[pve-devel] Fwd: Re: recommanded cache setting for rbd image

[Alexandre DERUMIER]

>>Is this in guest or the host/node? 
in the guest

>>If default filesystem is EXT4 or XFS then you don't need to worry since 
>>EXT4 and XFS has barrier enabled by default. 

depend of you kernel version (But yes it was some time ago)
XFS since 2.6.16	1
ext4 since 2.6.26

and virtio drivers only since 2.6.32 .... (but qemu 1.2 can detect now if virtio support flushes)


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

De: "Michael Rasmussen" <mir at datanom.net> 
À: pve-devel at pve.proxmox.com 
Envoyé: Mardi 6 Novembre 2012 19:07:33 
Objet: Re: [pve-devel] Fwd: Re: recommanded cache setting for rbd image 

On Tue, 06 Nov 2012 18:58:23 +0100 (CET) 
Alexandre DERUMIER <aderumier at odiso.com> wrote: 

> But user really need support for barrier with kernel < 2.6.37, or it can really break things,and it's really depend of his guest setup. 
Is this in guest or the host/node? 

If default filesystem is EXT4 or XFS then you don't need to worry since 
EXT4 and XFS has barrier enabled by default. 

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Michael Rasmussen 

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