Re: LVM and Raid5

[Goswin von Brederlow <goswin-v-b@web.de>]

"Majed B." <majedb@gmail.com> writes:

> Hello,
>
> I'm the one who ran those tests with LVM vs. RAID5 and I think I have
> faced speed difference because I have disks of varying speeds
> (different models and vendors), and I believe that LVM gets crippled
> down to the speed of the slowest disk.
>
> On Wed, Sep 16, 2009 at 1:09 PM, Goswin von Brederlow <goswin-v-b@web.de> wrote:
>> Linux Raid Study <linuxraid.study@gmail.com> writes:
>>
>>> Hello:
>>>
>>> Has someone experimented with LVM and Raid5 together (on say, 2.6.27)?
>>> Is there any performance drop if LVM/Raid5 are combined vs Raid5 alone?
>>>
>>> Thanks for your inputs!
>>
>> Has always worked perfectly for me and i can't say I noticed any
>> performance change.
>>
>> MfG
>>        Goswin

But the question was raid5 vs lvm+raid5. The raid5 gets cripled down
to the slowest disk and speeds up due to striping. The LVM should not
have any noticeable effect on top of that.

MfG
        Goswin
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