Set
name : via_ecfdfiehfa
size : 312499998
stride : 128
type : stripe
status : ok
subsets: 0
devs : 2
spares : 0
--
fedora-test-list mailing list
fedora-test-list(a)redhat.com
To unsubscribe:
https://www.redhat.com/mailman/listinfo/fedora-test-list
I have submitted a bug report for the people
interested.
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=186842
Dwaine