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

[Alexandre DERUMIER]

Sorry,
I have totally forgot this.

as far I remember, it was improving performance for some workload.

I'll try to do more test again this week.

----- Mail original -----
De: "Jorge Boncompte" <jbonor at gmail.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Lundi 4 Novembre 2019 10:44:44
Objet: Re: [pve-devel] qemu : add disk option for physical/logical block (could improve windows guest performance wit ceph)

El 16/5/19 a las 8:57, Alexandre DERUMIER escribió: 
>>> 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. 

Hi Alexander, did you do benchmarks? Any conclusions you can share? 

Best regards. 

> 
> 
> 
> 
> ----- 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 :-) 
> 
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