[Ocfs2-users] bug resolve yet for export OCFS2 volume to NFS client ?

[Sérgio Surkamp]

Hello,

Sorry, my mistake. We have installed the Oracle Unbreakable Kernel on
top of CentOS 5.5.

About running it into production, we have a two node setup (and will
be expanded to four nodes until June 2011) since January 2011 without a
single issue, but this new cluster has no NFS shares. The cluster serves
web content and e-mail using Maildir+ format.

One thing to consider when using Unbreakable and iSCSI storage. It
seems that the multipathd on top of two iSCSI initiators "trick"
doesn't work on newer kernels. We are using bounded interfaces and one
initiator on top of the teamed device instead.

Regards,
Sérgio

Em Tue, 22 Mar 2011 16:32:05 +0100
Nikola Savic <niks at logik-internet.rs> escreveu:

> 
>   Hi,
> 
>   Do know if there any known issues if Oracle Unbreakable Linux is
> installed on top of Centos5.5?
> 
>   Does anyone have any experience in installing Oracle kernel
> packages on Centos in production environment?
> 
>   Thanks,
>   Nikola
> 
> Sérgio Surkamp wrote:Hi,
> 
> Our NFS setup is running stable since we have disabled READDIRPLUS on
> our FreeBSD clients. The OCFS2 cluster servers are with about 200 days
> of uptime now and last reboot was to upgrade the kernel version.
> 
> As a general recommendation, I suggest you to use the Oracle's
> Unbreakable Linux kernel on top of CentOS 5.4 (or RedHat EL 5.4) and
> OCFS2 1.6, also provided by Oracle, to avoid the known fragmentation
> bug and to be able to enable the indexed directories feature for
> improved performance.
> 
> If you are using only Linux NFS clients, you can try running with
> READDIRPLUS enabled, but maybe you experience the same bug as FreeBSD
> NFS client and disabling the READDIRPLUS call is the only known way to
> avoid the problem.
> 
> To install the Unbreakable, fallow the instructions provided by Oracle
> on its yum repository:
> 
> http://public-yum.oracle.com/
> 
> Regards,
> Sérgio
> 
> Em Tue, 22 Mar 2011 14:52:11 +0800
> Thomas Lau <thomaslau at esun.com> escreveu:
> 
>   I found this from ocfs1.4 document:
> g) NFS
> OCFS2 volumes can be exported as NFS volumes. This support is limited
> to NFS version 3, which translates to Linux kernel version 2.4 or
> later. Users must mount the NFS volumes on the clients using the
> nordirplus mount option. This disables the READDIRPLUS RPC call to
> workaround a bug in NFSD, detailed in the following link: 
> http://oss.oracle.com/pipermail/ocfs2-announce/2008-June/000025.html
> Users running NFS version 2 can export the volume after having
> disabled subtree checking (mount option no_subtree_check). Be warned,
> disabling the check has security implications (documented in the
> exports(5) man page) that users must evaluate on their own.
> 
> is it being fixed with centos 5.3 (2.6.18-164.11.1.el5)?
> 
> anything I need to aware for exporting OCFS2 volume via NFS?
> 
>     
> 
> 
>   



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