[pve-devel] 4k native drives

[Alexandre DERUMIER]

>>Maybe 4Kn can write 4K atomically, while 512e cannot guarantee that? 

I think that if you need to write 512bytes, it'll write the full 4K. So maybe performance are lower than with true 4K.





I have found an post here:

http://comments.gmane.org/gmane.os.solaris.opensolaris.zfs/49253

seagate 7200.14 seem to expose true 4K.



----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Alexandre DERUMIER" <aderumier at odiso.com>, pve-devel at pve.proxmox.com 
Envoyé: Lundi 12 Novembre 2012 12:11:55 
Objet: RE: [pve-devel] 4k native drives 

> I think it's really difficult to find true 4K drives, as windows only support them 
> since win8 and win2012. 
> 
> 
> http://support.microsoft.com/kb/2510009/en-us?fr=1 
> 
> 
> win7 only support 4K drives with 512 emulation. 
> 
> 
> 
> Maybe they will coming in mass this year ? 

Why - what would be the advantage? If you write correctly aligned 512e is as fast as 4Kn? 

Maybe 4Kn can write 4K atomically, while 512e cannot guarantee that?