It looks like dmsetup need to be patched as well. There is a bug opened
up for dmraid because after this
patch, Fedora 5 installs would not boot with kernel 2.6.16. There is a
patch to round down the stripe size to be multiple of the chunk-size, but
the computers still fail trying to boot and mount volumes.
After Heinz patched dmraid, it now fixed. It looks like dmsetup needs to
be patched as well(Or something within device-mapper). Via_ecfdfiehfa is
not a multiple of chunk-size, Both dmraid and dmsetup should match. So
all software raid0 setup with dmraid still fail to boot under 2.6.16+.
Nvidia, Intel and Via chipsets are confirmed impacted, but all the chipsets
which has this software raid0 will have this problem.
dmraid -s
(Size Looks
Good)(New
patched dmraid
rc11-pre1-test
)
*** Active Set
name :
via_ecfdfiehfa
size :
312499968
stride : 128
type :
stripe
status : ok
subsets: 0
devs : 2
spares : 0
dmsetup -table
(Size is bad)
via_ecfdfiehfa
2: 0 312287535
linear 253:0
208845
via_ecfdfiehfa
1: 0 208782
linear 253:0
63
via_ecfdfiehfa
: 0 312499998
striped 2 128
8:0 0 8:16 0
VolGroup00-Log
Vol01: 0
4063232 linear
253:2
308150656
VolGroup00-Log
Vol00: 0
308150272
linear 253:2
384
Here is the
Fedora Bug
report for
interested
people. A
lot of testing
has been
completed.
https://bugzil
la.redhat.com/
bugzilla/show_
bug.cgi?id=186
842
Dwaine
The dm-striped 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 below 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 effect 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.
--
Kevin Corry
kevcorry us ibm com
http://www.ibm.com/linux/
http://evms.sourceforge.net/
The size of a stripe device must be a multiple of its chunk-size.
Signed-off-by: Kevin Corry <kevcorry us ibm com>
dm-stripe.c | 6 ++++++
1 file changed, 6 insertions(+)
--- diff/drivers/md/dm-stripe.c 2006-03-14 15:57:30.000000000
-0600
+++ source/drivers/md/dm-stripe.c 2006-03-14 16:01:41.000000000
-0600
@@ -103,6 +103,12 @@
return -EINVAL;
}
+ if (((uint32_t)ti->len) & (chunk_size - 1)) {
+ ti->error = "dm-stripe: Target length not
divisable by "
+ "chunk size";
+ return -EINVAL;
+ }
+
width = ti->len;
if (sector_div(width, stripes)) {
ti->error = "dm-stripe: Target length not
divisable by "
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