[luau] Software RAID (Donation of Oracle 9i Linux)

[Eric Hattemer]

> You cant add RAID to the hdd you have the OS installed. I have 1,5. Good
to

You actually can add raid to the hard drive where you have the OS installed
in most modern distros.  Its a bit tricky in the old ones.  The old ones
require that you install to a different hard drive, then set up a software
raid table, then move the system to the raid array, then edit the fstab,
then reboot.  This is a lot of work.  In systems after about RH 7.1, the
graphical install allows you to put / on a software raid array.  Usually
what you'll want to do, however, is make one partition on the first drive be
the /boot partition (non-raid) just to make kernel configuration easier.
Then put / on the raid array.  You can get some of the performance bonuses
from raid 0/5 by putting /usr, /home, /bin, /opt and whatever on separate
drives if you have a big enough system.

-Eric Hattemer

> > Brian
> >
> >
> > -----Original Message-----
> > From: luau-admin at videl.ics.hawaii.edu
> > [mailto:luau-admin at videl.ics.hawaii.edu]On Behalf Of Eric Hattemer
> > Sent: Thursday, August 15, 2002 2:53 PM
> > To: luau at videl.ics.hawaii.edu
> > Subject: Re: [luau] Software RAID (Donation of Oracle 9i Linux)
> >
> >
> > In litteral terms, you can do software raid on linux with 1 HD and two
> > partitions.  However, it probably hurts performance, rather than
> > improving
> > it.  The multiple heads on a hard drive all line up vertically and scan
> > what's called a cyllinder (multiple sectors stacked on top of each
> > other).
> > They cannot read two partitions at the same time.  You could test out
> > software raid with two partitions, but I don't think you'd be too happy
> > with
> > it.  You can probably get RAID 1 going with a very slight advantage.  It
> > won't save you in case your drive fails entirely, but if you start to
> > get
> > bad sectors or filesystem errors, at least your HD is backed up on
> > another
> > partition.
> >
> > -Eric Hattemer
> >
> > ----- Original Message -----
> > From: "W. Wayne Liauh" <LiauhW001 at Hawaii.rr.com>
> > To: <luau at videl.ics.hawaii.edu>
> > Sent: Thursday, August 15, 2002 1:54 PM
> > Subject: [luau] Software RAID (Donation of Oracle 9i Linux)
> >
> >
> > > <Not really :)>
> > >
> > > Just thought that with the current advancement of multiple-head HDs,
> > things might have changed.
> > > But I suppose if someone can develop a new type of BIOS?
> > >
> > >
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