[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

[linux-lvm] Re: LVM on dmraid breakage



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
       Communication Media & Services S.r.l.
/"\
\ /     ASCII RIBBON CAMPAIGN
 X        AGAINST HTML MAIL
/ \


[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]