I just installed a 24 disk SATA shelf. I was unaware we ordered 7500RPM SATA disks. Our other shelves are SAS and FC at 15000RPM and 10000RPM respectively. I created a new aggregate for the SATA disks as to not mix them. However I am concerned how well these disks will perorm. I had planned on using them for Exchange 2013 databases as well as storage for the system drives for Hyper-V servers. Should I be concerned?
This shelf is on an FAS3240 with OnTap8.2.2 7-mode
Can someone confirm what Hariprak says about mixed disk will slow everything on that controller? If this is true, this is worse than I thought, which is it will only slow any aggregate with mixed disks.
Sata Disk should be fine for Exchange 2013 and some low end VM's. You should be careful for OS partition on slow storage with Windows servers as slow OS partition can affect system and application performance.
Also carefully test deduplication, compression, snapshots and snapmirror as they all produce additional internal io.
With flashcache cards you should be fine, as they make a hugh difference with slow drives on NetApp. Random reads do really hurt sata drives.
Especially as your io budget with 24 sata drives is not that high.
what Hariprak is saying is correct. Ideally SAS and SATA should not be mixed on the same controller but this is not always acheiveable. When data hits the controller it is sorted in RAM \ NVRAM by aggregate (chain) and then flushed to each aggregate at the same time (consistency point). If the SATA aggregate (or the SAS aggregate) cannot stripe to all the disks before NVRAM fills up again (or within 10 seconds) you will have performance issues (back to back consistency points). You could try and move some low IOPs data to the new SATA aggregate (CIFS is generally low IO)