[linux-lvm] shift PV from disk to raid device?
Stuart D. Gathman
stuart at bmsi.com
Tue Dec 9 21:03:36 UTC 2008
On Tue, 9 Dec 2008, Kai Schaetzl wrote:
> > The solution to this problem is to create the raid device with a
> > superblock format of 1.1 or 1.2 (aka, -e 1.1 or -e 1.2).
> Is this an option to mdraid? mdadm --create --help doesn't show me this
> option. Might mdadm-2.6.4-1.el5 on 5.2 be too old? Or is this an option to
I don't think changing the raid superblock will help. I generally
prefer having the superblock at the end - there are times when you
*do* want sda3/sdb3 to alias md3:
o many versions of grub will not install on md? - you have to unmount /boot,
break mirror, mount sd? on /boot, install grub, unmount /boot, mount md? on
/boot again, add back mirror copy of /boot.
o Also, when recovering a system, it is helpful to be able to mount a
partition directly, without setting up the raid devices. I've had customers
remove a mirror copy and mail me the disk. I can then mount the filesystems
directly, while they keep operating.
The key is breaking the aliasing and copying the data to a proper md? PV.
Stuart D. Gathman <stuart at bmsi.com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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