[linux-lvm] Does a striped LV honor the order of specified PVs

[linux-lvm] Does a striped LV honor the order of specified PVs

[John Anthony]

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All:

This is situation where the number of LUNS - spindles - are many with the
LV striping across all of them.

To avoid hotspots - the idea is to control the order in which the LUNs are
written to by the LVs. It would appear the specifying the underlying PV -
LUN - order would achieve this goal. Is that correct ? Is there any value
to going through that trouble ? any experiences ?

TIA,

-JAC

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Re: [linux-lvm] Does a striped LV honor the order of specified PVs

[Peter M. Petrakis]

On 03/08/2012 01:41 PM, John Anthony wrote:
> All:
>
> This is situation where the number of LUNS - spindles - are many with the
> LV striping across all of them.
>
> To avoid hotspots - the idea is to control the order in which the LUNs are
> written to by the LVs. It would appear the specifying the underlying PV -
> LUN - order would achieve this goal. Is that correct ? Is there any value
> to going through that trouble ? any experiences ?

Well striping in general is a "good thing" for performance it's just a matter
of how you want to implement it. Yes, LVM can create striped volumes, you could
also create a software RAID array [1] to act as your physical volume and
achieve the same goal. There's copious material available on the topic of RAID
striping.

Peter

1. or buy a HW RAID, or a SAN.

>
> TIA,
>
> -JAC
>
>
>
>
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