Hi,
sda was bad, changed it with a new one. Now Raid is inactive. I did dd the new one, tried --assemble or add, nothing work and in the gui table : no raid
Code
cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : inactive sdb[3](S) sdg[6](S) sde[8](S) sdd[0](S) sdf[7](S)
8790425656 blocks super 1.2Code
blkid
/dev/sdf: UUID="96b0e7b7-83aa-203f-1545-031b43caaa85" UUID_SUB="ce05af8c-7da1-c0a7-0a07-c10b0b154735" LABEL="zetta:0" TYPE="linux_raid_member"
/dev/sdg: UUID="96b0e7b7-83aa-203f-1545-031b43caaa85" UUID_SUB="440f9a88-1d42-020c-ba4d-d303afb76c7c" LABEL="zetta:0" TYPE="linux_raid_member"
/dev/sdd: UUID="96b0e7b7-83aa-203f-1545-031b43caaa85" UUID_SUB="b2460066-00b1-5070-cfe3-7ac67aae96c1" LABEL="zetta:0" TYPE="linux_raid_member"
/dev/sde: UUID="96b0e7b7-83aa-203f-1545-031b43caaa85" UUID_SUB="b243c911-8058-51ff-0413-31fb1528c36c" LABEL="zetta:0" TYPE="linux_raid_member"
/dev/sdc1: UUID="befea5ea-cd0e-4166-b3b0-6d2b79962bdf" TYPE="ext4" PARTUUID="54ca3768-01"
/dev/sdc5: UUID="cc9ca801-5eb7-4b50-9949-2102b786e751" TYPE="swap" PARTUUID="54ca3768-05"
/dev/sdb: UUID="96b0e7b7-83aa-203f-1545-031b43caaa85" UUID_SUB="ee7eab8f-dc90-e3be-146d-a4e09d104418" LABEL="zetta:0" TYPE="linux_raid_member"
/dev/sda: PTUUID="07a09a5d" PTTYPE="dos"Code
fdisk -l
Disk /dev/sdf: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: WDC WD20EFRX-68E
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/sdg: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: WDC WD20EFRX-68E
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/sdd: 1.4 TiB, 1500301910016 bytes, 2930277168 sectors
Disk model: ST1500DL003-9VT1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/sde: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: ST2000VN000-1H31
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/sdc: 111.8 GiB, 120034123776 bytes, 234441648 sectors
Disk model: PNY CS900 120GB
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x54ca3768
Device Boot Start End Sectors Size Id Type
/dev/sdc1 * 2048 226344959 226342912 108G 83 Linux
/dev/sdc2 226347006 234440703 8093698 3.9G 5 Extended
/dev/sdc5 226347008 234440703 8093696 3.9G 82 Linux swap / Solaris
Disk /dev/sdb: 1.4 TiB, 1500301910016 bytes, 2930277168 sectors
Disk model: WDC WD15EARX-00Z
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/sda: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: WDC WD20EFAX-68F
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x07a09a5dCode
mdadm --assemble /dev/md0 /dev/sd[abdefg] --verbose --force
mdadm: looking for devices for /dev/md0
mdadm: Cannot assemble mbr metadata on /dev/sda
mdadm: /dev/sda has no superblock - assembly aborted
if you had removed the drive from the array, then removed it from the machine, then installed the new drive, prepped it then added it to the array it would have been fine.