Hi all,
I created a RAID 1 with 2 disks, but I expected that the second one is at the end of it's lifetime, so I wanted to replace it with an other one. So far, so good.
However, I wanted to do this only with the GUI, and because I saw no "remove", I thought I will add the new one first, then after sync I will remove the old one. (I know, I will read the manuals first...)
But when I removed the old one, the raid became "clean, degraded", with two hard disks. How can I make it clean again?
details of the raid:
Version : 1.2
Creation Time : Thu Oct 20 00:02:50 2016
Raid Level : raid1
Array Size : 488222528 (465.61 GiB 499.94 GB)
Used Dev Size : 488222528 (465.61 GiB 499.94 GB)
Raid Devices : 3
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Sun Oct 23 17:41:34 2016
State : clean, degraded
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Name : raspberrypi:NAS (local to host raspberrypi)
UUID : 1b5d2b14:93f00308:227f0e76:04eb9d3d
Events : 503
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 16 1 active sync /dev/sdb
2 8 0 2 active sync /dev/sda
And the rest that is required by the sticky forum
output of cat /proc/mdstat:
Personalities : [raid1]
md0 : active raid1 sdb[1] sda[2]
488222528 blocks super 1.2 [3/2] [_UU]
output of blkid:
/dev/mmcblk0p1: SEC_TYPE="msdos" LABEL="boot" UUID="7D5C-A285" TYPE="vfat"
/dev/mmcblk0p2: UUID="5d18be51-3217-4679-9c72-a54e0fc53d6b" TYPE="ext4" LABEL="omv"
/dev/mmcblk0p3: LABEL="data" UUID="fa36508a-b3c4-4499-b30a-711dd5994225" TYPE="ext4"
/dev/sdb: UUID="1b5d2b14-93f0-0308-227f-0e7604eb9d3d" UUID_SUB="26052ce7-837f-e2c0-2471-ff05bff5cb74" LABEL="raspberrypi:NAS" TYPE="linux_raid_member"
/dev/md0: LABEL="nas" UUID="d23f4887-0b6e-4dc0-899d-96f5795f1d1f" TYPE="ext4"
/dev/sda: UUID="1b5d2b14-93f0-0308-227f-0e7604eb9d3d" UUID_SUB="2a92f891-d186-59fa-d764-0eec290c2104" LABEL="raspberrypi:NAS" TYPE="linux_raid_member"
output of fdisk -l:
Disk /dev/mmcblk0: 7948 MB, 7948206080 bytes
4 heads, 16 sectors/track, 242560 cylinders, total 15523840 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000b5098
Device Boot Start End Blocks Id System
/dev/mmcblk0p1 8192 122879 57344 c W95 FAT32 (LBA)
/dev/mmcblk0p2 122880 7028735 3452928 83 Linux
/dev/mmcblk0p3 7028736 15523839 4247552 83 Linux
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sda doesn't contain a valid partition table
Disk /dev/sdb: 500.1 GB, 500074283008 bytes
255 heads, 63 sectors/track, 60797 cylinders, total 976707584 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdb doesn't contain a valid partition table
Disk /dev/md0: 499.9 GB, 499939868672 bytes
2 heads, 4 sectors/track, 122055632 cylinders, total 976445056 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md0 doesn't contain a valid partition table
contents of conf:
# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
#
# by default, scan all partitions (/proc/partitions) for MD superblocks.
# alternatively, specify devices to scan, using wildcards if desired.
# Note, if no DEVICE line is present, then "DEVICE partitions" is assumed.
# To avoid the auto-assembly of RAID devices a pattern that CAN'T match is
# used if no RAID devices are configured.
DEVICE partitions
# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# definitions of existing MD arrays
ARRAY /dev/md0 metadata=1.2 spares=1 name=raspberrypi:NAS UUID=1b5d2b14:93f00308:227f0e76:04eb9d3d
output of mdadm:
ARRAY /dev/md0 level=raid1 num-devices=3 metadata=1.2 name=raspberrypi:NAS UUID=1b5d2b14:93f00308:227f0e76:04eb9d3d
devices=/dev/sdb,/dev/sda