Hi If i can give my thoughts I like the idea of having a MD device list But I also think the francis's idea is good and for the spare you could enumerate with letter ? we could get : MD_DEVICES=4 MD_DEVICE_LIST=loop0p1 loop1p1 loop2p1 loop3p1 MD_DEVICE_DEV_1=/dev/loop0p1 MD_DEVICE_ROLE_1=0 MD_DEVICE_DEV_2=/dev/loop1p1 MD_DEVICE_ROLE_2=1 MD_DEVICE_DEV_3=/dev/loop2p1 MD_DEVICE_ROLE_3=2 MD_DEVICE_DEV_A=/dev/loop3p1 MD_DEVICE_ROLE_A=spare like that it's really easy to parse what ever you need :-) or maybe just continue normal increment since we have the role... On Sat, Apr 12, 2014 at 4:22 AM, Francis Moreau <francis.moro@xxxxxxxxx> wrote: > 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 -- 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
