On Thu, Aug 01, 2013 at 11:04:37AM -0600, John Strange wrote: > 1. I'd like to use DM with a new target type. I'm porting our virtualized > storage solution from Windows. I've been able to register my target and > get callbacks working, but in looking at the dm-raid code, I'm concerned > with how tightly coupled it is with the routines in md.c (multiple devices > implementation). Is there an expectation that a DM target use the md_xxxx > routines? If you need that sort of raid functionality, then yes (and you should look into using the external metadata support if you have a new format). > 2. I used dmsetup to create a mapping for a device that my target > controls. Is there a way to make the underlying device (e.g. /dev/sdb) not > visible to the system? No and this is by design: all layers of the device stack are addressable from userspace. > I'm paranoid about external accesses to a LUN that > I'm using. Utilities should detect the device is in use. Alasdair -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
