PERC H700 + ST4000DM005 = slow performance

Hello

I don't see an issue. 300 read and 150 write IOPS are higher than any benchmark or specification I can find on that drive. It is a 5900 RPM spindle drive in a parity RAID. You are using a low performance drive in a low performance RAID level, and you are getting better performance than the disks are rated. The increased performance is likely due to cache on the disks and/or controller.

Thanks

Thank you for the answer. So, using RAID10 can give me better performance. Or I can user faster disks finally.

RAID 10 is faster than RAID 5, but it may not be a big performance increase for you. You appear to be getting better performance than the drives are capable, so your best performance increase would likely be from better drives.

Switching to RAID 10 may allow the write cache to last longer before becoming full. The controller stages writes in cache while performing tasks like parity calculations or waiting for the disks to be ready to receive more data. While the controller is using write cache you can achieve write speeds far higher than the drives are capable. Once that cache fills up the speeds will slow down to what the drives are capable.

So, both will likely boost performance, faster drives will probably be the biggest increase in performance.

If you care enough about speed to even check the speeds, then you are using the wrong disks. 7200RPM disks at a minimum. SAS spinning at 10K/15K would be better. SSD would be ideal. Getting drives with rotational speeds of 4900-5900RPM means you don't care about performance.