[PVE-User] Shared storage on NAS speed - LVM(over iSCSI) vs NFS

Michael Rasmussen mir at miras.org
Wed Jul 19 17:38:31 CEST 2017

On Wed, 19 Jul 2017 18:30:01 +0300
Mikhail <m at plus-plus.su> wrote:

> Basically, it looks like MDADM array, and LVM on top (and possibly FS
> inside the VMs) need to be created with manual calculations for
> alignment and these calculations need to be specified on the command
> line at the time of creation. It is pity to find out this now, when
> server is in active use - many manuals mention that MDADM, LVM, etc are
> smart enough these days to make these calculations automatically at the
> time of creation, but this does not appear to be true and that's where
> problems come from later on.
Your problem is that your disks is native 4k which advertises 512b as
well. This means lvm and mdadm got confused ;-)

> I guess my only way to fix this is to migrate everything off that server
> and reinstall it from scratch, throwing away things like MDADM and LVM
> this time and replacing them with ZFS for storage purposes.
You mentioned before that you hoped to use Omnios. Latest stable
now supports your nics.

Michael Rasmussen

Get my public GnuPG keys:
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/usr/games/fortune -es says:
I'm telling you that the kernel is stable not because it's a kernel,
but because I refuse to listen to arguments like this.
		-- Linus Torvalds
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