[Novalug] LVM query
James Ewing Cottrell 3rd
JECottrell3 at Comcast.NET
Wed Jul 21 15:27:54 EDT 2010
On 7/19/2010 9:08 PM, Brander Snaxe wrote:
> What is the first track problem you mention? Is this something to do with LVM alignment? I have read about this before when dealing with filesystem alignment with RAID5 stripes. Also it comes into play with LVM. And it always comes into play with SSD drives apparently.
> [[[I assume that for plain LVM or for LVM+RAID (no striping) that the mis-alignment problem would be so negligible that worrying about is moot.]]]
> Just curious.
> Also, for anybody using LVM with XFS, forget about it unless you have a battery backed controller. LVM ignores barrier/nobarrier options on top of software RAID (at least it did when I last tried about 6 months ago).
OOPS! I forgot to comment on part of your post, the part [[[I marked
Yes, the alignment doesn't really matter in the LVM/RAID case, but if
you ever try cloning your partitions via DD, assuming equal partitions
sizes, you will be able to copy P1 to Pn, but not vice versa.
I don't normally do that except to back up my Windows partition. Crude,
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