Re: [gentoo-user] Tips for fresh install with GRUB2+RAID1+LVM2

[Neil Bothwick <neil@digimed.co.uk>]

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On Wed, 20 May 2015 14:29:27 +0100, Mick wrote:

> > > Thanks, does the 1mb partition have to have anything in it?  
> > 
> > No. If doesn't even need a filesystem, just create the partition with
> > the correct type and GRUB will work.  
> 
> From what I recall gdisk just starts at sector 2048, doesn't this leave
> space for MBR code?  Note the message "MBR: protective" below:

So does fdisk with an MBR partition table. It defaults to 2048 to avoid
alignment problems with disks using 4k blocks.

> # gdisk /dev/sda
> GPT fdisk (gdisk) version 0.8.10
> 
> Partition table scan:
>   MBR: protective
>   BSD: not present
>   APM: not present
>   GPT: present
> 
> Found valid GPT with protective MBR; using GPT.

You still need the BIOS boot partition. This is about BIOS vs UEFI
booting.

% sudo gdisk -l /dev/sda
GPT fdisk (gdisk) version 1.0.0

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 5860533168 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 04EFD165-FDDF-4C24-BA81-868B97BF9949
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860533134
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048            4095   1024.0 KiB  EF02  BIOS boot partition
   2            4096         2101247   1024.0 MiB  8300  boot0
   3         2101248        35655679   16.0 GiB    8200  swap0
   4        35655680      5860533134   2.7 TiB     8300  silastic0


-- 
Neil Bothwick

Top Oxymorons Number 2: Exact estimate

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