On 2012-11-13 17:42, Peter Tribble wrote:
> Given storage provisioned off a SAN (I know, but sometimes that's > what you have to work with), what's the best way to expand a pool? > > Specifically, I can either grow existing LUNs, a]or add new LUNs. > > As an example, If I have 24x 2TB LUNs, and wish to double the > size of the pool, is it better to add 24 additional 2TB LUNs, or > get each of the existing LUNs expanded to 4TB each? This is only my opinion, but I would say you'd be better off expanding your current LUNs. The reason for this is balance. Currently, your data should be spread fairly evenly over the LUNs. If you add more, those will be empty, which will affect how data is written (data will try to go to those first). If you just expand your current LUNs, the data will remain balanced, and ZFS will just use the additional space. I _think _that's how it would work. Others here will be able to give a more definitive answer.
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