[pve-devel] iothread

[Alexandre DERUMIER]

>>The move disk operation is hitting the same problem as backup with
>>dataplane.

I don't think it's the same problem.

drive-mirror itself it's working, it's the block-job-complete which is failing. (can't rettache the new block device to iothread).
This is fixed in qemu 2.7 (which should be released next week, but maybe we can try to backport the patch which remove opblocker)


for backup, if I remember, this is the copy which is failing.
I need to redo some tests with qemu native backup and iothread to see if it's working fine.



----- Mail original -----
De: "datanom.net" <mir at datanom.net>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Vendredi 19 Août 2016 07:53:27
Objet: Re: [pve-devel] iothread

On Fri, 19 Aug 2016 05:43:52 +0200 (CEST) 
Alexandre DERUMIER <aderumier at odiso.com> wrote: 

> just tested from ceph to ceph, with iothread enabled, indeed it's hanging the qemu process when doing the switch to new disk. 
> data copy itself seem to works. 
> I think this is a qemu bug, it should work. 
> 
The move disk operation is hitting the same problem as backup with 
dataplane. 

> 
> Well, this is the 2 only things that didn't work currently. I don't think it's "useless". 
> Personnaly, I'm using iothread with big databases on ceph, where I need a lot of iops for database journal disk, database datas disk,.... 
> 
I see a usecase for high iops requirement and especially when storage 
is ceph but for enterprise and/or HA usage in generel it is a disaster 
waiting to happen if moving a disk between storage pools is not 
supported and taking backup is not allowed. 

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