How to Uncover the secrets of Disk Latency

Application
Application
I/O
Subsystem
I/ONTFS.SYS
Subsystem
DMIO.SYS
File
System
PARTMGR.SYS
Volume
Manager
PHYSICAL DISK COUNTERS
Partition
Manager
DISK.SYS
STORPORT.CLASS Controller
SYS
Driver
PORT
Miniport
Disk Subsystem
Disk Subsystem
LOGICAL DISK COUNTERS
R
P
C
R
E
Q
U
E
S
T
S
STORE CACHE
T-Log
Buffer
E00.log
MailboxDB.EDB
VERSION
STORE
Name
Check
Action
Threshold
Version
ESE Database Hung ESE Checks for
I/O Detection
outstanding I/O
Generates a failure item in crimson
channel to restart the server
240 seconds
E14 SP1
System Disk
Heartbeat
Verifies server’s
system disk state
Sends an unbuffered I/O to system
disk; restarts server on heartbeat
time out
120 seconds
E14 SP1
Long I/O Times
I/O operation
latency
Restart the server
41 seconds
E15
System Event 129
(Bus Reset)
Check System log
for 129 Event
Restart the server
When event
occurs
E15
One Drive.
Storage Type
Recommendation
DAS
Reduce to 20 seconds if allowed by hardware
vendor.
SAN
Reduce to 20 seconds if allowed by hardware
vendor.
JBOD
Increase to 180 seconds if allowed by
hardware vendor.
Bytes per Sector
Bytes per Physical Sector
Drive Type
4096
4096
4K Native
512
4096
512e (Advanced
Format)
512
512
512 native
http://blogs.msdn.com/b/e7/archive/2009/05/05/supp
ort-and-q-a-for-solid-state-drives-and.aspx