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After all the theory about VSift in my previous blog posts now a tip about how to tune VSIFT. Before I continue first this. VSift is not a bad technology but the implementation in NAV has one big downside. The good old SIFT levels have disapeared. In older versions of NAV there was a SIFT Level property...
With the introduction of VSIFT, a new perception was introduced. There are no more Zero SIFT records. More about VSift in http://dynamicsuser.net/blogs/mark_brummel/archive/2009/04/12/vsift-the-day-after.aspx With the classic SIFT it was possible to have SIFT records that did not contain any totals....
Some time ago a new technology for SIFT was introduced. SIFT is a technology that makes it possible in NAV to use the flowfields with the powerfull flowfilter technology. It stands for Sum Index Flow Techology. In the classic database the flowfield data was kept at index level. SQL does not have these...
As promised I have some results from the tests. So we compared HP ML 370 with 14 SAS disks dedicated to a HP DL380 with data on a HP MSA2000 SAS SAN running on VMWare with the same amounts of disks. The DL380 is running on VMWare. The OS is on a shared storrage with the OS of the other VMWare machines...