Hi guys, i''m newbie in xen and i''m studying it for my stage at
university. i successfully installed xen 3.0.3 on red hat es 4 on a
couple of server. now i have a question. i have a san EMC Clariion
attached to them with a fiber channel switch and i would like to use
that as shared storage for testing live migration, and all features of
xen systems. linux systems recognize SAN as sda device and then i can
mount it normally. what type of FS may i use to grant concurrency
access and consistency to san for both servers? i tried to format in a
normal ext3 fs, but when i act changes with server A, server B must
umount and remount partition to see that changes, and it doesn''t
recognized the owner, group and permission of that file. could u help
me to follow a right procedure to prepare san for my test?
I saw some emails that speak about nfs, Aoe, Gfs, clvm, but i think in
that way i need to have a daemon server, like nfs, that manage access.
there are aternatives?
Thanx for all
Regards
nicola
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On Sat, 2006-11-18 at 04:49 -0800, krabbit@autistici.org wrote:> what type of FS may i use to grant concurrency > access and consistency to san for both servers?You need a cluster file system that syncs access across many machines, so no 2 machines try to allocate the same group of inodes and end up making a mess. You can mount an ext3 file system read only from as many places as you like... if it remains completely static. Any changes will result in all mounts of that file system being different, any writes thereafter from a remote node will corrupt it.> i tried to format in a > normal ext3 fs, but when i act changes with server A, server B must > umount and remount partition to see that changes, and it doesn''t > recognized the owner, group and permission of that file. could u help > me to follow a right procedure to prepare san for my test?For what you want, I recommend ocfs2. Your kernel has modular support for it. Get the ocfs2 tools via yum (not sure if available?) or at oracle''s site - http://oss.oracle.com/projects/ocfs2/> I saw some emails that speak about nfs, Aoe, Gfs, clvm, but i think in > that way i need to have a daemon server, like nfs, that manage access. > there are aternatives?ocfs2 is very easy, just install the tools, create your cluster config file (simple plain text) and start the cluster service. Make your shared file system type ocfs2 (mkfs.ocfs2). You can use the console dev that comes with ocfs2 tools to propagate cluster changes to every node and simplify managing it.. or just use some kind of simple key pair setup and script to keep all cluster.conf''s in sync. Its a little easier to manage for your purposes but suitable for production too. Would be neat for you to post some benchmarks to the list with regards to dom-u performance over your FC storage network .. and type of gear you used :) helps others when deciding how to plan something similar.> Thanx for all > Regards > nicola >Best, -Tim> _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Sat, Nov 18, 2006 at 04:49:12AM -0800, krabbit@autistici.org wrote:> Hi guys, i''m newbie in xen and i''m studying it for my stage at > university. i successfully installed xen 3.0.3 on red hat es 4 on a > couple of server. now i have a question. i have a san EMC Clariion > attached to them with a fiber channel switch and i would like to use > that as shared storage for testing live migration, and all features of > xen systems. linux systems recognize SAN as sda device and then i can > mount it normally. what type of FS may i use to grant concurrency > access and consistency to san for both servers? i tried to format in a > normal ext3 fs, but when i act changes with server A, server B must > umount and remount partition to see that changes, and it doesn''t > recognized the owner, group and permission of that file. could u help > me to follow a right procedure to prepare san for my test? > I saw some emails that speak about nfs, Aoe, Gfs, clvm, but i think in > that way i need to have a daemon server, like nfs, that manage access. > there are aternatives? > Thanx for allCLVM would be a good choise for creating LVM volumes on a shared storage. - Pasi> Regards > nicola >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users