I think that's the point - the e-mail is using up all of the IOPs. There would be a small amount of IOPs left over that could deal with streaming data. The data

I think that's the point - the e-mail is using up all of the IOPs. There would be a small amount of IOPs left over that could deal with streaming data. The data is unlikely to be accessed on a regular basis. The data not used by e-mail would then be used for the archive - data that's pretty much write-only.