We have been in the process of researching different servers, and in this process several sales have told us the following: There is really no perforamnce increase going to 15k that justifies the cost, and that 10k vs 15k benchmark difference is neglible.
In our existing DL380 we have a mix of one array being 15k and a second array with midline 7200k drives. The performance is amazingly noticeable. I would like to hear from some real world users rather than sales whether there is a benefit to going with 15k 2.5" SAS vs 10K 2.5" SAS
The purpose of these servers are to run ESXi with a RAID 10 array holding the datastores. We don't need a gazillion terabytes of storage, but do need cost effective performance (stress cost as we have already excluded SSDs as too expensive). We are currently looking at DL380 G10