It's always been suggested to not run demanding workloads on any LUN created on a Vault drive RAID Group, even when they are 15k SAS.
The context being that doing so may impact performance. When you consider the performance capability of NL-SAS, I wouldn't be doing it. In fact I generally try and make a point of excluding any available user space on Vault drives into the overall capacity figure of an array.
I'm not aware of any official documentation or guidance on this though.
Thanks for your response - I am not looking to use the vault drives for any data other then the OE. I am coming from the thought that if you have a system that handles many operations, will the OE on a NL SAS disks have any performance issues?
Thanks dynamox - that is correct they are supported for all VNX models but are they any gotchas - as in things to watch out for etc
With no userdata loads I wouldn't expect any performance impact.
I don't think your info is correct. For VNX1, only the 5100, 5300 and 5500 support NL-SAS as vault drives, and for VNX2 only the 1TB drives are supported. Check the respective Storage Systems Disk and OE Matrix.
If you're not going to use the space, why are you considering the higher capacity drives....cost ?
i have not seen anything in terms of documentation/discussion that would suggest when to use or not to use NL-SAS for OE. On a Unified box your datamover LUNs will reside on those drives but it's not like you are rebooting your datamovers on daily bases or they are swapping like crazy. I personally prefer to get the smallest SAS drives possible for OE, fast rebuilds, smaller window of exposure.