Mark D. Foster wrote:
Paul Heinlein wrote:
On Tue, 18 Sep 2007, Flaherty, Patrick wrote:
If I had the time, I'd like to try using Xen with an
OpenSolaris ZFS
iSCSI target as shared storage, but alas I do not have that time.
FWIW, I've had good luck compiling and running the iSCSI target from http://iscsitarget.sourceforge.net/ on CentOS 5. There
aren't all the
bells and whistles of ZFS, I suppose, but it's pretty simple to set up. Also, given gigabit ethernet and a decent switch, its bonnie++ numbers aren't bad at all.
Apples and oranges, though. iSCSI is networked block storage. It does not case what filesystem you lay on it. As someone who learned this the hard way, it is not enough to have iSCSI to support live vm migration. If you are look to setup 2+ xen hosts and live migrate amongst them (known as vmotion in vmware-land) you need _shared_ storage filesystem, and ext3 is not that nor is zfs. See http://en.wikipedia.org/wiki/List_of_file_systems#Shared_disk_ file_systems for a list of FS that would suitable to lay on iSCSI for this purpose.
There is a configuration though that doesn't need a cluster file system to perform live migrations and that is where the Xen VMs write directly to a block device which is an iSCSI target.
-Ross
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