what raid controller?
tuxebi at gmx.de
Sun Oct 12 15:18:44 BST 2008
Jonas Norlander wrote:
> 2008/9/22 John DeCarlo <johndecarlo at gmail.com>:
>> On Sun, Sep 21, 2008 at 3:51 PM, uriah heep <stan10x10 at gmail.com> wrote:
>>> I would like to set up mirroring on 2 sata WD hard drives. Could any one
>>> suggest a good low cost controller. This is for a home computer not
>> I agree with those who say that software RAID is the way to go. Much safer,
>> more reliable, cheaper
> I don't agree with you that a software RAID should be safer and more
> reliable than a real hardware RAID, it's one more layer that can mess
> things up if your are unlucky, but it's much cheaper and that could
> make it worth it depending how value your data is.
If your data has any value, you better have a good backup. Linux
Software Raid is a proven, very good alternative, and according to
measurements from my favourite PC magazine (ct in germany) it almost
always works at marginally the same speed as real hardware raid, as long
as your CPU is not strangled by other heavy loads.
In contrast, software raid has its advantage, when you come to change
hardware. Should your motherboard or hardware controller go south, you
will not succeed without a replacement unit. With software raid, you
simply install the same raid on the new computer and on you go.
> / Jonas
I would like to add to it now that I learned a few things.
While Linux supports a lot of "fake raid" chipsets, it does so by using
dmraid without any special "drivers" for the chipset on which it runs.
At first, this may look like a disadvantage against windows, where any
mobo manufacturer has its own driver disk. But it is in fact a huge
When a windows fake raid dies and you cannot get the same motherboard or
at least a mobo with a compatible fake raid, you will NOT have any
access to your data anymore.
This is true, except for Linux dmraid. As long as the original chipset
was supported by dmraid (not any chipset is supported!) you can use
dmraid to rebuild the raid in software even on a machine that has no
"hardware" raid capabilities at all.
Thus, dmraid opens up your disks for data access, again.
So you "only" lost your data, if dmraid does not support your original
Not bad for a software solution, I think.
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