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Petrus Theron
Asked: 2017-07-12 03:37:40 +0800 CST

Instruct Hetzner installimage to use SSD as primary OS drive

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Purchased a dedicated Hetzner server with 2x small SSDs and 2x large HDDs paired with hardware RAID. Running installimage from Rescue OS shows this as config:

# Adaptec RAID (LD 0): no name
DRIVE1 /dev/sda
# Adaptec RAID (LD 1): no name
DRIVE2 /dev/sdb
...

Lower down, it shows,

## your system has the following devices:
#
# Disk /dev/sda: 749 GB (=> 697 GiB).
# Disk /dev/sdb: 119 GB (=> 111 GiB).

I set SWRAID 0. How do I tell the script to mount the SSD pair as the primary drive for installing the OS?

My first attempt was to swap the DRIVEx statements around, which resulted in this on Debian:

root@Debian-90-stretch-64-minimal / # lsblk
NAME    MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda       8:0    1   698G  0 disk
|-sda1    8:1    1    12G  0 part
| `-md0   9:0    0    12G  0 raid1 [SWAP]
|-sda2    8:2    1   512M  0 part
| `-md1   9:1    0 511.4M  0 raid1 /boot
`-sda3    8:3    1  99.1G  0 part
  `-md2   9:2    0    99G  0 raid1 /
sdb       8:16   1 111.6G  0 disk
|-sdb1    8:17   1    12G  0 part
|-sdb2    8:18   1   512M  0 part
`-sdb3    8:19   1  99.1G  0 part

As you can see the SSDs are a on sdb and the larger 698GB HDDs are on sda, but sda is not fully partitioned. It feels like potentially the drives are incorrectly paired.

ssd

2 Answers

  1. If the box is still "clean" maybe you could remove your two raid arrays and recreate them so the ssd-array is the first one.

    There is sufficient documentation on how to do this using arcconf on https://wiki.hetzner.de/index.php/Adaptec_RAID_Controller

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  2. You should remove one of the discs from the config.

    If you want to leave a drive in its current state and not make any changes to it you can leave it out (remove it) by placing a "#" before it. Please note that doing so means that the number after the next DRIVE variable must be properly adjusted.

    Otherwise, all 4 physical disks will be in one raid massive:

    Any software RAID levels are always applied to all (marked with DRIVE, as discussed above) drives. If you don't want a software RAID on a particular drive, you'll need to remove it accordingly.

    Later, after system installation, you can format and mount second raid massive

    https://wiki.hetzner.de/index.php/Installimage/en

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