[pve-devel] Default cache mode for VM hard drives

[Alexandre DERUMIER]

>>Also, another recommendation of IBM (redbook) to gain speed of disk access 
>>in the VMs consist in use LVM as device block and not files of images of 
>>disk 

Well, this really depend of storage implementation of iscsi or nfs.

I have netapp storage with nfs, and I can reach same speed (iops or bandwith) than iscsi with zfs ;)


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

De: "Cesar Peschiera" <brain at click.com.py> 
À: "datanom.net" <mir at datanom.net>, pve-devel at pve.proxmox.com 
Envoyé: Vendredi 21 Novembre 2014 17:34:28 
Objet: Re: [pve-devel] Default cache mode for VM hard drives 

No only for DRBD, for any VM that dependent of a storage with a filesystem. 

And the recommendation is of IBM (redbook) 

Also, another recommendation of IBM (redbook) to gain speed of disk access 
in the VMs consist in use LVM as device block and not files of images of 
disk (for have minus layers intermediate between the VM and the data of 
disk, for example a file system that have files as "raw" , "qcow2" , "vmdk" 
, or some other format of file of image of disk) 

----- Original Message ----- 
From: "datanom.net" <mir at datanom.net> 
To: <pve-devel at pve.proxmox.com> 
Sent: Thursday, November 20, 2014 6:58 AM 
Subject: Re: [pve-devel] Default cache mode for VM hard drives 


> On 2014-11-20 10:29, Cesar Peschiera wrote: 
>> 
>> I forgot to ask you if you have configured the I/O Scheduler as 
>> "deadline" in PVE, and "noop" for your Linux VMs, this combination is 
>> very important. 
>> 
> Is this a general recommendation or only for DRBD? 
> 
> -- 
> Hilsen/Regards 
> Michael Rasmussen 
> 
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