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The Cisco CallManager 5.x installation fails, and the "Error 21" GRUB error message appears
When Cisco CallManager 5.x is installed, after the first reboot of the installation, the Grub loading....please wait error message appears. Then, in the next line, the Error 21 error message appears, and everything stops.The error 21 message is a generic Linux error that literally means Can not find disk.
This might happen because the Grand Unified Bootloader (GRUB) points to a Hard Drive (HD), or the Basic Input/Output System (BIOS), that the server cannot reach.
In order to fix the problem, complete these steps:
Make sure the server specifications are correct and Redundant Array of Independent Disks (RAID) is supported with Cisco CallManager 5.x.
Remove the second HD, and set the RAID controller to the factory defaults.