Re: change UUID of RAID devcies

Am 13.09.22 um 13:17 schrieb Pascal Hambourg:

On 13/09/2022 at 13:12, Reindl Harald wrote:

quoted

Am 13.09.22 um 12:39 schrieb Pascal Hambourg:

quoted

On 13/09/2022 at 12:28, Reindl Harald wrote:

quoted

BTW: currently the machines are BIOS-boot - am i right that the 2 TB 
limitation only requires that the parts which are needed for booting 
are on the first 2 TB and i can use 4 TB SSD's on the two bigger 
machines?

Which 2 TB limitation ? EDD BIOS calls use 64-bit LBA and should not 
have any practical limitation unless the BIOS implementation is flawed.

(...)

quoted

"For example, you cannot create 3TB or 4TB partition size (RAID based) 
using the fdisk command. It will not allow you to create a partition 
that is greater than 2TB" makes me nervous

This is a DOS/MBR partition scheme limitation, not a BIOS limitation, 
and irrelevant with GPT partition scheme.

quoted

how to get a > 3 TB partition for /dev/md2

Use GPT

yeah but the goal is to convert a existing RAID1/RAID10/RAID10 setup 
with 4x2 TB drives to RAID1/RAID1/RAID1 with 2x4 Tb drives and so my 
/boot won't work with GPT :-)

the two smaller machines are easier because of finally 2 TB drives - i 
really think loudly about a USB stick for /boot with regular dd-images 
and leave the existing RAID1 /boot ignored

[root@srv-rhsoft:~]$ df
Filesystem     Type  Size  Used Avail Use% Mounted on
/dev/md0       ext4  482M   77M  401M  17% /boot
/dev/md1       ext4   29G  8.9G   20G  31% /
/dev/md2       ext4  3.6T  2.0T  1.7T  55% /data