ISCSI Question

O

Oer2001

Member
Jul 12, 2011
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Hi,

we use proxmox with a shared iscsi target.
What is the default behaviour, if the iscsi connection is going down?
In our configuration all vm's crash immediately.

I saw other kvm configurations where the vm's freeze when the target was not accessible and came back after connection was recovered.

Thank you for your answer.

Regards,
Erik
 
I assume a VM which looses the disk will crash always. I did not see the opposite, but if you tell details how this should work I will take a look on it.
 
The default setting is to report errors to the guest (rerror=report). Maybe you want to set that to 'rerror=stop' instead (pause qemu).
 
Hi,

where can I set 'rerror=stop'?? Which configuration file??
I found another way, thats ok for me.
I set up multipath and configure

no_path_retry queue
flush_on_last_del no

The VM freeze and start working after ISCSI reconnection.
I think the max. queue time is round about 6 minutes.

Regards,
Erik
 
Hello,

I have a storage cluster with two machines (drbd, heartbeat, iscsi target).
If the active machine crashes there are round about 3 seconds until the passive machine takes over.

In this time the running machines seems to freeze but works again if the passive machine got active.
So I guess the IO requests are buffered somewhere

So with a network backed storage I recomend to have a failover scenario.
Elsewhere it would be the same you pluck out harddisk of a bare metal machine while it's running.

Best regards

Ben
 
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