Re: -z not on RAID0 / MPIO hurdle

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

mark delfman <markdelfman@googlemail.com> writes:

> Hi.... I am hopeful that the group could provide me with some advice
> regarding limiting the drive size on a RAID0.  I know and use the –z
> option for other raid levels, but this seems to have no effect on
> RAID0.
>
> I am sure many will ask ‘why bother’ or ‘use fdisk’ but the problem is:
>
> We need to have some preserved information on each drive – can be only
> a few MB at the end of the drive for example
> In the past we have simply used Fdisk to partition, save our data on
> Sdx2 and used Mdadm on Sdx1  (which works fine)
> But we are looking to move to dual channel SAS drives and use DM MPIO
>
> DM MPIO works fine also, but not on the partitions, only the whole
> drive.  So when we MDadm DMx it overwrites the SdX2 partition etc.
>
> The answer was that we used the –z and limited the drive size and
> simply used DD to write our data to the end LBA’s....
>
> But on RAID0 the –z does not seem to function, so I cant think of a
> way around this   (other than changing the LBA range in the drive and
> this is restricted I think)
>
>
> Does anyone have any ideas?  I appreciate any help

LVM and --setphysicalvolumesize on pvcreate?

MfG
        Goswin
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