I am planning to my SQL server databases (plus TLogs and TempDB) to a new LUN on our iSCSI SAN.  The current LUN's used by these of these files are on their own two disk RAID 1 disk group and I'm going to a larger but shared 14 disk RAID 10 disk group.  I want to measure the performance of the current configuration and the new configuration as I move each database over and ensure that I am not starting to hit any disk performance issues (or see if I am actually increasing the performance).

There are a bunch of posts on the internet on SQL performance counters such as this one, but I am really interested in just the few that are related to network/disk usage and any latency or limits that associated with disk reads/writes.  What are some of the important SQL or Windows performance counters that I should look at to create a current baseline/comparison for iSCSI disk access for SQL?


Question: Chords Built On Different Scales
Answer: You can build chords on any scale. You would build chords the same way you build them in the typical major and minor scales. You would take a root note of any scale degree and add the 3rd above the root and the 5th above the root and you get your chord.

I'll use the example you've given that is based on the different minors. 

In A natural minor you have the following notes:


A, B, C, D, E, F, G


If you were to build chords from each note you would have the following chords: 


Am      - (A,C,E)
Bdim    - (B,D,F)
C       - (C,E,G)
Dm      - (D,F,A)
Em      - (E,G,B)
F       - (F,A,C)
G       - (G,B,D)


In A harmonic minor you have the following notes:


A, B, C, D, E, F, G#


If you were to build chords from each note you would have the following chords: 


Am      - (A,C,E)
Bdim    - (B,D,F)
C+      - (C,E,G#)
Dm      - (D,F,A)
E       - (E,G#,B)
F       - (F,A,C)
G#dim   - (G#,B,D)


In A melodic minor (ascending) you have the following notes:


A, B, C, D, E, F#, G#


If you were to build chords from each note you would have the following chords: 


Am     - (A,C,E)
Bm     - (B,D,F#)
C+     - (C,E,G#)
D      - (D,F#,A)
E      - (E,G#,B)
F#dim  - (F#,A,C)
G#dim  - (G#,B,D)


As you can see there is a very simple method to building chords that you can apply to any scale.