Does LVM affect performance

[Scott Medling]

I'm using LVM on top of two RAID 5 arrays and the only thing I notice is
that the RAID 5 uses about 1% of my 1.8GHz P4 and I don't see LVM, so it
must use less than that of the CPU.  I can't come up with a logical reason
why it might affect disk IO or RAM usage noticeably (but it has to store
it's information in RAM somewhere).



On 4/12/07, WipeOut <wipe_out at users.sourceforge.net> wrote:
>
> Hi,
>
> Pretty simple questions but probably not such a simple answer..
>
> Does using LVM affect disk and system performnace?
>
> There must be some overhead involved (memory, cpu or disk IO) in using
> LVM but is that overhead measurable or is it insignificant if disk
> throughput is of significance??
>
> Would be interesting to hear your thoughts or from anyone who has tested
> it..
>
> Thanks..
>
>
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