[Users] Re: NFS stall problem

[Rafael Ruiz]

Hello, NFSv3 is know to have stability issues on linux, so by default it 
uses NFSv2 wich is more stable but doesn't support files large than 2GB. 
As I can see you are using NFSv3. I would recommend you to Try using 
NFSv4, the link 
http://wiki.linux-nfs.org/wiki/index.php/General_troubleshooting_recommendations 
would help on setting this up.

This would help too 
http://www.citi.umich.edu/projects/nfsv4/OLS2001/tsld004.htm

I hope this help.

Best regards,

> Hello,
>
> we're currently using openvz (2.6.18-128.2.1.el5.028stab064.4) on debian lenny nodes, with debian lenny or etch VE (kernel was alienized from latest openvz rpm).
>
> We have an nfs server on a hardware node (so NOT in a VE) which shares some cartographic datas (means: LOT of small files, aka tiles).
>
> For now, we're mounting NFS shares in VE in this way :
> nfs-server:/path/to/share on /path/to/mount/point type nfs (ro,nfsvers=3,rsize=32768,wsize=32768,hard,proto=tcp,timeo=600,retrans=2,sec=sys,addr=nfs-server)
>
> Share is done as follow :
> /path/to/share     IP(ro,all_squash,anongid=65534,sync,no_subtree_check)
>
> Problem :
> sometimes (well, about once a day, or each two days), nfs share seems to be stalled. That means :
> - unable to access datas from VE
> - unable to umount share in VE
>
> The only thing we can do is a restart of the VE.
> As far as I can see, the others VE having an nfs share on the same HN don't have any problem (well, for a while, than it stalls too).
>
> We don't have any logs in syslog nor kern.log, either on HN or in VEs.
>
> NFS-SRV is in a VLAN, and distributes files accross up to 3 VLANS. firewall rules are correct...
>
>
> Any idea ?
>
> I've read on wiki that "it's better to mount nfs share on HN, then use a mount -o bind". We can't afford that, as we need to move VE quiet often, and this without shutting them down (vzmigrate --online)...
>
> Thank you in advance.
>
> Best regards,
>
> C.
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