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Re: [Linux-cluster] partitioning of filesystems in cluster nodes

No, I'm pretty sure what that's saying is that you can't build a GFS filesystem _on top of_ a software RAID volume. (Although you probably could, using GNDB ...) but unless I misunderstood you, you're talking about non-GFS filesystems on the local hard drives, with GFS on a SAN. This is a "standard" configuration, and certainly there's no reason you can't use software raid on the disks that will host non-GFS volumes. 

-g

RR wrote:

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 redhat com
[mailto:linux-cluster-bounces 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 redhat com [mailto:linux-cluster-bounces 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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