Actually RAID/volume management is superlimited when not in filesystem...
Posted Jan 16, 2009 0:02 UTC (Fri) by topher
In reply to: Actually RAID/volume management is superlimited when not in filesystem...
Parent article: Btrfs aims for the mainline
What you're asking for is quite doable right now, using RAID+LVM
(actually, only RAID is needed).
1. Keep most of the data on just one drive (for movies from my own
2. Keep the rest in RAID-5 form (for movies in games and such: PITA to
reinstall but can be done if needed).
3. Keep my own personal files (1% of total size or so) duplicated 4 times
(on 4 HDDs).
Assuming 4 500GB Disks:
Drive 1: 10GB partition, RAID1; 490GB partition, stand alone
Drive 2: 10GB partition, RAID1; 490GB partition, RAID5
Drive 3: 10GB partition, RAID1; 490GB partition, RAID5
Drive 4: 10GB partition, RAID1; 490GB partition, RAID5
The 10GB partitions are all part of a 4x replicated RAID1 for your
personal files. For additional redundancy across the system, put /boot and
/ on that RAID1 also, install GRUB on the bootloader for each disk, and you
can lose any disk and boot the system. The stand alone 490GB partition is
for your movies. The 3 490GB partitions in the RAID5 are for the rest of
It's not required, but you could make use of LVM on top of those to more
easily split things out as desired.
What you're asking for in a couple of your other posts, however, is not
a simple thing. It doesn't fit well with how computers work in general.
You seem to be saying you want to just save something and have the computer
magically understand that it's "important" or "not important" or "kind of
important" and know what that means. But computers don't do that. Someone
has to tell them what each of those categories means, and how they're
defined. And since it's your data, it's going to be hard for someone else
to do that.
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