On Wed, Aug 01, 2007 at 04:19:59PM -0400, Phillip Susi wrote:
I am investigating a bug report involving the combination of lvm and
dmraid, and it seems to me that the problem is that lvm is detecting the
underlying partition on the primary disk and accessing it directly
rather than going through the raid device made by dmraid. I think that
the problem is there is no facility for dmraid to "claim" the physical
disk so that lvm does not look at it, and also to have lvm scan the raid
device for physical volumes.
Does anyone have any thoughts on how this might be accomplished?
Two things come to mind
1) dmraid should use ioctl BLKPG_DEL_PARTITION, to clean up any eventual
partition table on component devices
2) lvm tool filter could be modified to check if a device has been
already claimed by device-mapper.
something along the lines of:
ioctl DM_LIST_DEVICES
while (...)
ioctl DM_TABLE_DEPS
the above would probably require a cache.
i believe that manual use of partx or lvm filters is sub-optimal
L.
--
Luca Berra -- bluca@comedia.it
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