Yi Zhang <yizhan@xxxxxxxxxx> writes: > Hi Neil > > When testing 00raid1, found the md127 auto created when use "-B" to build a legacy array without superblocks, is it reasonable? This happens because udev notices a new device has appeared, looks inside it, sees that it could be part of an md array, and so runs "mdadm --incremental" on it. Sometimes we want udev to do that. Sometimes we don't. There is no easy way for udev to know what we want. NeilBrown > pls check below detailed info: > > + mdadm -CR /dev/md0 --level=raid1 -n3 /dev/loop0 /dev/loop1 /dev/loop2 > mdadm: /dev/loop0 appears to contain an ext2fs file system > size=58368K mtime=Thu Jan 1 08:00:00 1970 > mdadm: Note: this array has metadata at the start and > may not be suitable as a boot device. If you plan to > store '/boot' on this device please ensure that > your boot-loader understands md/v1.x metadata, or use > --metadata=0.90 > mdadm: /dev/loop1 appears to contain an ext2fs file system > size=38912K mtime=Thu Jan 1 08:00:00 1970 > mdadm: Defaulting to version 1.2 metadata > mdadm: array /dev/md0 started. > + mdadm --wait /dev/md0 > + cat /proc/mdstat > Personalities : [raid6] [raid5] [raid4] [raid1] > md0 : active raid1 loop2[2] loop1[1] loop0[0] > 19968 blocks super 1.2 [3/3] [UUU] > > unused devices: <none> > + mdadm -S /dev/md0 > mdadm: stopped /dev/md0 > + mdadm -B /dev/md0 -l raid1 -n2 /dev/loop0 /dev/loop1 > mdadm: array /dev/md0 built and started. > + sleep 2 > + cat /proc/mdstat > Personalities : [raid6] [raid5] [raid4] [raid1] > md127 : inactive md0[0](S) > 19968 blocks super 1.2 > > md0 : active raid1 loop1[1] loop0[0] > 20000 blocks super non-persistent [2/2] [UU] > > unused devices: <none> > [root@dhcp-12-171 bug]# uname -r > 4.2.0 > [root@dhcp-12-171 bug]# mdadm -D /dev/md0 > /dev/md0: > Version : > Creation Time : Mon Sep 7 20:21:20 2015 > Raid Level : raid1 > Array Size : 20000 (19.53 MiB 20.48 MB) > Used Dev Size : 20000 (19.53 MiB 20.48 MB) > Raid Devices : 2 > Total Devices : 2 > > State : clean > Active Devices : 2 > Working Devices : 2 > Failed Devices : 0 > Spare Devices : 0 > > Number Major Minor RaidDevice State > 0 7 0 0 active sync /dev/loop0 > 1 7 1 1 active sync /dev/loop1 > [root@dhcp-12-171 bug]# mdadm -D /dev/md127 > /dev/md127: > Version : 1.2 > Raid Level : raid0 > Total Devices : 1 > Persistence : Superblock is persistent > > State : inactive > > Name : dhcp-12-171.nay.redhat.com:0 (local to host dhcp-12-171.nay.redhat.com) > UUID : 40ace956:a9dd0793:f4984d2b:8431b92b > Events : 17 > > Number Major Minor RaidDevice > > - 9 0 - /dev/md0 > > Best Regards, > Yi Zhang
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