[CentOS] NFS v4
jfigarella at vecna.com
Wed Jun 6 16:14:03 UTC 2007
Les Mikesell wrote:
> Jean Figarella wrote:
>>>> Under real user load though it just fell on its arse very
>>>> quickly and a quick fall back to v3 was implemented. Maybe the
>>>> EL5 implementation behaves better?
>>> I use one of my CentOS 5 boxen for low-load fileserver with
>>> NFS4. I've been noticing that although MP3s plays fine from
>>> that box, it can take a minute or two to write a dozen
>>> tags--something that should happen in the blink of an eye. I've
>>> been wondering what the problem is. Maybe it's NFS4!
>> I've been experiencing 5 to 20 seconds freezes ever since I upgraded
>> my nfs server. This serves about 30 people. Anytime someone writes a
>> big file to their home directory, the freezes happen. You can
>> experience the freezes when browsing the internet, I guess because
>> firefox is constantly writing data (cache, cookies, etc...). Other
>> apps freeze up too.
>> Now the question on my side is: can I force centos4 for serve nfs3 as
>> opposed to nfs4. If I am not mistaken this is dependent on the client?
>> The reason Im asking is that if I can force the server to serve nfs3
>> then the clients will default to nfs3 themselves. right?
> Are these mounted with the sync or async option? If it is sync, the
> client waits for the physical flush to disk to happen on every
> operation, something that is horribly slow and that you never do for
> local disks except for transaction boundaries in databases and other
> unusual situations.
At first the sync option was being used, and the freezes happened very
frequently. About a month and a half ago I started using async, and now
I get far fewer freezes, like maybe 3 in an 8hr span.
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