linux raid questions

[Jason Justman]

Probably not.  The raid support for linux is based on your /etc/raidtab,
and those specialized card have their own settings.  If you have either
one of those cards, its not worthwile to use the software raid tools.
You essentally are offloading work from a dedicated piece of hardware to
your CPU.  Kind of not as productive ;).

Granted, I think the more important question is - Can you use the
package of raidtools to hot rebuild mirrors rather than having to
reboot?  I bet that answer is no because both of those cards are IDE
raids (which is generally looked down upon for making a raid.  I think
nugget from distrubited.net said it best - RAID with IDE is like racing
a ford pinto.)  Some of the DPT based cards (REAL RAID cards ;) can
provide more detailed status/configuration info which is needed for the
good care and feeding of a raid - see
http://www.twisted-helices.com/computing/linux/dpt_raid.html

Jason


Adam McDougall wrote:

> Can either of these pick up the config off of promise raid or HPT
> 370 raid sets?  Any word of it happening or dunno?
>
> On 19 Sep 2000, Ben Pfaff wrote:
>
> > Mark Szidik <szidikm@mlc.lib.mi.us> writes:
> >
> > > I am setting up software RAID in Linux for the first time.
> > > (I am going by the HOWTO for version .90 of the raidtool)
> >
> > The most likely problem is that your kernel's RAID subsystem
> > doesn't match the tools that you are using.  There are two major
> > revisions of RAID in Linux:
> >
> >       1. The original RAID that is built into kernels 2.0.x and
> >            2.2.x.
> >
> >       2. Ingo's RAID 0.9.0, which is in kernel 2.4.x
> >            prereleases and which is also integrated into some
> >            vendor kernels.  Alan Cox keeps talking about putting
> >            these patches into the next 2.2.x release, but so far
> >            this hasn't happened.
> >
> > The on-disk representations for these two RAID versions are not
> > compatible, and neither are the tools used to manipulate them.
> > Make sure that you're using tools that match your kernel.
> > _______________________________________________
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> > linux-user@egr.msu.edu
> > http://www.egr.msu.edu/mailman/listinfo/linux-user
> >
>
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