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Re: [Xen-users] Shared Storage

Hands down mamanging LVM is my number one choice. Ideally I would just
like to set up the iSCSI connections once and just leave it

Yeah. iSCSI a few LUNs from your SAN, cLVM across your nodes (do the iSCSI in dom0), create your LV's and you're done.

This is really only half the picture though and touches on another level of storage concepts. What does your backend disk and cache look like? In my clusters, I create two storage pools, one for "fast disk" and the other for "slow disk," then add LUNs from the SAN appropriately. You should get as granular as you can in performance and use-case terms though to keep the right IOs on the right disks but that may not be practical with your SAN (e.g., if you just have 64 spindles in a single RAID-10 or some dumb JBOD or something).

I guess the message is to think about how you're laying out your data and then align that with how you lay out your disks. You may squeeze out an extra 5% by going with multiple LUNs versus a single LUN and another 30% by going with FC instead of multi-GbE, but you can gain even more by utilizing the limited i/o of a spindle more effectively.


John Madden
Sr UNIX Systems Engineer / Office of Technology
Ivy Tech Community College of Indiana

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