The Simpletech 250GB external drive I have here is very noisy, so I got a Seagate 500GB to replace it. I plugged the new drive in and I can now click "Remove" to take the 250GB drive out of the pool. The 1TB disc you see in the screenshot is a Maxtor OneTouch 1TB external drive.
As it is now, my Windows Home Server is currently managing 1.7 TB (terabytes) of disc space, soon to be reduced to 1.5 TB.
Any file on the 250GB drive will be relocated to the other storage, and when the drive is empty I get a message telling me it's ok to remove it. Since it is a USB drive I can do this with the server running - I added the 500GB with the server up and didn't have to stop to add it to the pool.
Windows Home Server works by creating a 20 GB system partition on your primary drive, and the rest of the disc is used to store files. If you have more than one drive, the other drives can be used for storage and you can enable "duplication" for shared folders.
Duplication ensures files are copied to different drives so that you have a copy in the case of a disc drive fault affecting one of the units. It's almost like mirroring, but it's at folder level.
When a file is copied to the server it will land into the data partition on your primary drive, and over time it will be moved out to make space for new files. After being moved out a special pointer ("tombstone") is created in the data partition, pointing to the actual file in the storage pool.
The "balancing" operation moves the files out of the data partition into the pool and makes sure duplication is happening.
Of course you don't have to know this at all. You just have to use it, set duplication for some folders and the rest is automatic.
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