On Mon, 15 Sep 2014 17:12:52 +0000 Andy Smith <andy@xxxxxxxxxxxxxx> wrote: > Hi Neil, > > On Mon, Sep 15, 2014 at 05:00:37PM +1000, NeilBrown wrote: > > On Mon, 15 Sep 2014 06:47:41 +0000 Andy Smith <andy@xxxxxxxxxxxxxx> wrote: > > > The thing is, that bug report is quite old and is marked closed, and > > > also states: > > > > > > "The problem is that 0.9x metadata block doesn't have enough > > > info to check it. With 1.x we have no such problem." > > > > > > Of course, it *is* 1.x superblock. Did the poster actually mean to > > > say that they have no problem with v1.1 and v1.2 (because they are > > > located at or near the beginning of the device, not at the end)? > > > > 0.90 has the problem, 1.x doesn't. > > Right. > > > Maybe there is an old 0.90 superblock confusing things. It lives in a > > different location than the others and so there is room for confusion. > > I think that must be it. > > > mdadm --examine --metadata=0.90 /dev/sda3 > > > > which show you the 0.90 metadata if there is any. > > /dev/sda3: > Magic : a92b4efc > Version : 0.90.01 > UUID : 3905b303:ca604b72:be5949c4:ab051b7a > Creation Time : Sun Jun 4 08:18:58 2006 > Raid Level : raid10 > Used Dev Size : 309363264 (295.03 GiB 316.79 GB) > Array Size : 928089792 (885.10 GiB 950.36 GB) > Raid Devices : 6 > Total Devices : 6 > Preferred Minor : 2 > > Update Time : Sun Aug 24 14:26:50 2014 > State : clean > Active Devices : 6 > Working Devices : 6 > Failed Devices : 0 > Spare Devices : 0 > Checksum : e613d577 - correct > Events : 312149996 > > Layout : near=2 > Chunk Size : 64K > > Number Major Minor RaidDevice State > this 5 8 3 5 active sync /dev/sda3 > > 0 0 8 51 0 active sync /dev/sdd3 > 1 1 8 67 1 active sync > 2 2 8 83 2 active sync > 3 3 8 19 3 active sync /dev/sdb3 > 4 4 8 35 4 active sync /dev/sdc3 > 5 5 8 3 5 active sync /dev/sda3 > > This shows the array when it had 6 devices as well, so clearly from > before the metadata update and shrink to 4 devices. > > > mdadm --zero-super --metadata=0.90 /dev/sda3 > > > > will remove any 0.90 metadata. > > Trying that whole the array is running: > > mdadm: Couldn't open /dev/sda3 for write - not zeroing > > This needs to be done with the array stopped, presumably? It's preferred, but if you are really confident (and I think you are), then adding --force is justified and should make it work. NeilBrown > > Thanks for the explanation! > > Cheers, > Andy > -- > 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
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