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

[Steffen Wagner]

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"  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?

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

[Michael Rasmussen]

On Wed, 2 Sep 2015 14:53:47 +0200
"Steffen Wagner"  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

Get my public GnuPG keys:
michael  rasmussen  cc
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--
/usr/games/fortune -es says:
HOW YOU CAN TELL THAT IT'S GOING TO BE A ROTTEN DAY:
#15 Your pet rock snaps at you.


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

[Steffen Wagner]

Hi,

 

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.

 

May this be a bug?

 

Thanks + regards,

Steffen

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