Hi Martin, On Sun, Sep 15, 2013 at 9:46 PM, Martin Wilck <mwilck@xxxxxxxx> wrote: > On 09/15/2013 02:52 PM, Francis Moreau wrote: >> Hello Martin, >> >> On Sat, Sep 14, 2013 at 10:11 PM, Martin Wilck <mwilck@xxxxxxxx> wrote: >>> On 09/14/2013 05:25 PM, Francis Moreau wrote: >> >> [...] >> >>>>>> >>>>>> which looks even weirder: "loop1[2]" indicates that the disk is a >>>>>> spare one whereas "[UU]" tells me the opposite. >>>>>> >>>>>> Could you tell me if I'm wrong in my interpretation or what's going wrong ? >>>> >>>> What about the loop1 in spare and [UU] indicating that loop1 is used ? >>> >>> After you added loop1, the array was in read-auto state. Rebuild doesn't >>> start in this state. >>> >>> When you created the partition table, the array went in active state and >>> was rebuilt. When you looked at mdstat again, the rebuild was already >>> finished. Therefore you got "[UU]" after that. >>> >>> Wrt loop1[2], I think you interpret the [2] wrongly. It seems to be the >>> kernel index of the device somehow. The mdstat parsing code of mdadm >>> doesn't look at this number. If you look at >>> /sys/class/block/md124/md/dev-loop*/slot, the number should be correct - >>> I tried it here. >> >> Well I think I interpreted the numbers the way it's described here : >> >> https://raid.wiki.kernel.org/index.php/Mdstat#md_device_line > > That description is not quite correct. The number in brackets [2] means > the index of the disk in the meta data (for DDF, that's the index in the > "physical disks" table of the container). That number isn't very > meaningful except for the meta data itself. > > The logical disk index is represented by the "slot" attribute in sysfs. > > See e.g. > http://lxr.missinglinkelectronics.com/linux+*/drivers/md/md.h#L79 > > The number displayed in /proc/mdstat is "desc_nr", while the number that > actually matters is "raid_disk". Maybe the description in the wiki is correct but there's a bun in the kernel which displays the wrong number ? If "desc_nr" isn't meaningful, I don't see the point to show it in /proc/mdstat. Thanks -- Francis -- 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
