[pve-devel] LXC volumes on ZFS over iSCSI

[Alexandre DERUMIER]

>>Start/activate:
>>  New view
>>  Foreach node:
>>    iscsiadm --session --rescan

>>stop/deactivate:
>>  Remove view
>>  Foreach node:
>>    echo 1 > /sys/bus/scsi/devices/${H:B:T:L}/delete (Where H = host:B
>>= bus:T = target:L = lun) 


I'm afraid of behaviour if a node is not joinable to do the delete or rescan.
Seem to be difficult to manage with big cluster.
I'm curious to see result of:


Start/activate: (PVE::Storage::activate_volume)
echo "c t l" > /sys/class/scsi_host/hosth/scan

stop/deactivate: (PVE::Storage::deactivate_volume)
echo 1 > /sys/bus/scsi/devices/${H:B:T:L}/delete


----- Mail original -----
De: "datanom.net" <mir at datanom.net>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Lundi 10 Octobre 2016 21:31:51
Objet: Re: [pve-devel] LXC volumes on ZFS over iSCSI

On Mon, 10 Oct 2016 22:12:56 +0300 
Dmitry Petuhov <mityapetuhov at gmail.com> wrote: 

> We could rework iscsi-manipulation code into another behavior. For exmaple, Dell PS-series SAN exports each volume in separate target, lun 0. So we can login into this target in activate_volume() and logout in deactivate_volume(). See my plugin for these storages: https://github.com/mityarzn/pve-storage-custom-dellps 
> Also, there's note about bug in debian's multipath-tools in plugin's README. 
> 
> That way we can have LUNs only on hosts, where they're needed. Except some cases where PVE does not call deactivate_volume() for some reason (I think these are bugs?). 
> 
I think this is bad hack. A target for each Lun will mean 100's or even 
1000's of targets. I am quit convinced that my idea can be implemented 
and I think that is, IMHO a much more clean solution. 

My solution: 
Create: 
New volume 
New lun 

Start/activate: 
New view 
Foreach node: 
iscsiadm --session --rescan 

stop/deactivate: 
Remove view 
Foreach node: 
echo 1 > /sys/bus/scsi/devices/${H:B:T:L}/delete (Where H = host:B 
= bus:T = target:L = lun) 

Remove: 
Delete Lun 
Delete volume 

-- 
Hilsen/Regards 
Michael Rasmussen 

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