[PVE-User] Bug in Cache options ZFS over ISCSI?

Steffen Wagner mail at steffenwagner.com
Thu Sep 3 13:12:36 CEST 2015


Hi Michael,

thanks for that explanation. So the writeback flag in Proxmox is then 
using the guests RAM to cache disk writes?

Thanks,
Steffen

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Am 2015-09-02 23:45, schrieb Michael Rasmussen:
> On Wed, 2 Sep 2015 14:53:47 +0200
> "Steffen Wagner" <mail at steffenwagner.com> wrote:
> 
>> 
>> I am using nappit and Proxmox for ZFS over ISCSI.
>> 
>> When I create a VM and set writeback cache, the option inside napp it 
>> is
>> correctly set.. but if I change it later to none or again back, the 
>> values
>> are not transmitted to nappit.
>> 
>> 
> You are mixing to different options. Cache can be configured both on
> iSCSI level and on VM level. Cache on iSCSI level is configured on a
> storage basis (storage view in Proxmox) which means this setting is
> affecting all new VM's while cache on the VM level is affecting only
> the specific VM. What you can see in napp-it is the cache setting on
> iSCSI level while the cache setting on VM level is only used as an
> option when starting the VM in proxmox.
> 
> I hope the above explanation makes sense?
> 
> --
> Hilsen/Regards
> Michael Rasmussen
> 
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