[linux-lvm] getting pe_start right
mbroz at redhat.com
Fri May 6 15:16:43 UTC 2011
On 05/06/2011 04:55 PM, Phillip Susi wrote:
> While trying to convert my mdadm raid5 array from metadata format 0.9 to
> 1.0, I forgot to specify the version and it defaulted to 1.2, which
> damaged the lvm metadata. After correcting mdadm to 1.0, I decided to
> try to recreate the LVM after managing to locate the volume descriptions
> in the metadata after manually dumping it.
> The problem I now have is that pvcreate will not use the same pe_start
> as before. It was 384 and it is now 3072. I tried using --metadatasize
> 192k --dataalignmentsize 0 and it did not help. What gives?
Try to set
default_data_alignment = 0
# Default alignment of the start of a data area in MB. If set to 0,
# a value of 64KB will be used. Set to 1 for 1MiB, 2 for 2MiB, etc.
Also, if you use
pvcreate --uuid <pv uuid from metadata> --restorefile <old VG backup>
it should create PV exacltly as needed for olf VG (with --restorefile it uses
offset from metadata backup, overriding default)
Then vgcfgrestore and you should have exactly the same cfg.
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