I've just acquired 6 15K, SAS drives which I'll be adding, as metadataOnly, to a file system that presently contains 6 SATA NSDs (dataAndMetadata) in the system pool. I'm hoping this might improve our poor metadata performance. My question is about the best way to make the change.
Would it be as simple as:
- create the NSDs for the 6 SAS drives
- add them to the filesystem as metadataOnly
- use mmchdisk to change the type of the 6 SATA NSDs to dataOnly
- restripe the filesystem?
Is that safe? Can the filesystem remain online while this happens (I'm aware that it'll be under-performing while running the restripe)?