[Linux-cluster] Re: Does GFS support MD multi-device in a two node cluster?

[jOe]

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.
>
> Kevin
>
> >
>
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>



-- 
Joe Yu
Senior Linux Solution Architect
LinuxTea Professional Group
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