RAID setup

From Elvanör's Technical Wiki
Revision as of 18:44, 30 September 2009 by Elvanor (talk | contribs) (New page: = Concepts = == Types == * A RAID setup can either be hardware (hardware card that includes a RAID controller, in this case no drivers are needed) or software (in this case Linux drivers...)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

Concepts

Types

  • A RAID setup can either be hardware (hardware card that includes a RAID controller, in this case no drivers are needed) or software (in this case Linux drivers are needed). There is a third type called firmware RAID that is neither software nor hardware. It seems no drivers are needed but there is a burden on the host CPU.

Possible setups

  • RAID 0 is stripping: basically two drives combined into one big drive. If one drive breaks, all data is lost so this is risky.
  • RAID 1 is mirroring. There is redundancy but at a high cost.

Tools

  • mdadm is used to create the RAID arrays:
mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1

LVM2

  • LVM is a set of userspace tools that allows dynamic resizing of partitions without rebooting and other stuff like that. Untested yet.
Retrieved from "https://wiki.elvanor.net/index.php?title=RAID_setup&oldid=3463"