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 <[EMAIL PROTECTED]> 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 > > -- > Linux-cluster mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/linux-cluster > > > > > ______________________________________________________________________ > Ask a question on any topic and get answers from real people. Go to > Yahoo! Answers. > -- > Linux-cluster mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/linux-cluster
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