[Linux-cluster] Re: Does GFS support MD multi-device in a two node cluster?
smartjoe at gmail.com
Thu Jul 13 08:18:41 UTC 2006
Thank you very much, your information is important to us.
On 7/13/06, Kevin Anderson <kanderso at redhat.com> wrote:
> On Thu, 2006-07-13 at 02:34 +0800, jOe wrote:
> > On 7/11/06, jOe <smartjoe at gmail.com> wrote:
> > Hello All,
> > We want to confirm that GFS support SCSI based MD multi-device
> > configuration?
> > Server: HP dl380g4 x 2, each has 4-port additional array
> > adapter installed
> > Storage: HP MSA500g2, SCSI array disk system, has 4-port
> > option installed, support 4 SCSI cable connect to this
> > system.(4 individual physical server or two server with dual
> > SCSI path.)
> > OS: RHEL4U3
> This storage won't work well with GFS. GFS requires you are able to
> have concurrent access to the storage devices from more than one machine
> at the same time. The SCSI bus will lock out other accesses for periods
> of time when a node is reading or writing to the file system. The
> storage is fine in a failover configuration, but GFS will pound it and
> it will not survive.
> > We've already deployed RHCS on it (without GFS) and use
> > linux's MD multi-device for SCSI multi-path. (merge two lun
> > path from the disk array to single failover path. /dev/sda
> > +/dev/sdb ->/dev/md0)
> > Question: Can we deploy GFS on such hardware configuration and
> > is it possible to create GFS on MD multi-device ? Any pros and
> > cons?
> It is possible to create GFS on an MD device as long as you are only
> using it for multipath. The preferred solution is to use device mapper
> multipathing rather than md in these configurations.
> The bigger problem is the type of storage and connectivity you are
> using. You will not be happy with the performance you get from the
> storage when using GFS.
> Linux-cluster mailing list
> Linux-cluster at redhat.com
Senior Linux Solution Architect
LinuxTea Professional Group
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