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Ubuntu 20.04.3 on Dell R-620 with PERC H710 RAID controller installation reports error: attempt read-write outside of disk `hd0`

jp flag

I am trying to optimize the reliability, HD usage efficiency, and HD performance of a fresh install of Ubuntu 20.04.3 LTS on a Dell R-620 which has six 2 TB HD in a RAID-5 drive created and managed by the Dell PERC H710 PCIe RAID disk controller.

However after every clean installation from DVD and reboot, I get this error message from grub:

error: attempt read-write outside of disk hd0

I find that the Ubuntu installation program partitions the single /dev/sdb drive into what seems to me a reasonable set of three partitions:

/dev/sda1 1M BIOS boot

/dev/sda2 512M Microsoft basic data

/dev/sda3 9.1T Linux filesystem

I can successfully install Ubuntu if I create one 2TB RAID-1 disk for '/' and a second RAID-5 disk for '/mnt/data', but in that configuration only 400 GB of the 4 TB of the two '/' disks is used and disk i/o for '/' is 80 MBps while the /mnt/data disk i/o is 400+ Mbps.

So before I surrender and use that less efficient disk configuration, can anyone suggest how I could get around this problem?

Rob Robinett avatar
jp flag
In case someone finds my question, I found the answer at https://askubuntu.com/questions/867047/grub-attempt-to-read-or-write-outside-of-disk-hd0 In summary, you can't easily install Ubuntu 20.04 on a '/' partition larger than 2TB. So if you have a large disk you need to manually partition it with a (e.g. 100 GByte) '/' partition when installing from the CDROM.
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