I have seen a number of presentations about the usage of PAM II to reduce the need for SAS or FC disk. Is there any real guidelines available or documentation to justify sizing?
Generally I want to be able to size two specs, one with PAM one without and price them out for my customers.
Thanks in advance for any help!
TR-3744 does give some real world numbers (albeit with the original 16 GB PAM).
In short, the performance of "224 15k FC disks" = "112 15k FC disks + PAM I" = "112 7200 RPM SATA + PAM I".
Pretty cool stuff....
Thanks Andew, for pointing this out.
There is also TR-3766 (http://media.netapp.com/documents/tr-3766.pdf) on PAM I and Exchange 2007. I expect Flash Cache (PAM II) will do even better because of large cache size.