tra [ ] parametri opzionali

Comandi di monitoraggio risorse e prestazioni

hdparm [opzioni] deviceimpostazione parametri hd e monitoraggio prestazioni opzioni principali

-t, -T prestazioni lettura hdesempio hdparam –Tt /dev/sda

iostat [opzioni] [device] [intervallo]monitoraggio utlizzo della CPU e prestazioni hd a intervalli specificati da intervallo, o una sola volata se intervallo non è specificatoopzioni principali

-k, -m visualizzazione in KB, MB-x statistiche estese

esempio iostat –mx /dev/sda 3 visualizza le statistiche estese in MB di sda ogni 3 secondi

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ps

vmstat [opzioni] [intervallo]informazioni sulla memoria, processi, paginazione, a intervalli specificati da intervallo, o una sola volata se intervallo non è specificatoopzioni principali

-s altre statistiche-d statistiche sui dischi-S unità di misura (k o m)

netstatstatistiche sulle interfacce di reteesempio netstat –i 3 visualizza le statistiche ogni 3 secondi

cat /proc/cpuinfoinformazioni sul processore

fdisk –l | grep Diskcapacità dei dischi

ksar is a java program for viewing sar output in graphical format

1. Launching kSar1. Windows & Mac os X:

The simplest way is too double-click on the kSar-x.x.x.jar2. Command line (unix & other):

You need a functional java installation and launch : java -jar kSar-x.x.x.jar

2. Grabbing statistics1. Using a local text file of a sar output:

This will parser a output text file of the sar command. you need to have a special precaution to make this file, since the parser is not locale time aware.

The parser is waiting for C locale output fileeg. : LC_ALL=C sar -A > mysar22.txt

3. Managing graphs1. Interactive zooming:

Using the move, you can interactively zoom onto up a part of a graph. To select a zone to zoom, click on the upper left conner and while still holding the mouse button move to the lower-right of the zone you want to zoom

sar Collect, report, or save system activity information.richide sysstat

sar examples

To view real-time reporting about CPU utilization # sar -u 3 10Where,¦3 = interval¦10 = count

To view process creation statistics, enter: # sar -c 3 10

To view I/O and transfer rate statistics, enter: # sar -b 3 10

To view paging statistics, enter: # sar -B 3 10

To view block device statistics, enter: # sar -d 3 10

To view statistics for all interrupt statistics, enter: # sar -I XALL 3 10

To view device specific network statistics, enter: # sar -n DEV 3 10 # sar -n EDEV 3 10

To view CPU specific statistics, enter: # sar -P ALL # Only 1st CPU stats # sar -P 1 3 10

To view queue length and load averages statistics, enter: # sar -q 3 10

To view memory and swap space utilization statistics, enter: # sar -r 3 10 # sar -R 3 10

To view status of inode, file and other kernel tables statistics, enter: # sar -v 3 10

To view system switching activity statistics, enter: # sar -w 3 10

To view swapping statistics, enter: # sar -W 3 10

To view statistics for a given process called Apache with PID # 3256, enter: # sar -x 3256 3 10

solitamnete i dati vengono memorizzati in files per giornate in /var/log/saper vedere i dati di un particolare file

# sar -A -f /var/log/sa/saxx