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Old 03-20-2008, 12:58 AM   #1
Registered: Dec 2004
Location: Japan
Distribution: REDHAT9.0, Mandrake10.1
Posts: 404

Rep: Reputation: 31
vxvm root-mirror for RHEL4

I am using veritas foundation storage basic 4.1 on my RHEL4 box.
There are two sata disks conneting to my ASUS p5k motherboard.
vxdiskadm has enabled root-mirror as follows.

# vxprint -tv
Disk group: rootdg

v rootvol - ENABLED ACTIVE 30716217 ROUND - root
v swapvol - ENABLED ACTIVE 5877616 ROUND - swap
v varvol - ENABLED ACTIVE 512007615 ROUND - fsgen

1> From grub prompt, I booted system from root(hd0,0), system can boot up. Then I tried to boot system from root(hd1,0), system can boot up. Finally, I shudown system and pysically disconnect disk hd0 to see whether system can boot from alternate disk hd1 when hd0 failed. As a result, system failed to boot and I must manually boot hd1 from grub prompt.

========= One part taken from /boot/grub/menu.lst ===========
#vxvm_root_START ( do not remove)
title RHEL4-vxvm_root
root (hd0,0) <<=== I found grub will boot from hd0.
kernel /boot/vmlinuz-2.6.9-55.ELsmp root=c700 ro rhgb quiet
initrd /boot/VxVM_initrd.img
#vxvm_root_END ( do not remove)

2> I checked vfs4.1 manual fo linux. It told me that I must configure bios to boot alternate disk other than the default boot disk. But I think grub will try to boot from hd0 which is the default boot disk. If hd0 failed, then system can not boot up even though I set boot sequesnce under bios.

========= Taken from vfs4.1 manual ===============
Note For information on how to configure your system BIOS to boot from a disk other than the default boot disk, refer to the documentation from your hardware vendor.

Is there anyone to succeed to configure root mirror under linux by veritas volume manager? If yes, pls advise me how to configure grub or bios to make system can boot from alternate disk when the default boot disk failed. Thank you.

PS: I know it is better to configure root mirror during os installation.
I just want to test veritas volume manager + RHEL4.


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