Hello all,
i have already had a discussion on the software raid mailinglist and i
want to switch to this one :)
I am having a really strange problem with my md0 device running
centos7. after a new start of my server the md0 was gone. now after
trying to find the problem i detected the following:
Booting any installed kernel gives me NO md0 device. (ls /dev/md*
doesnt give anything). a 'cat /proc/partitions show me now
/dev/sd[a-d]1 partition. partprobe and a mdadm assemble gives me "disk
busy"
[root@quad live]# cat mdstat
Personalities : [raid6] [raid5] [raid4] [raid10]
unused devices: <none>
[root@quad ~]# partprobe
device-mapper: remove ioctl on WDC_WD20EFRX-68AX9N0_WD-WMC301255087p1
failed: Device or resource busy
Warning: parted was unable to re-read the partition table on
/dev/mapper/WDC_WD20EFRX-68AX9N0_WD-WMC301255087 (Device or resource
busy). This means Linux won't know anything about the modifications
you made.
....
....
[root@quad ~]# mdadm --assemble --force /dev/md0 /dev/sda1 /dev/sdb1
/dev/sdc1 /dev/sdd1
mdadm: /dev/sda1 is busy - skipping
mdadm: /dev/sdb1 is busy - skipping
mdadm: /dev/sdc1 is busy - skipping
mdadm: /dev/sdd1 is busy - skipping
booting from a usb stick for rescue my centos everything works. the
md0 device exists and is mounted. (rw).
[root@quad usb-rescue]# cat mount | grep '/data'
/dev/mapper/data-store on /mnt/sysimage/store type xfs
(rw,noatime,seclabel,attr2,largeio,nobarrier,inode64,logbufs=8,logbsize=256k,sunit=256,swidth=768,noquota)
/dev/mapper/data-tm on /mnt/sysimage/var/lib/vdr/video type xfs
(rw,noatime,seclabel,attr2,largeio,nobarrier,inode64,logbufs=8,logbsize=256k,sunit=256,swidth=768,noquota)
3rd option: i am booting the installed rescue kernel from disk:
i am getting a md0 device, but its not started. when i stop the md0 i
cant assemble it anymore (disk busy)
/dev/md0:
Version : 1.2
Creation Time : Wed Aug 20 19:28:52 2014
Raid Level : raid5
Used Dev Size : 1953382272 (1862.89 GiB 2000.26 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Thu Aug 17 22:38:14 2017
State : active, Not Started
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 128K
Name : quad.core.sartori.at:0 (local to host quad.core.sartori.at)
UUID : 9d020f27:c0542472:b95a18d2:5741114d
Events : 25458
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc1
4 8 49 3 active sync /dev/sdd1
anyone got an idea, in which direction the problem could be? more logs
needed? please help, i have no ideas anymore.
regards
Andy
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