Re: [Xen-users] Xen hypervisor and HDDs with 4K sectors

[Peter Milesson <miles@xxxxxxxx>]

On 2019-05-26 15:28, Simon Hobson wrote:
> > I want to use the most modern hardware possible, and in line with that, I would 
> > like to have the option to use HDD (or SSD) drives with 4K sectors through a 
> > hardware RAID controller.
> >
> > I have been searching information about Xen and support for drives with 4K sectors, but I 
> > haven't seen much information on the subject. I would be sincerely 
> > "dissappointed" if I purchase a new server for 10000+ USD, only to discover it 
> > to be utter useless.
> It shouldn't matter.
> As long as the hardware is supported in Xen/Dom0, and you partition on 4k 
> boundaries, then the guests should be isolated from the underlying details. 
> Obviously it would be a good idea to also partition any virtual drives on 4k 
> boundaries (if partitioning in the guests).
Hi Simon,

Thanks for your input. That's the point. I have seen a few posts that 
the advanced disk format using 4K sectors is not compatible with Xen. 
RedHat/CentOS (which I'm planning to use) has got support from ver. 6.1. 
I'm planning to use a HPE server, and there is no information whether 
they supply 4K disks, except in a few cases, which are 512e (4K disks 
emulating the classic sector size of 512 bytes). One may assume, that a 
manufacturer like HP isn't supplying ancient technology, but better safe 
than sorry.
Best regards,

Peter


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