[pve-devel] qemu : add disk option for physical/logical block (could improve windows guest performance wit ceph)

[Alexandre DERUMIER]

>>but all Windows >= 8 or >= 2012 support it for sure, so we could enable it for 
>>those. 
yes indeed.

>>If I read the table correctly then 512e is even "more" supported (older 
>>ones with service pack or KB) as 4K native. 

I don't known if we can switch an existing disk without need to reformat ? 
maybe 512e will work (logical 512, same than 512n)?


>>Some benchmarks would be great/interesting, and naturally a patch too :-) 
I have some heavy mssql databases on my ceph nvme cluster,I'll try to bench them.
I'll send a patch today or tomorrow.




----- Mail original -----
De: "Thomas Lamprecht" <t.lamprecht at proxmox.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>, "aderumier" <aderumier at odiso.com>, "dietmar" <dietmar at proxmox.com>
Envoyé: Jeudi 16 Mai 2019 08:47:22
Objet: Re: [pve-devel] qemu : add disk option for physical/logical block (could improve windows guest performance wit ceph)

On 5/16/19 8:40 AM, Alexandre DERUMIER wrote: 
>>> Sounds like a good idea. Maybe we can even set a better default (512e)? 
> 
> don't seem to works with all windows version (including KB on some versions) 
> https://support.microsoft.com/en-us/help/2510009/microsoft-support-policy-for-4k-sector-hard-drives-in-windows 

but all Windows >= 8 or >= 2012 support it for sure, so we could enable it for 
those. If I read the table correctly then 512e is even "more" supported (older 
ones with service pack or KB) as 4K native. 

Some benchmarks would be great/interesting, and naturally a patch too :-)