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Zeig mal die Superblöcke der Disks.

Partitionen:

root@gate:~# parted /dev/sda p
Model: ATA WDC WD20EFRX-68A (scsi)
Disk /dev/sda: 2000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name  Flags
 1      17.4kB  1000kB  983kB                      bios_grub
 2      1049kB  302MB   301MB                      raid
 3      302MB   30.3GB  30.0GB                     raid
 4      30.3GB  30.8GB  513MB                      raid
 5      30.8GB  2000GB  1970GB                     raid

root@gate:~# parted /dev/sdb p
Model: ATA WDC WD20EFRX-68A (scsi)
Disk /dev/sdb: 2000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name  Flags
 1      17.4kB  1000kB  983kB                      bios_grub
 2      1049kB  302MB   301MB                      raid
 3      302MB   30.3GB  30.0GB                     raid
 4      30.3GB  30.8GB  513MB                      raid
 5      30.8GB  2000GB  1970GB                     raid

root@g
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Output from sfdisk:
Disk /dev/sda: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
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: gpt
Disk identifier: 83B2E217-34D8-497D-92D7-9D4F2E58F121

Old situation:

Device        Start        End    Sectors  Size Type
/dev/sda1        34       1953       1920  960K BIOS boot
/dev/sda2      2048     589823     587776  287M Linux RAID
/dev/sda3    589824   59183103   58593280   28G Linux RAID
/dev/sda4  59183104   60184575    1001472  489M Linux RAID
/dev/sda5  60184576 3907028991 3846844416  1.8T Linux RAID

Partition 1 does not start on physical sector boundary.

Disk /dev/sdb: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
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: gpt
Disk identifier: CD154A5C-3000-4E11-9B39-B4B4BAE9ACEE

Old situation:

Device        S
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Seems as if the disk needs to be exchanged:

Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed: read failure       90%     50113         60067424