[Linux-cluster] partitioning of filesystems in cluster nodes

[RR]

Hi Greg,

Thanks for the input. What you say makes sense, but I was getting these
ideas from places like these: http://kbase.redhat.com/faq/FAQ_78_3105.shtm

Have I totally misunderstood this? Maybe this is saying the same thing as
you are but I understand it wrong? I'm definitely not exporting any of my
local volumes or filesystems to anywhere, all I want to do is have this
particular directory tree which is based in /var/spool to actually be on the
SAN and have all nodes read/write to it at their discretion. Nothing too
complicated. But this FAQ seems to say that if I'm running GFS on my nodes,
then those nodes cannot be running software RAID. Somewhere else I'd read I
can't also have LVM volumes on these disks. What I originally had planned
was to have software raid using md and LVM volumes on each machine to allow
for RAID and resizing on each node and then have GFS. 

I'm all confused now! Please clarify someone?

Thanks, and sorry if this is stupid! :(
RR



-----Original Message-----
From: linux-cluster-bounces at redhat.com
[mailto:linux-cluster-bounces at redhat.com] On Behalf Of Greg Forte
Sent: Thursday, June 22, 2006 3:47 PM
To: linux clustering
Subject: Re: [Linux-cluster] partitioning of filesystems in cluster nodes

Where have you gotten these ideas?  LVM and software raid are not mutually
exclusive with GFS.  Your local disks can easily have LVM volumes and use
software (or hardware) RAID, no problem.  Unless you're trying to export
local disks as GFS volumes via GNDB (which I can't speak to, have never done
that), there shouldn't be any restrictions on how you can configure the
local disks.  If you want certain portions of the local filesystem(s) to be
located on the SAN instead, it's as simple as a symlink (as Bob indicated).

-g

RR wrote:
> Thanks Bob, that was my thought as well but just wasn't sure if that 
> was the best way to implement partitioning. I suppose I'm still a bit 
> not comfy with GFS considering I've never seen it in action but should 
> do in a few days time, as I'm starting to set up the cluster suite and GFS
now.
> 
> I'm assuming I still cannot use Logical Volumes on the cluster nodes 
> while the nodes are being used within a cluster in conjunction with 
> GFS? How do people provide for RAID1 type redundancy against system 
> boot-disk failure for each of their cluster nodes if I can't setup 
> software raid for these nodes? Do I run a cron job to sync up the two 
> drives within the system so in case of a drive failure, I can at least 
> boot the system using the secondary drive?
> 
> Thanks,
> RR
> 
> -----Original Message-----
> From: linux-cluster-bounces at redhat.com 
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Robert Peterson
> Sent: Thursday, June 22, 2006 4:46 AM
> To: linux clustering
> Subject: Re: [Linux-cluster] partitioning of filesystems in cluster 
> nodes
> 
> Hi RR,
> 
> For your the local root partitions on the individual nodes, it's 
> probably best to use ext3.
> On the SAN, use GFS and Red Hat Cluster Suite.  Then perhaps you can 
> create a symlink from your local node's mount point to the SAN, e.g. 
> from /mnt/gfs_san/var/spool to its local /var/spool.
> 
> Regards,
> 
> Bob Peterson
> Red Hat Cluster Suite
> 
> 
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