[PVE-User] Understanding write caching in proxmox

Pongrácz István pongracz.istvan at gmail.com
Tue Feb 4 15:39:11 CET 2014

How about your NFS setup? Sync, async?


----------------eredeti üzenet-----------------
Feladó: "Chris Murray" chrismurray84 at gmail.com 
Címzett: "Alexandre DERUMIER" aderumier at odiso.com 
CC: pve-user at pve.proxmox.com 
Dátum: Tue, 4 Feb 2014 14:14:51 -0000
> Sorry, I might have misled you with my question. It might have the appearance of 
> another general and possibly quite common one. 
> My troubleshooting was performed on the proxmox *host*, therefore I was under 
> the impression that cache=[whatever] wouldn't make a difference since that's a 
> property of a virtual machine disk.
> For the *VM*, I'm using writethrough .. however I'm observing exactly what you 
> explained for 'none' or 'writeback'. My VM is Windows Server 2008 R2, and I'm 
> using sdelete to fill it with data. 'sdelete -z' won't appear on the 'zpool 
> iostat' for quite some time, while the cached figure on the proxmox host 
> increases. That's despite the disk being set to writethrough.
> Apologies if I'm not being clear.

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