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

  • Cisco Router Setup Guide and Tutorial Howto With Commands and Examples
  • Linux Bash Script To List All Connected IPs and their network name
  • Cisco Switches How To Get Of Port Line Status Console Messages
  • Cisco DHCP Snooping Relay Setup Information
  • Cisco Switch Setup Guide Command List
  • Cisco 2960 Switch Reset To Factory Defaults
  • How To Boot Cisco CUCM UCSInstall 8.6, 10, 11 and 12 on KVM/Proxmox
  • VBOX VirtualBox How To Import Raw .img Disk File
  • Windows Server 2012, 2016, 2019 How To Install and Missing Disabled Telnet Client
  • proxmox vm networking breaks when you restart your network on the hostnode
  • Linux ln symlink how to update existing symbolic link
  • Ubuntu 18.04 / Linux Mint 19.1 Cannot Type or Login - solution
  • LUKS Hard Drive Encryption on Linux Mint Ubuntu Debian etc how to mount encrypted hard drive
  • How to use nmap locate other machines/computers/servers on your network using nmap
  • Linux Mint 18.2 Create Config File To Start Application Upon Login
  • Dell Wyse Thin Client BIOS Access Key
  • sudoers file in /etc warning about comments/includes!
  • Centos 7 Reallocate logical volume space to another
  • lvm how to reduce volume size
  • letsencrypt certbot error "Unable to find a virtual host listening on port 80 which is currently needed for Certbot to prove to the CA that you control your domain. Please add a virtual host for port 80."