[Users] Re: NFS stall problem

[Gordan Bobic]

NFSv2?! You are joking, right? NFSv3 has been stable for over a decade. 
Last time I saw NFSv2 in the wild was in the '90s.

If you said NFSv4 was unstable, that I might have been inclined to agree 
with.

Gordan

Rafael Ruiz wrote:
> 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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