On Fri, Feb 26, 2010 at 6:23 AM, Piergiorgio Sartor <piergiorgio.sartor@xxxxxxxx> wrote: > Hi all, > > checking randomly the component of some RAID-10 arrays > (two disks each), with "mdadm -E /dev/sdXY", I noticed > the following. > > There is an entry reported, called "Device Role". > > On one array, the components are defined, respectively, as: > > Active device 0 > Active device 1 > > On another two arrays, it's a bit different. > > Active device 0 > spare > > Why is it "spare" (all are RAID-10 f2)? > > Does it make any difference one or the other role, in > this type of RAID? > > On the other hand, "mdadm -D /dev/mdX" does not seem > to give any hint on the different roles. > > Thanks, > > bye, > > -- > > piergiorgio > -- > 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 > Spare should mean that it is not currently a synced member of the array; in other words a hot-spare. As I recall raid10 cannot currently be grown (or /may/ only be grown with VERY recent tools+kernels); did you maybe create a single device raid10 and try to grow it? -- 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
