mdadm: /dev/sdb1 not large enough to join array solution

mdadm --manage /dev/md1 --add /dev/sdb1
mdadm: metadata format 00.90 unknown, ignored.
mdadm: metadata format 00.90 unknown, ignored.
mdadm: metadata format 00.90 unknown, ignored.
mdadm: /dev/sdb1 not large enough to join array

md1's first primary member /dev/sda3 has 57394 cylinders while the /dev/sdb1 has 57393 (1 less cylinder) which is why it won't work.


 fdisk -l /dev/sda3

Disk /dev/sda3: 472.0 GB, 472081720320 bytes
255 heads, 63 sectors/track, 57394 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000



fdisk -l /dev/sdb1

Disk /dev/sdb1: 472.0 GB, 472081688064 bytes
255 heads, 63 sectors/track, 57393 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Disk /dev/sdb1 doesn't contain a valid partition table

 

The solution is to delete /dev/sdb1 and make the partition the same 57394 cylinders.

fdisk /dev/sdb

The number of cylinders for this disk is set to 121601.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): d
Selected partition 1

Command (m for help): p

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000976e6

   Device Boot      Start         End      Blocks   Id  System

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-121601, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-121601, default 121601): 57395

Command (m for help): wq
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.


#even though I'm matching the cylinders the size still ends up being off!

fdisk -l /dev/sdb1

Disk /dev/sdb1: 472.0 GB, 472089913344 bytes
255 heads, 63 sectors/track, 57394 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Disk /dev/sdb1 doesn't contain a valid partition table


#but it ends up being a little bigger so it makes mdadm happy
mdadm --manage /dev/md1 --add /dev/sdb1
mdadm: metadata format 00.90 unknown, ignored.
mdadm: metadata format 00.90 unknown, ignored.
mdadm: metadata format 00.90 unknown, ignored.
mdadm: added /dev/sdb1


Tags:

mdadm, dev, sdb, array, solutionmdadm, md, metadata, format, ignored, primary, sda, cylinders, cylinder, fdisk, disk, gb, bytes, sectors, identifier, doesn, contain, valid, partition, delete, larger, setups, software, versions, lilo, booting, partitioning, oss, dos, os, selected, extended, default, wq, altered, ioctl, syncing, disks, matching,

Latest Articles

  • Linux Ubuntu Cannot Print Large Images
  • Cannot Print PDF Solution and Howto Resize
  • Linux Console Login Screen TTY Change Message
  • Apache Cannot Start Listening Already on 0.0.0.0
  • MySQL Bash Query to pipe input directly without using heredoc trick
  • CentOS 6 and 7 / RHEL Persistent DHCP Solution
  • Debian Ubuntu Mint rc-local service startup error solution rc-local.service: Failed at step EXEC spawning /etc/rc.local: Exec format error
  • MySQL Cheatsheet Guide and Tutorial
  • bash script kill whois or other command that is running for too long
  • Linux tftp listens on all interfaces and IPs by DEFAULT Security Risk Hole Solution
  • python import docx error
  • Cisco Unified Communications Manager Express Cheatsheet CUCME CME
  • Linux Ubuntu Debian Missing privilege separation directory: /var/run/sshd
  • bash how to count the number of columns or words in a line
  • bash if statement how to test program output without assigning to variable
  • RTNETLINK answers: Network is unreachable
  • Centos 7 how to save iptables rules like Centos 6
  • nfs tuning maximum amount of connections
  • qemu-kvm error "Could not initialize SDL(No available video device) - exiting"
  • Centos 7 tftpd will not work with selinux enabled