|
Contents
- INDEX
- HP-UX Index
- Solaris
- Linux Index
- Other Unix types
- General Unix
- Unix Networking
- Unix Scripts
- Unix databases
Associated Information
- Unix Scripts Tips
Useful Links
-
Bash shell HOWTO
- Bourne Shell Man Page
-
C Shell Guide
- Korn Shell Resources
|
loadcheck.sh
<![CDATA[
#Step 1.
# sar -u <interval> <iterations>
sar -u 5 30 >/tmp/dsktest
# Is the %idle low? This is the percentage of time that the CPU is
# not running processes. Zero %idle over a sustained period could be
# the first indication of a CPU bottleneck.
#
# No -> The system is not CPU bound. Goto Step 3.
# Yes -> The system is possibly either CPU, memory, or IO bound.
# Goto Step 2.
#
#Step 2.
# Is %usr high? Many systems normally operate with 80% of the CPU
# time spent as user time, and 20% spent as system time. Other
# systems normally use more or less than 80% user time.
#
# No -> The system may be experiencing either a CPU, memory, or
# IO bottleneck. Goto Step 3.
# Yes -> The system is likely experiencing a CPU bottleneck due to
# user processes. Goto Section 3, Part A, Tuning a system
# with a CPU bottleneck.
#
# Step 3.
# Does %wio have a value > 15?
#
# Yes -> Keep this in mind later. It is an indication of possible
# disk or tape involvement in a bottleneck. Goto Step 4.
# No -> Goto Step 4.
#
# Step 4.
# sar -d <interval> <iterations>
sar -d 5 30 >>/tmp/dsktest
# Is %busy for any of the disks >50? (Remember, 50% is a rough guide,
# a better question would be is it much higher than normal for your
# system. On some systems even a %busy value of 20 may indicate
# a disk bottleneck, while others may normally have disks that
# are 50% busy.) For this same disk, is avwait > avserv?
#
# No -> Most likely no disk bottlenecks, go to Step 6.
# Yes -> There seems to be an IO bottleneck on this device. Goto Step 5.
#
# Step 5.
# There is a disk bottleneck on the system. What is on that
# bottlenecked disk?
#
# Raw Partitions,
# File Systems -> Goto Section 3, Part B, Tuning a system with
# a Disk IO bound system.
# Swap -> Possibly caused by a memory bottleneck. Goto Step 6.
#
#
# Step 6.
# vmstat <interval> <iterations>
vmstat 5 30 >>/tmp/dsktest
# Over sustained periods of time, is po > 0? Is (free * 4k) < 2 MB,
# for a s800 system (free * 4k < 1 MB for s700)? (The values 2 MB and
# 1 MB are rough guides, the actual value of LOTSFREE, the point at
# which a system begins paging, is calculated at system boot time and
# is based on the size of system memory.)
#
# No -> If, in step 1, %idle was low, the system is most likely CPU
# bound. Goto Section 3, Part A, Tuning a CPU bound system.
# If %idle was not low, there does not appear to be either a CPU,
# a disk io, or a memory bottleneck. Goto Section 4, Other
# Bottlenecks.
# Yes -> There is a memory bottleneck on the system.
pg /tmp/dsktest |more
#### END OF SCRIPT
]]>
|
