[Linux-cluster] fcntl locking lockup (dlm 1.07, GFS 6.1.5, kernel 2.6.9-67.EL)

[Kevin Anderson]

Sorry, Lon gave me updated info about the MSA500.  It isn't a parallel
shared scsi bus configuration, so might work with gfs.  However, we have
never run with it before and not sure about the performance
characteristics.

Kevin

On Wed, 2008-01-09 at 12:56 -0800, Coman ILIUT wrote:
> We're using an MSA500 actually, so what you're saying is that we're
> not using the proper hardware for GFS.
> Can you tell us how bad is this? The reason I'm asking is because we
> are already at the second version of our product using this solution
> and we did not have any issues before. So we never considered the
> hardware to be an issue.
> 
> When we picked this solution, HP presented MSA500 as being able to do
> concurrent access to files (of course there's some serialization
> inside, there's only one set of reading heads in the hard disk). Also,
> HP DL360 have the ILO interface, which is supported by GFS.
> 
> The difference now is that we are using file locking heavily and we're
> using files in multi-access mode. Everything seems to work fine,
> except for the locking.
> 
> Coman
> 
> Kevin Anderson <kanderso at redhat.com> wrote:
>         On Tue, 2008-01-08 at 22:39 -0500, Charlie Brady wrote: 
>         > On Tue, 8 Jan 2008, Gordan Bobic wrote:  > Charlie Brady wrote: > > On Fri, 4 Jan 2008, Charlie Brady wrote: > >  > >> I'm helping a colleague to collect information on an application lockup  > >> problem on a two-node DLM/GFS cluster, with GFS on a shared SCSI array. > >> > >> I'd appreciate advice as to what information to collect next. > > 
>         >  > > Nobody have any advice? >  > Shared SCSI as in iSCSI SAN or as in a shared SCSI bus with two machines  > connected via a SCSI cable?  The latter. I don't have the details immediately at hand, but it's all HP  gear. A pair of DL380s with an external SCSI array (MSAxx), IIRC.  
>         If it is a MSA20, MSA30 or MSA500 - they won't work with GFS.
>         Shared SCSI bus isn't really shared, accesses lock the bus
>         such that when one node accesses the storage the other node is
>         locked out.  GFS requires the ability to do shared concurrent
>         access to the storage devices.  This probably explains the
>         hangs you were seeing.  So, either get an iSCSI or fibre
>         channel storage array, or go strictly with a failover storage
>         architecture, such that only one node has the filesystem
>         mounted at any one time.  In that case, you don't need gfs
>         anymore, just cluster suite to manage the failover.
>         
>         Kevin
>         
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> 
> 
> 
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