[sclug] RAID-1 on asymmetric disks?

David Given dg at cowlark.com
Sun Mar 8 00:57:04 UTC 2009

Hash: SHA1

Alex Butcher wrote:
> I doubt you'll encounter any problems. I do md RAID between partions
> "all the
> time"; I even tend to have a RAID0 paid and a RAID1 pair - the former for
> 'disposable' parts of the hierarchy, like /tmp

On a related topic, I'm mulling over the idea of making myself a DIY SSD
out of USB thumb drives. They're approaching 1 UKP per GB these days,
which makes them about half the price of a real SSD.

As one of the key advantages of this technique is that adding capacity
ought to be easy and cheap, I'm trying to figure out the best way of
designing the system to allow this. Unfortunately as far as I can tell
increasing the size of a RAID5 array looks to be rather hard, especially
if the drives are different sizes. (Next year a 32GB flash drive would
probably be the same price as a 16GB drive this year. No, I don't want
to add this as two 16GB partitions.)

Any suggestions of things I should look into? (Other than 'use ZFS', of
course. I would if I could.)

- --
David Given
dg at cowlark.com
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