I’m working as sys admin on a db server that’s currently serviced by 30x 15k disks and is getting about 3000-3500 iops. A consultant has suggested we can replace that with 10x 10k disks and 700g of flash. He has not performed any testing to determine the working set, growth patterns, etc… and I find the suggestion a little hard to comprehend. For what it’s worth, he’s not a DB storage specialist, rather a generalist.

I’m looking for any information from Oracle or EMC on the ratio between the flash tier and the disk tier. Note, ASM and ZFS are not being used in this case, the array will do the tiering in 1g block chunks