Re: NFS rename sometimes hangs for 15 seconds after upgrade to Debian 8
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Am 24.09.2015 um 11:46 schrieb Vincent Lefevre:
> On 2015-09-23 17:56:30 +0200, Peter Ludikovsky wrote:
>> When mounted as NFS3 over UDP: - ---- root@lab1# echo foo >
>> file1 root@lab1# cp file1 file2
>>
>> root@lab2# cat file2 foo
>>
>> root@lab1# time mv file1 file2 real 0m0.004s user 0m0.000s sys
>> 0m0.000s - ----
>>
>> Same with NFS4 over TCP: root@lab1# time mv file1 file2 real
>> 0m0.005s user 0m0.000s sys 0m0.000s
>>
>> Any special mount options or export options you might be using?
>
> Here this is NFS4 over TCP:
>
> filer.lip.ens-lyon.fr:/export/home/vlefevre on /home/vlefevre type
> nfs4
> (rw,nosuid,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=140.77.14.11,local_lock=none,addr=140.77.14.5)
>
>
>
>
Is there any other information I could get?
>
The most obvious thing: remove the public visible IPs and DNS names.
Other than that, what mount command did you use? Are you mounting the
share yourself, or is this an fstab or autofs mount? Do you have any
control over the NFS server, and if so what are its settings?
I did manage to replicate your issue. However, it disappears as soon
as I sync before the mv, as well as when both the rsize and wsize
parameters are reduced to 65536, suggesting this has something to do
with a local cache and/or lock.
Apparently the issue also disappears as soon as both sides have noac
added to the mount options.
Regards,
/peter
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