Jetstress: Performance characteristic is more realistic when 80% of the disk capacity is utilized.

Some tests showed that using 70% or 80% of the disk capacity can show the realistic performance characteristic. The achieved IO is up to 100% more than what you can really get when 80% of the disk is utilized in terms of its capacity. Refer to a TechNet traing session slide: http://download.microsoft.com/documents/uk/technet/learning/downloads/evenings/Exchange_2003_Storage_Design_Brad_Carter_14th_July.ppt This posting is…

0

JetStress (WR2.1): There has been confusion about sizing test database.

JetStress (WR 1.2: 06.05.7529.0) — Calculation is like the following: Planned Data: 750 users * 200 MB = 150 GB. Initial Data: 150 GB * 75% = 112.5 GB. Initial EDB: 112.5 GB * 1.67% = approximately 188 GB — 112.5 GB mailbox data + 66% overhead. Required space (which is double the initial data)…

0

JetStress (WR2.1) uses Database Page Fault Stall Per Sec.

JetStress (WR2.1) uses Database Page Fault Stalls Per Sec instead of Database disk write latency. It’s mainly because it could handle SRDF/sync environment. In SRDF/sync environment, database disk write latency can go over 20 ms on average, but it is not necessarily causing users to experience performance problems. However, in a non-replicated environment, if the database write…

0