raid controller
Lennart Sorensen
lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org
Wed Oct 5 13:47:36 UTC 2005
On Tue, Oct 04, 2005 at 04:17:33PM -0400, CLIFFORD ILKAY wrote:
> I will second what Lennart wrote and can cite first-hand experience
> with the problem of using hardware RAID. I have a couple of servers
> that use the MegaRAID controller. MegaRAID is not exactly uncommon. I
> had Linux running on both of those machines at one time or another,
> one a Dell, the other an HP, both fully supporting the drives that
> were created by the hardware controller. They were both long overdue
> for a refresh so rather than do an upgrade and preserve the same disk
> formatting, I wanted to do a fresh installation with LVM so that I
> could have some flexibility. No matter which distro I tried, no
> current version would detect the drives created by the hardware RAID
> controller. It turns out there was a change in the megaraid module
> after the 2.6.9 version of the kernel. The same module no longer
> supports the older hardware. So, I blew away the hardware RAID sets,
> disabled the RAID controllers completely, and used Linux software
> RAID and LVM. Software RAID is not likely to change to the point
> where you will not be able to see the drives that were created by
> older versions whereas apparently, hardware RAID support can change
> for the worse over time.
Actually it appears there are now two megaraid drivers, and you need to
use the right one to access the old format. I think that would be the
megaraid_mbox driver. The other driver is the megaraid driver.
In the older kernels yeah that was just megaraid.
I haven't used a megaraid card so I am not sure why they changed things
and started having two drivers.
Lennart Sorensen
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