> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Ruslan Sivak
> Sent: Saturday, May 05, 2007 12:20 PM
> To: CentOS mailing list
> Subject: Re: Installing from a custom kernel
>
> Akemi Yagi wrote:
> > On 5/4/07, Ruslan Sivak <rsivak@xxxxxxxxxxxxx> wrote:
> >>
> >> Yes, I would be interested in doing that. Building the md raid10
> >> personality as a module. How would I go about doing this?
> Toby Bluhm
> >> mentioned in a separate thread that he had that module on SL4.4
> >
> >> [root@tikal ~]# modprobe raid10
> >>
> >> [root@tikal ~]# lsmod | grep raid
> >> raid10 23233 0
> >> raid1 20033 1
> >
> > As David Miller noted in this thread, CentOS includes the
> raid10 module.
> >
> > $ locate raid10.ko
> > /lib/modules/2.6.18-8.1.1.el5/kernel/drivers/md/raid10.ko
> >
> /lib/modules/2.6.18-8.1.1.el5.centos.plus.1/kernel/drivers/md/
> raid10.ko
> > /lib/modules/2.6.18-8.el5/kernel/drivers/md/raid10.ko
> >
> > # modprobe raid10
> > # modprobe raid1
> > # lsmod | grep raid
> > raid1 55745 0
> > raid10 55873 0
> >
> > So, they are there.
> >
> > Akemi
> > _______________________________________________
>
> Interesting. I don't believe they were there for me in a
> fully booted
> system. I guess I would have to reinstall and find out. Is
> there a way
> to load it when I'm just first installing and going to a shell?
I believe anaconda only supports installation on raid0 and raid1.
What you can do in your setup, since it is only a 4 disk setup is:
create 4 128MB raid partitions at the start of each drive for a
/dev/md0 raid1 with 2 spares, create an ext3 fs for /boot on it
create 4 raid partitions of the remaining spaces, create a /dev/md1
with 2 drives, and a /dev/md2 with 2 drives.
make /dev/md1 and /dev/md2 lvm volumes
create a volume group of /dev/md1 and /dev/md2, say called CentOS,
create a 'root' logical volume of say 16G with an interleave of 2,
create a 'swap' logical volume of say 4G with an interleave of 2
There you go, it might not be the clean raid10 you envisioned, but
it will work the same, plus you may find using lvm for the striping
has some advantages.
1) Recognized by most/all grubs in 2.6
2) will allow migration of data to/from other volume groups
3) it's resizeable and reconfigurable
Once RAID10 is setup and your data is on-board, there isn't much
reconfiguration that can be done.
-Ross
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