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List: linux-lvm
Subject: Re: [linux-lvm] why do striping and mirroring in LVM?
From: Svetoslav Slavtchev <galia () st-peter ! stw ! uni-erlangen ! de>
Date: 2002-06-27 6:19:19
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Quoting lilha@legend.com.cn:
>
>
> i know that lvm support striping now and LVM2 will support mirroring
> directly later this year.
> but i'm puzzled that why lvm do that?
>
> i think the main Goals of LVM are
> 1.Implement a very flexible virtual disk subsystem to handle disk
> storage.
> 2.Online allocation and relocation of storage.
> 3.Online extension and reduction of storage.
> And disk redundancy is the goals of hardware. or software.RAID.
>
> i think software.RAID+LVM is good idea,and that's enough.
it's a good idea cause LVM doesn't support mirroring and is not that good at
stripping, and it would be very good if one could use the featchers without
needing other layer ( soft RAID)
> why LVM focus on the striping and mirroring?
i think every other implementation supports them
> i don't think it's a good idea to do a big and full software.
>
> there are any reasons and advantages to use striping or mirroring LVM
> than
> software.RAID+LVM ?
useing LVM over soft RAID adds extra overhead, is more CPU intensive
> i think the reason is LVM it does not matter where the disks are at
> all.
> We can do the same with two big external storage towers, not just with
> two
> disks.
>
> but i think this reason is not enough, can anyone give me some support?
> and how many people use striping or mirroring LVM£¬not
> software.RAID+LVM£¿
>
>
> TIA for your help and sorry for my poor English.
>
>
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