On 04/12/2014 01:43 AM, NeilBrown wrote: > On Fri, 11 Apr 2014 13:01:49 +0200 Francis Moreau <francis.moro@xxxxxxxxx> > wrote: > >> Hello, >> >> I'm writing a tool that relies udev lib in order to manage block >> devices connected to my computer. >> >> One thing that I need is to retrieve disks contained by a RAID array. >> >> The current usefull information exported by udev are, for example: >> >> MD_DEVICES=3 >> MD_DEVICE_loop0p1_DEV=/dev/loop0p1 >> MD_DEVICE_loop0p1_ROLE=0 >> MD_DEVICE_loop1p1_DEV=/dev/loop1p1 >> MD_DEVICE_loop1p1_ROLE=1 >> MD_DEVICE_loop2p1_DEV=/dev/loop2p1 >> MD_DEVICE_loop2p1_ROLE=2 >> >> but this is not really easy to exploit since I need to know the disk >> names in order to poke the devices used by the array :-/ >> >> why not simply using ? >> >> MD_DEVICE_DEV_1=/dev/loop0p1 >> MD_DEVICE_ROLE_1=0 >> > > What number would I use for spare devices? > Certainly something like this could be done, but it wasn't. > > Maybe what you are really asking is: > > "Could we please have another record which lists all the devices, e.g. > MD_DEVICE_LIST=loop0p1 loop1p1 loop2p1 > ??" > Yes please, that's what I was asking for: there's currently no easy way to retrieve the list of disks that is part of an array. Currently we have: MD_DEVICE_loop0p1_DEV=/dev/loop0p1 The name of the property involves the value of the property. > Obviously you can extract that from the output above, but it might be easier > to have it explicitly. Yes I can but it's not very convenient. > > Would that meet your need, or have I misunderstood you completely? > Yes, it would. Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
