Monday, April 1, 2019

RAID1: One RAID per Partition or Partitions on RAID device?

What is better suited for a normal Server:





  • several partitions, which are bundled as several RAID1 devices (/dev/md0, /dev/md1, ...) without any partitions, which are not mirrored.

  • one big /dev/md0, and partitions on this device



What are the biggest pros and cons of both approaches?
Is there a big difference, which one is the better choice for a normal server without frequent changes to disks and partition setup?



I haven't found any sites giving actual advice on this decision. The only thing i frequently read was: DO NOT bundle /dev/hda /dev/hdb (without at least one partition) to a RAID, because this causes the kernel to detect the RAID partitions on the raw /dev/hdX devices, too.

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