On 20 Feb 2009 at 10:19, Konrad Rzeszutek wrote:

> 
> > Maybe that's related: With SLES10 SP1 (x86_64) I have two iSCSI LUNs that 
> > are 
> > reachable over 16 paths each, and the networ connections use two dedicated 
> > separate VLANs. As it's a test at the moment, there's only one initiator 
> > and two 
> > iSCSCI gateways connected to that switch. And there is no traffic (the 
> > filesystem 
> > is a RAID1 that is not mounted). Still I'm seeing message like this:
> > 
> > Feb 19 01:39:50 rkdvmso1 iscsid: connection198:0 is operational after 
> > recovery (
> > 1 attempts)
> > Feb 19 07:49:30 rkdvmso1 iscsid: connection215:0 is operational after 
> > recovery (
> > 1 attempts)
> > Feb 19 08:53:15 rkdvmso1 iscsid: connection208:0 is operational after 
> > recovery (
> > 1 attempts)
> > Feb 19 14:09:40 rkdvmso1 iscsid: connection211:0 is operational after 
> > recovery (
> > 1 attempts)
> > Feb 19 19:33:42 rkdvmso1 iscsid: connection220:0 is operational after 
> > recovery (
> > 1 attempts)
> > Feb 20 01:43:56 rkdvmso1 iscsid: connection210:0 is operational after 
> > recovery (
> > 1 attempts)
> 
> It looks as if each path gets bumped. Is there anything related in the target 
> around those times? Did you see a pattern over a long time of which path and 
> what
> time they are being bumped?
> 
> Also, are there any backup being done over that time-frame that would saturate
> the switches?

Hi!

I'll have to investigate a bit deeper. If it's not the network, it could be FC 
or 
the target hardware itself. There are some backups actually running, some of 
those 
I'm responsible for, and others I'm not responsible for, but they use the same 
infrastructure, and even others that only use the FC ISL (Inter-Switch-Links) 
for 
data transport. However we were believing that FC guarantees maximum delays and 
no 
packet drops, so I dobt that it's the FC, but who knows? I'll have a deeper 
look, 
comparing it to the backup times I know...

Regards,
Ulrich



> 
> > 



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