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Re: [linux-lvm] lvm and md



Jon Bendtsen wrote:
Peter Yao wrote:

Should we build lvm volumns on top of soft raid(md) or build md on top
of lvm volumns?
I prefer to build md on top of lvm volumns because lvm can hide the
hardware details from md. Just want to know how do you think about this.
Or any URLs? Thanks.


why would you need to hide the hardware details from md ?
I am using some hot-plugging disks and their device number may change after reboot. For example, if i build md with /dev/sda and /dev/sdb, after reboot md may cannot start because the two disks' device name change to /dev/sdc and /dev/sdd. If i build md on top of lvm this problem is avoided. Can you give me some advice for this issue?

The way i do it is to md 2 disks together into a pair, and
then pvcreate it and add it to my VG. That way i can get more and more disks into the system. I have thought about
creating 2 VG's, and then run md ontop of that, but it's more
work, as you would have to resize 2 LV's, and besides, a harddisk
failure might trash one of your VG's. Meaning more repair work.




JonB

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--
Peter Yao




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