When does the number of volumes per partition become problematic. Is it a function (as you imply above) of partition size, volume size (and distribution thereof), and number of volumes in the partition?
It becomes problematic when you need to vacate the disk because it's dying.
That's why we want to set it up on a RAID array, so individual disks can die and we can hot-swap them. Heaven forbid two drives die at once!
As for the IO-boundedness I would think that RAID will make the number of drives a moot point, or at least change the nature of the beast since, to AFS, all the drives will look like a single large drive.
Also, I should note, you can do a parallel salvage on partitions. If said does not become I/O bound, partitioning instead of "one big chunk" can be a win. I don't know offhand if it becomes I/O bound.
We will test different partition schemes and see if we can get extra servers for the cell.
Thanks for your insights! Leland
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