Re: [Xen-users] xen soft raid1 - SOLVED

[marek cervenka <cervajs@xxxxxxxxxx>]

> > > > marek cervenka wrote:
> > > > > do you have someone running xen 3.0 with software raid1 on root?
> > > > > i'm trying recompile kernel (3.0 stable) with correct CPU (P4), but 
> > > > > still
> > > > > no success
> > > > Works fine for me..
> > > >
> > > > > machine reboot when loading module raid1.ko :(
> > > > Perhaps try adding 'noreboot' in your grub.conf so you can see any
> > > > error messages?
> > > thanks, this help
> > >
> > > now i can see problem
> > >
> > > raidautorun: RAID_AUTORUN failed: 19
> > > Creating root device
> > > Mounting root filesystem
> > > EXT3-fs: unable to read superblock
> > >
> > > system is centos-4.2
> > > with 2.6.9-22 kernel boot works ok
because this is the same problem like this 
http://lists.xensource.com/archives/html/xen-users/2005-12/msg00355.html
and solution isnt ported to mainstream, i will try describe the problem 
(imho BUG that affect ALL software raid installations on redhat/fedora 
systems - maybe other distros too)
from Documentation/md.txt
---cut---
Boot time autodetection of RAID arrays
--------------------------------------

When md is compiled into the kernel (not as module), partitions of
type 0xfd are scanned and automatically assembled into RAID arrays.
This autodetection may be suppressed with the kernel parameter
"raid=noautodetect".  As of kernel 2.6.9, only drives with a type 0
superblock can be autodetected and run at boot time.
---cut--

in standard xensource kernel is "md" as module
CONFIG_BLK_DEV_MD=m

in redhat kernels is
CONFIG_BLK_DEV_MD=y (and raid autodetection work)

can you change (xensource) CONFIG_BLK_DEV_MD to yes ?

thanks


---------------------------------------
Marek Cervenka
Centrum Vypocetni Techniky
CVT             - http://cvt.fpf.slu.cz
FPF SLU OPAVA   - http://www.fpf.slu.cz
LCNA            - http://lcna.slu.cz
=======================================


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