[pve-devel] high load on LV remove and iSCSI

[Alexandre DERUMIER]

sorry,I'm using a netapp fas2420, but through nfs (with a custom plugin to manage snapshot/clone/....) 


Netapp have a good nvram write cache (like on zfs), so write are really fast, I don't see how a lvm delete could hang.


Maybe it's a problem client side ? 
	

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

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: pve-devel at pve.proxmox.com 
Envoyé: Jeudi 26 Juin 2014 06:37:57 
Objet: [pve-devel] high load on LV remove and iSCSI 



Hi all, 

one user reported very high load when he removes a disk which resides on LVM on top of iSCSI. 
The storage backend is a netapp FAS2020. 

Anyone seen that? 

What can cause such high loads. Looking at the LVM source code reveals that LVM only wirtes 
a few bytes of metadata, so this cannot cause the load. Any ideas? 


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