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md is multiple devices. It's a RAID implementation in Linux kernel available since kernel release 2.0. It allows you to create RAID level 0, 10, 4, 5 and 6. It
by jensv 8y ago
md is multiple devices. It's a RAID implementation in Linux kernel available since kernel release 2.0. It allows you to create RAID level 0, 10, 4, 5 and 6. It has various optimizations like utilizing SSE and MMX instructions. It's a standard software RAID in Linux.
- throwaway2048 8y agoit does many things besides RAID, its more or less a generic "do things with abstracted block layers" tool these days.
- thoxahr 8y agoThe similarly named "dm" (device mapper) is a generic abstract block layer tool. md is still specifically a software raid implementation.
- babuskov 8y ago> It allows you to create RAID level 0, 10, 4, 5 and 6. I'm pretty sure it supports RAID level 1 as well: https://raid.wiki.kernel.org/index.php/RAID_setup#RAID-1 https://raid.wiki.kernel.org/index.php/RAID_setup#RAID-1 Or am I misunderstanding something?
- dspillett 8y agoIt does. Also the less standard RAID10-over-three-devices (similar to the scheme called RAID1E by some hardware RAID controllers, though with more layout options than they usually supply).
- rincebrain 8y agoAt first I thought you were describing a 3-way mirror, then I looked into it, and that's a cleverly kinky idea.
- nailer 8y agoI thought it was 'meta devices'? Hrm the docs don't actually say: https://raid.wiki.kernel.org/index.php/A_guide_to_mdadm https://raid.wiki.kernel.org/index.php/A_guide_to_mdadm
- tyingq 8y agoHere's a 2002 reference to mdadm being referred to as "multiple devices admin". https://web.archive.org/web/20180211041128/www.linuxdevcenter.com/pub/a/linux/2002/12/05/RAID.html https://web.archive.org/web/20180211041128/www.linuxdevcente...