[sheepdog-users] WARN wait_forward_request messages

[Andrew J. Hobbs]

I've seen this situation, but it's specifically happened not due to 
connectivity, but due to disk/raid configuration/raid controller not 
performing well.  In my case, Perc 7 raid controller + btrfs + raid 5.  
The situation has improved dramatically since rebuilding the worst 
offender to Perc 7 each drive exposed as a raid 0 drive + ext4 + 
sheepdog md.

On 10/11/2014 08:27 AM, Maxim Terletskiy wrote:
> Hi!
>
> I see similar messages in log:
>  WARN [gway 18794] wait_forward_request(413) poll timeout 1, disks of 
> some nodes or network is busy. Going to poll-wait again
>
> Some of nodes have Infiniband for IO connection. This nodes have much 
> less warnings in logs(0-10 per day with IB, 10-20 per hour without 
> IB). So looks like the problem is in network. But after couple of days 
> monitoring network activity with vnstat I can't see any traffic peaks 
> which could be the reason of this messages.
>
> Where can be the bottleneck?
>
> All my nodes with data using IB, all my nodes with VMs working in GW 
> mode and using object cache. Sheep version 0.8.0.

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