Bill Dossett wrote:
Hi,Does anyone from redhat ever hang out on these lists? I REALLY, need to figure out how the hell they do bootable software RAID as modules.... Is this some form of mystic secret that redhat don't want us to know? Or doesn't anyone from Redhat read these lists? I am trying to convert a system to bootable software raid from a single disk system. I really really really do not want to have to spend three days configuring this server after a reload. However.. all documents that I read about bootable software raid assume you are building your own kernel... and I know that redhat loads the raid modules .. most likely via initrd I guess, but try as I might, I can't get this into a bootable system.
[root@sflory sflory]# cd /boot/ [root@sflory boot]# zcat initrd-2.4.18-18.8.0.img >1 [root@sflory boot]# mount -o loop 1 m1 [root@sflory boot]# cat m1/linuxrc #!/bin/nash echo "Loading raid0 module" insmod /lib/raid0.o echo "Loading jbd module" insmod /lib/jbd.o echo "Loading ext3 module" insmod /lib/ext3.o echo Mounting /proc filesystem mount -t proc /proc /proc raidautorun /dev/md0 echo Creating block devices mkdevices /dev echo Creating root device mkrootdev /dev/root echo 0x0100 > /proc/sys/kernel/real-root-dev echo Mounting root filesystem mount -o defaults --ro -t ext3 /dev/root /sysroot pivot_root /sysroot /sysroot/initrd umount /initrd/proc [root@sflory boot]#
Why do you need to build a custom kernel. Red Hat always compiles the raid driver as a module. If you install a kernel it should create an initrd for you. (At least it has for me for years.) Also if you just install a kernel instead of upgrading you should still have your old config.If I build my own kernel, then I will continue to have problems every time I run up2date and I'll have to constantly build new kernels and while I don't mind building a kernel, I used to do it all the time, I am trying to make things easier to maintain around here.. not harder.
Can anyone point me in the right direction to any documents about how to do this?
Look and the linux documentation project.
And secondly.... is there any further info on bootable sofware
raid and what I do if one of the disk fails? I pulled one of the
disks the other day while the system was powered down, and it wouldn't
boot at all while it was out... that certainly is _not_ the way
my hardware RAID systems work. I am using the GRUB boot loader
and I assumed that each disk was bootable, but no go here, I had
to put the disk back in before it would boot up again.. if they
are going to offer us software raid, then I think they should follow
thru and tell us how to use it.
On older releases of Redhat lilo/grub was installed on only the 1st drive. You can manually install lilo on both disks fairly easily. (I don't use grub.)
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