[NCLUG] RAID-1 and disk speed

[Kasey Erickson]

> My thought is that if I were to pair a very fast SSD with a more reliable
> traditional magnetic disk...

>  ...with the added security of the real disk?

I moved to SSD on my laptop _because_ of the unreliability of spindled
storage.  I've had two drive failures this last year, seagate 320G and
seagate 200GB.  Flash specs put cell failure at about 5 years, write
100GB/day on 128GB.  No moving parts means little chance for
mechanical failure.

The flash controller is the most important part of the disk.  I
personally like Intel and Samsung controllers because of solid
performance and great user reviews from several online hardware
vendors.

I see mixed SSD and disk (in RAID) as a cost cutting strategy not as a
reliability improvement.

Kasey


On Tue, Oct 20, 2009 at 10:23 AM,  <grant at amadensor.com> wrote:
> I have a question.   Has anyone tried pairing very different speed disks
> with a mirrored RAID array?   Do you manage to get the faster one to
> answer most of the time, at least for reads?
>
>
> My thought is that if I were to pair a very fast SSD with a more reliable
> traditional magnetic disk, could the application see at least some of the
> benefit of the improved performance, with the added security of the real
> disk?
>
> Also it could be fun to do this with the block device over network trick
> that has been in the kernel for a few years, and have the second drive be
> in a different physical machine.   Imagine a RAID mirror in another
> building for added safety in case of disaster.
>
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